+

WO2018186530A1 - Appareil pour éliminer un bruit d'alimentation, et appareil pour convertir un signal audio - Google Patents

Appareil pour éliminer un bruit d'alimentation, et appareil pour convertir un signal audio Download PDF

Info

Publication number
WO2018186530A1
WO2018186530A1 PCT/KR2017/006096 KR2017006096W WO2018186530A1 WO 2018186530 A1 WO2018186530 A1 WO 2018186530A1 KR 2017006096 W KR2017006096 W KR 2017006096W WO 2018186530 A1 WO2018186530 A1 WO 2018186530A1
Authority
WO
WIPO (PCT)
Prior art keywords
audio signal
unit
noise
noise removing
removing unit
Prior art date
Application number
PCT/KR2017/006096
Other languages
English (en)
Korean (ko)
Inventor
이정호
유승호
안지헌
김우석
Original Assignee
주식회사 아이리버
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020170072615A external-priority patent/KR102283540B1/ko
Application filed by 주식회사 아이리버 filed Critical 주식회사 아이리버
Priority to US16/500,784 priority Critical patent/US10819304B2/en
Publication of WO2018186530A1 publication Critical patent/WO2018186530A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the technical field to which this embodiment belongs is directed to an apparatus for removing noise components introduced from a power source in an audio system.
  • An audio system is a system in which an electric signal converted from sound waves and sound waves in a human sound range, such as music, human voice, and natural sound, is converted into sound wave energy and radiated into space.
  • Hi-Fi audio is a sound device that can reproduce uniformly and close to the original sound from the low end to the high end of the human audio frequency range of 16 Hz to 20 kHz.
  • Hi-fi audio is very sensitive to noise. It is especially vulnerable to power line noise coming from the power source. That is, there is a problem that the quality of the audio signal is degraded due to power line noise.
  • Embodiments of the present invention provide a noise canceling unit in which an apparatus for converting an audio signal for reproducing hi-fi audio has a step-by-step operation, a muting unit implemented by a pair of FETs, and a spaced wiring structure, thereby reducing power supply noise. Its main purpose is to effectively eliminate it.
  • removing the noise component introduced from the power supply terminal of the audio signal conversion step by step includes a noise removing unit for transferring power from the power supply terminal to the converter and amplification unit included in the audio signal conversion device
  • a power supply noise canceling device is provided.
  • the power supply terminal is separated into a plurality, and the noise removing unit is provided in plurality, and the plurality of noise removing units are respectively connected to the plurality of separated power supply terminals to individually remove the noise component.
  • a first noise canceller is connected between the converting unit and the first power supply terminal, and a second noise canceller is connected between the amplifier and the second power supply terminal.
  • the noise removing unit includes a primary noise removing unit connected to a voltage input node, a secondary noise removing unit connected to the primary noise removing unit, a third noise removing unit connected to the secondary noise removing unit, and the third noise removing unit And a voltage output node connected to the fourth order noise canceller.
  • the primary noise removing unit uses beads for removing high frequency noise.
  • the secondary noise canceling unit uses a capacitor having a series equivalent resistance value lower than a preset value.
  • the third noise canceling unit uses a low drop out (LDO) regulator.
  • the fourth noise canceling unit uses a large capacity capacitor larger than a preset value.
  • a power supply terminal a converting unit converting a digital audio signal into an analog audio signal, and an operation timing for converting the digital audio signal into the analog audio signal based on the digital audio signal. Step by removing the clock generator for determining, the amplifier for amplifying the analog audio signal, and the noise component flowing from the power terminal to transfer the power from the power terminal to the clock generator, the converting unit and the amplifier.
  • An audio signal converting apparatus including a noise removing unit is provided.
  • the audio signal conversion device is implemented in a modular manner, and is configured to be coupled to an audio signal reproduction device.
  • the apparatus for converting audio signals may include: a first muting processor configured to mute an audio signal when a negative pop noise exists based on a preset timing; And a muting unit including a second muting processing unit to mute the audio signal at a time when positive pop noise exists based on the timing.
  • power is transferred from the power terminal to the converting unit and the amplifying unit included in the audio signal converter by gradually removing noise components introduced from the power terminal of the audio signal converter. By transmitting, there is an effect that can remove power supply noise.
  • FIG. 1 is a diagram illustrating an audio system according to embodiments of the present invention.
  • FIG. 2 is a block diagram illustrating an audio signal reproducing apparatus according to an embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 4 is a perspective view illustrating an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a connection of the audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating an audio signal conversion apparatus according to another embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a signal flow of an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a noise removing unit of an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIGS. 9 and 10 illustrate synchronizing clocks between an audio signal converting apparatus and an audio signal reproducing apparatus according to embodiments of the present invention.
  • FIG. 11 is a diagram illustrating a converting unit of an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 12 is a diagram illustrating an amplifier of an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 13 is a diagram illustrating wiring of an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 14 is a block diagram illustrating a mute unit of an audio signal conversion apparatus according to an embodiment of the present invention.
  • 15 is a circuit diagram illustrating in detail a mute unit of an audio signal conversion apparatus according to an embodiment of the present invention.
  • FIG. 1 is a diagram illustrating an audio system according to embodiments of the present invention.
  • the audio system 100 includes an audio signal reproducing apparatus 200 and an audio signal converting apparatus 300.
  • the audio signal reproducing apparatus 200 and the audio signal converting apparatus 300 are electrically connected to each other.
  • the audio signal reproducing apparatus 200 performs a function of reproducing an audio signal.
  • Examples of the audio signal reproducing apparatus 200 may include a personal computer, a video player, a smartphone, an MP3 player, and an audio device inside a vehicle battlefield.
  • the audio signal converter 300 converts an audio signal from a digital signal to an analog signal.
  • the audio signal converting apparatus 300 receives an audio signal in the form of a digital signal from the audio signal reproducing apparatus 200, converts the audio signal into an analog signal form, and transmits the audio signal to the audio signal reproducing apparatus 200.
  • the audio signal converting apparatus 300 contributes to the audio signal reproducing apparatus 200 outputting a high quality sound source by reproducing digital content. That is, the audio signal conversion device 300 may be implemented as a hifi audio module.
  • the way to determine the sound quality of an audio file is to look at the bit rate. This can be measured in kilobits per second.
  • the bit rate of the CD sound source is 1411 kbps, and as the bit rate is higher, a high quality analog signal can be output.
  • the bit rate may be set according to the sound quality of the sound source data.
  • the sound source data can mainly use 128 kbps, 256 kbps, and recently, lossless sound sources can vary depending on the capacity of the song itself.
  • FIG. 2 is a block diagram illustrating an audio signal reproducing apparatus according to an embodiment of the present invention.
  • the audio signal reproducing apparatus 200 may include a signal processor 210, a signal storage unit 220, a signal output unit 230, an information display unit 240, a power supply unit 250, and a connection unit 260. Include all or part of it.
  • the audio signal reproducing apparatus 200 may omit some of the various components illustrated in FIG. 2 or may further include other components.
  • the signal processor 210 instructs the audio signal stored in the signal storage unit 220 to be transmitted to the audio signal converting apparatus 300, receives the converted audio signal in the audio signal converting apparatus 300, and outputs a signal.
  • the converted audio signal is output to the unit 230.
  • the signal processor 210 may be implemented as a microprocessor.
  • the signal storage unit 220 stores the audio signal.
  • the signal storage unit 220 may be implemented as a memory, a hard disk drive, or a solid state drive.
  • the signal storage unit 220 may be fixed in the audio signal reproducing apparatus 200 or may be implemented in a detachable manner such as a portable drive.
  • the information display unit 240 outputs the information calculated by the signal processor 210 as visual information.
  • the information display unit 240 may display a playlist of the audio signal reproducing apparatus 200 or an artist list of digital content.
  • FIG. 3 is a block diagram illustrating an audio signal conversion apparatus according to an embodiment of the present invention.
  • the audio signal converting apparatus 300 includes a power supply terminal 310, a noise removing unit 320, a clock generator 330, a converting unit 340, an amplifier 350, and a mute unit 360. ), And all or part of the connection portion 370.
  • the apparatus 300 for converting audio signals may omit some components from among the various components illustrated in FIG. 3 or may further include other components.
  • the arrangement of the clock generator 330, the converting unit 340, the amplifier 350, and the mute unit 360 in the audio signal conversion apparatus 300 may be arbitrarily changed according to the purpose of noise reduction. .
  • the position and connection relationship of the clock generator 330, the converting unit 340, the amplifier 350, and the muting unit 360 in the audio signal conversion device 300 are optimized for the flow of data or signals. It may have a structure.
  • the layout and design of the audio signal converter 300 may be set using hardware or software. In changing the components of the audio signal conversion apparatus 300, it may be necessary to initialize the flow of data or signals, and the initialization may be performed by a module embedded in the hardware itself or by software that can be received by a separate internet or mobile app. Can be set automatically.
  • the audio signal conversion apparatus 300 may have a high current consumption to contribute to the audio signal reproducing apparatus 200 outputting a high quality sound source.
  • the audio signal converting apparatus 300 may control the converting unit 340 and the amplifying unit 350 separately to minimize the current consumption according to the use.
  • the audio signal converting apparatus 300 may be implemented in a modular form. Users can easily change, replace, upgrade, etc. the modular audio signal conversion apparatus 300, so that the user can easily change the audio system 100 to meet the needs of the user. General users who use the modular audio signal converter 300 or a manufacturer who wants to enhance the audio, home appliances, and electrical equipment can be tuned to the audio signal converter 300 at a low cost, and having an audio system 100 of various lineups. You can enjoy the same effect.
  • the audio signal converting apparatus 300 may have a shape detachable to the audio signal reproducing apparatus 200 and may be mounted on the audio signal reproducing apparatus 200.
  • the audio signal converter 300 receives the audio signal stored in the audio signal reproducing apparatus 200 and processes the audio signal according to the synchronized clock.
  • the audio signal converting apparatus 300 and the audio signal reproducing apparatus 200 each include a connecting portion that can be electrically contacted.
  • the audio signal is transmitted / received via wire / wireless connection between the audio signal converting apparatus 300 and the audio signal reproducing apparatus 200.
  • FIG. 4 is a perspective view illustrating an audio signal conversion apparatus according to an embodiment of the present invention.
  • the audio signal conversion apparatus 400 includes a housing 480 and a shield can 490.
  • the housing 480 is located outside at least one of the clock generator 430, the converting unit 440, the amplifying unit 450, and the muting unit 360, and functions to fix the devices.
  • the shield can 490 serves to prevent the inflow of radiation noise.
  • the material of the shield can 490 may be a material including at least one of silver or stainless steel.
  • the shield can 490 may be formed to be detachable from the housing 480.
  • the housing 480 is formed such that at least a portion of the connection part 470 is exposed to the outside so that the audio signal conversion device 400 may be in electrical contact with the external audio signal reproducing apparatus 200.
  • the audio signal converter 400 transmits and receives an electrical signal to and from the audio signal reproducing apparatus 200 using the connection unit 470. That is, the connection portion 470 is a passage of the electric signal.
  • the connection part 470 includes a fastening part 472 and an electrode 474.
  • the audio signal converting apparatus 400 may be mechanically mounted to the audio signal reproducing apparatus 200 using the fastening unit 472.
  • the fastening part 472 may include a connector of a standardized standard. It may have a fastening structure using a magnetic force for the user's convenience.
  • the audio signal conversion apparatus 400 may transmit a clock signal to the signal processing unit 210 of the audio signal reproducing apparatus 200 through the connection unit 200 and receive a control signal from the signal processing unit 210.
  • the connection part 470 may include an insulating material to prevent the electrical signal from flowing into the air or the user's body. The structure and shape of the connection unit 470 may be changed according to the purpose and shape of the audio signal reproducing apparatus 200.
  • FIG. 5 is a diagram illustrating a connection of the audio signal conversion apparatus according to an embodiment of the present invention.
  • the electrode 574 of the connector 570 may include a guide shaft 576 which is operated by a spring and a guide hole 578 that may transmit an electrical signal to the inside of the guide shaft 576.
  • the guide ball 244 When the guide ball 244 is pressed with a force greater than the elastic force of the spring, the guide ball 244 may contact the connection part 260 of the audio signal reproducing apparatus 200.
  • the structure of the electrode 574 may have a form similar to that of the pogo pin structure.
  • the audio signal converting apparatus 300 checks whether the audio signal converting apparatus 300 is in electrical contact with the audio signal reproducing apparatus 200.
  • the audio signal converting apparatus 300 may check whether the audio signal converting apparatus 300 normally contacts the external audio signal reproducing apparatus 200 using the contact signal and the received signal.
  • the contact signal is a signal for notifying the audio signal reproducing apparatus 200 that the audio signal converting apparatus 300 has normally contacted.
  • the received signal is a communication signal received by the external audio signal reproducing apparatus 200 that can communicate.
  • the signal notifies the audio signal converting apparatus 300 that the audio signal is ready to be transmitted.
  • the audio signal converter 300 may receive an audio signal when the audio signal reproducing apparatus 200 normally contacts the audio signal reproducing apparatus 200.
  • the size of the modular audio signal conversion device may be between 7 mm and 30 mm.
  • the size of the modular audio signal conversion apparatus is changed according to the required design, and may vary according to the specification of the connection portion of the audio signal reproducing apparatus 200.
  • FIG. 6 is a diagram illustrating an audio signal conversion apparatus according to another embodiment of the present invention.
  • the audio signal converter 300 may not only modularize the device itself, but also modularize internal components thereof.
  • the audio signal converter 600 may detach the converting unit 630 and the amplifying unit 640 from the base module 610. Through the modularization of internal components of the audio signal conversion apparatus 600, the playback sound quality of various digital contents may be selected.
  • FIG. 7 is a diagram illustrating a signal flow of an audio signal conversion apparatus according to an embodiment of the present invention.
  • Power supply noise is classified into harmonic noise, pulse noise, and surge noise according to voltage level or waveform.
  • Harmonic noise is a harmonic component mainly included in a switching frequency of a computer or a switching power supply, and has a voltage level of several mV to several tens of mV, and is always generated when an electric device is turned on or off.
  • Pulsed noise is noise generated during switching of relays or induction motors, and the voltage level is higher than that of harmonic noise, and the peak voltage may reach thousands of volts.
  • Surge noise is mainly generated in the power line by induced lightning, and the voltage level is extremely high compared to other noises, and the peak voltage may reach tens of thousands of volts.
  • the audio signal converting apparatus has a noise removing unit operating stepwise, a muting unit implemented by a pair of FETs, and a spaced wiring structure to remove power supply noise.
  • an audio signal converter includes a power supply terminal 710, a plurality of noise removing units 721 to 724, a clock generator 730, a converting unit 740, an amplifier 750, and a muting unit ( 760, and a connector 770.
  • the power terminal 710 serves to supply electrical energy to the clock generator 730, the converting unit 740, the amplifier 750, and the mute unit 760.
  • a power source is connected to the power terminal 710, and the power source may be located inside or outside the audio signal converter. The type of power source may be changed according to the characteristics of the audio signal reproducing apparatus.
  • the power supply terminal 710 may be separated into a plurality. The plurality of separated power terminals may have optimized voltage values.
  • the plurality of noise removing units removes noise introduced from the power supply terminal 710.
  • the noise removing units 721 to 724 include (i) a single or a plurality of power supply terminals 710 and (ii) a clock generator 730, a converting unit 740, an amplifier 750, And a mute portion 760 are individually connected.
  • the clock generator 730 generates a clock signal that determines an operation timing of the audio signal converter 300.
  • the clock generator 730 may generate a master clock (MCLK), a left-right clock (LRCK), a bit clock (BITCLK), and the like.
  • MCLK stands for master clock.
  • the clock generator 420 may determine a final operation timing of the audio signal converter using MCLK.
  • LRCK refers to the clock for the L (Left) and R (Right) channels of the digital audio signal. It may be set to 1 when the L channel information is transmitted, and may be set to 0 when the R channel information is transmitted.
  • BITCLK refers to a clock transmitted by engaging a bit that is the basis of a digital signal.
  • the clock generator 730 may determine whether the digital signal is 0 or 1 by synchronizing with the bit clock using the BITCLK.
  • Clock signals generated by the clock generator 730 are transmitted to the audio signal reproducing apparatus through the connector 770.
  • the clock generator 730 may accurately generate an analog signal because the clock generator 730 uses a clock generated by a phase locked loop (PLL).
  • the audio signal conversion apparatus 300 may generate an analog signal having low jitter by directly making and using a clock through the clock generator 730.
  • the converting unit 740 converts the digital signal received from the audio signal reproducing apparatus 200 through the connection unit 770 into an analog signal using the synchronized control signal and the clock signals.
  • the converting unit 740 may be implemented with a plurality of modules. In this case, the converting unit 740 can convert a high quality analog signal through averaging of output noise. However, when the converting unit 740 is implemented with a plurality of modules, the consumption current may be increased. This problem may be solved by individually controlling the current of the converting unit 740.
  • the amplifier 750 amplifies an analog signal which is an output of the converting unit 740.
  • the amplifier 750 may include a pre-amp for controlling an analog signal and a power-amp for amplifying power, and an integrated amplifier in which the pre-amp and the power amplifier are combined. It is also possible to implement However, the shape of the amplifier 750 in the present embodiment is not limited thereto, and may be arbitrarily changed according to the purpose and function of the audio signal converter 300.
  • the muting unit 760 mutes the audio signal based on a predetermined timing.
  • the mute unit 760 removes pop noise generated when the power supply is turned on and off after the audio signal converter 300 is mounted on the audio signal reproducing apparatus 200.
  • connection unit 770 electrically or mechanically connects the audio signal converting apparatus 300 to the audio signal reproducing apparatus 200, and serves as a path of an electrical signal between the audio signal converting apparatus 300 and the audio signal reproducing apparatus 200. Perform.
  • the connector 770 receives the audio signal from the audio signal reproducing apparatus 200 and transmits the audio signal to the converting unit 740.
  • the noise removing unit removes the noise flowing from the power terminal.
  • the internal circuits of the noise removing units 130, 150, and 170 may include a voltage input node 172, a bead 820, a first capacitor 830, a low drop out (LDO) regulator 840, and a second capacitor ( 850, and a voltage output node 860.
  • LDO low drop out
  • the noise removing unit may have a circuit structure in which electrical elements are sequentially connected.
  • the circuit structure of the noise canceling unit uses a bead 820 for firstly removing high frequency noise, and uses a capacitor 830 having a second low series equivalent resistance value, and a third low drop out (LDO) regulator ( 840 may be used, and a large capacity capacitor 850 may be used in the fourth order.
  • LDO low drop out
  • the LDO regulator regulates the voltage linearly even when the supply voltage is very close to the output voltage.
  • LDO regulators offer low voltage drops, low ripple to reduce noise, and simple circuitry for low cost.
  • Voltage input node 810 is coupled to each or a combination of separate power terminals.
  • Each of the separated power supply terminals or a combination thereof is connected to the plurality of noise removing units 721 to 724, respectively.
  • each or a combination of power supply terminals separated to remove noise may be set to +3.7 V, +6 V, -5 V, or the like, and may further include a DC-DC converter.
  • the power source may use a potential difference resulting from the ionization difference of the metal, and may include a primary battery that is not rechargeable and a rechargeable battery that is rechargeable.
  • the type of power source may be changed according to the characteristics of the audio signal reproducing apparatus.
  • the voltage output node 860 is connected to at least one of the clock generator 730, the converting unit 740, the amplifier 750, and the mute unit 760. Stepped voltages are shown in reference numerals 801, 802, and 803, and it can be seen that the voltage of the voltage output node 860 has a smooth value.
  • FIGS. 9 and 10 illustrate synchronizing clocks between an audio signal converting apparatus and an audio signal reproducing apparatus according to embodiments of the present invention.
  • Synchronization is to match the operation timing of the audio signal conversion device 300 and the audio signal reproduction device 200. That is, there is no time transition between the clock signal referenced by the converting unit 340 of the audio signal converter 300 and the clock signal referenced by the signal processor 210 of the audio signal reproducing apparatus 200. The reference time of the clock signal is unified. Synchronization may mean matching data as well as timing operation between modules.
  • the signal processor 210 of the audio signal reproducing apparatus 200 transmits frequency information according to the quality of the audio signal to the clock generator 330 of the audio signal converting apparatus 300.
  • the clock generator 330 of the audio signal converter 300 receives frequency information and / or control signals from the signal processor 210 of the audio signal reproducing apparatus 200 to generate a first clock signal having a preset frequency. do.
  • the clock generator 330 generates a master clock (MCLK), a left-right clock (LRCK), and a bit clock (BITCLK) as a first clock signal according to frequency information.
  • MCLK master clock
  • LRCK left-right clock
  • BITCLK bit clock
  • the audio signal reproducing apparatus 200 and the audio signal converting apparatus 300 synchronize with the first clock signal.
  • the signal processor 210 of the audio signal reproducing apparatus 200 generates a control signal synchronized with the first clock signal.
  • the phase synchronization circuit in the clock generator 330 performs a function of controlling the output signal by using a phase difference between the input signal and the feedback signal from the output signal, and adjusts the frequency of the output signal according to the input signal.
  • the signal processor 210 of the audio signal reproducing apparatus 200 receives a clock signal and / or a control signal from the clock generator 330 of the audio signal converting apparatus 300, and controls to determine a final operation timing between devices.
  • the signal is transmitted to the converting unit 340 of the audio signal converter 300.
  • the converting unit 340 receives the clock signals 582 from the clock generator 330, receives the control signals from the clock generator 500 and the signal processor 210, and receives the signal signals from the signal processor 210. Convert digital audio signals to analog audio signals.
  • the signal processor 210 detects whether the clock generator 330 is abnormal. When an abnormality occurs in the clock generator 330, the clock generator 330 determines an operation state according to a control signal from the signal processor 210 of the audio signal reproducing apparatus 200. According to a control signal including an initialization signal and a disable signal, the clock generator 330 performs an initialization process or terminates an operation.
  • the signal processor 210 When the operation of the clock generator 330 ends, as shown in FIG. 10, the signal processor 210 generates a second clock signal.
  • the audio signal reproducing apparatus 200 and the audio signal converting apparatus 300 synchronize with the second clock signal.
  • FIG. 11 is a diagram illustrating a converting unit of an audio signal conversion apparatus according to an embodiment of the present invention.
  • the converting unit 740 converts the digital signal received from the audio signal reproducing apparatus into an analog signal using the synchronized control signal and the clock signals.
  • the converting unit 740 may be implemented with a plurality of modules.
  • the converting unit 740 can convert a high quality analog signal through averaging of output noise.
  • the consumption current may be increased. This problem may be solved by individually controlling the current of the converting unit 740.
  • the converting unit 740 includes a power supply terminal 1110, a clock signal input unit 1120, a data input unit 1130, a converter 1140, a control signal receiver 1150, and an analog signal output unit 1160.
  • the power supply terminal 1110 of the converting unit 740 is connected to the noise removing unit 722.
  • the clock signal input unit 1120 receives the first clock signal generated by the clock generator 100.
  • the data input unit 1130 receives an audio signal synchronized with the signal processor 210.
  • the control signal receiver 1150 receives the frequency information and / or the control signal from the signal processor 210.
  • the converter 1140 converts the discrete signal synchronized by the processor 200 into an analog signal and outputs the analog signal.
  • the analog signal output unit 1160 outputs the converted analog signal and transmits the converted analog signal to the amplifier 750.
  • the converter 1140 may generate a reference clock signal according to the received frequency information, compare the generated reference clock signal with the first clock signal, calculate an error, and correct the first clock signal.
  • the converter 370 may generate a reference clock signal according to the received frequency information, compare the generated reference clock signal with a second clock signal, calculate an error, and correct the second clock signal.
  • FIG. 12 is a diagram illustrating an amplifier of an audio signal conversion apparatus according to an embodiment of the present invention.
  • the amplifier 750 may include a pre-amp for controlling an analog signal and a power-amp for amplifying power, and an integrated amplifier in which the pre-amp and the power amplifier are combined. It is also possible to implement However, the shape of the amplifier 750 in the present embodiment is not limited thereto, and may be arbitrarily changed according to the purpose and function of the digital signal converter 750.
  • the amplifier 750 includes a power supply terminal 1210, an analog signal input unit 1220, an amplifier unit 1230, and an amplified signal output unit 1160.
  • the power supply terminal 1210 of the amplifier 750 is connected to the noise removing unit 723.
  • the analog signal input unit 1220 receives an analog signal output from the converting unit 740 through a plurality of channels. Channels input to the analog signal input unit 1220 are four channels in total, including two RIGHT channels and two LEFT channels.
  • the amplifier unit 1230 performs a function of increasing the power of the analog signal.
  • the amplified signal output unit 1240 outputs the amplified analog signal.
  • the channels output from the amplified signal output unit 1240 are two channels in total and include a RIGHT channel and a LEFT channel.
  • the amplifier unit 1230 may include a plurality of OP-AMP devices, and may have a structure in which a gain is gradually increased.
  • the gain of each OP-AMP device may have an optimized value considering noise, and may have a feedback circuit including a resistance device between each amplification device.
  • FIG. 13 is a diagram illustrating wiring of an audio signal conversion apparatus according to an embodiment of the present invention, and includes a converting unit 740 and an amplifier 750 of FIG. 7.
  • the left and right output channels 1330 of the amplified signal output unit 1310 may have a structure surrounded by a GND (ground ground) 1320 to avoid signal interference.
  • the amplified signal output unit uses cross talk as a criterion for evaluating the interference of signals of left and right output channels, which means channel separation, and indicates the interference of signals in the left and right channels of the amplified signal output unit. Indicates.
  • the amplified signal output unit has a structure that surrounds the left and right output channels with GND, thereby improving channel separation.
  • the converting unit 740 may have a spaced structure in order to prevent overlapping of portions in which digital noise may be induced on the internal circuit pattern.
  • the digital signal line and the analog signal line of the converting unit 740 are spaced apart as much as possible.
  • the spacing structure may be spaced apart on a two-dimensional plane or spatially spaced in layers of other layers in three-dimensional space. In this case, the separation distance may have a predetermined value or more in consideration of the size and reproduction sound quality of the audio signal conversion apparatus 300.
  • the amplifier 750 may have a design optimized for the converting unit 430 to reduce noise.
  • the wiring of the internal circuit of the amplifier 440 may have a maximum spaced-out structure in order to prevent duplication of portions where digital noise may be induced.
  • the separation distance may have a predetermined value or more in consideration of the size of the audio signal conversion apparatus 300 and the reproduction sound quality.
  • FIG. 14 is a block diagram illustrating a mute unit of an audio signal conversion apparatus according to an embodiment of the present invention
  • FIG. 15 is a circuit diagram specifically showing a mute unit of an audio signal conversion apparatus according to an embodiment of the present invention.
  • 16 illustrates pop noise.
  • the mute unit 760 has a configuration optimized for high output and may include a timing setting unit 1410 and a timing adjusting unit 1420 to adjust timing.
  • the timing setting unit 1410 performs a function of first setting mute timing for the audio signal when a high output audio signal is input. In detail, the timing setting unit 1410 performs a function of catching the overall mute timing. The timing setting unit 1410 may set a mute timing over the entire input audio signal to perform a function of catching the overall mute timing.
  • the timing adjusting unit 1420 performs a function of adjusting the muting timing secondarily with respect to the audio signal in which the muting timing is primarily set by the timing setting unit 1410. In detail, the timing adjusting unit 1420 performs a function of capturing the fine timing of the mute. The timing adjusting unit 1420 may perform a function of capturing the fine timing of the mute by adjusting the muting timing for each part of the audio signal in which the muting timing is set.
  • the mute unit 760 preferably includes at least one timing adjusting unit 1420 together with the timing setting unit 1410.
  • the first muting processor 1430 When a high output audio signal is input, the first muting processor 1430 first mutes the audio signal based on the muting timing set and adjusted by the timing setting unit 1410 and the timing adjusting unit 1420. do.
  • the first mute processing unit 1430 removes pop noise generated when the digital signal converter is powered on / off by muting the audio signal at a predetermined mute timing.
  • the first mute processing unit 1430 may remove pop noise, particularly negative pop noise, associated with the audio signal by first muting the audio signal.
  • the second mute processing unit 1440 mutes timing set and adjusted by the timing setting unit 110 and the timing adjusting unit 120 when the input audio signal is primarily muted at the timing determined by the first muting processing unit 130. Performs a function of secondly muting this audio signal on the basis of.
  • the second mute processor 1440 may remove the pop noise by muting the audio signal at a predetermined timing together with the first mute processor 130. In this case, the second muting processor 1440 may remove positive pop noise associated with the audio signal.
  • the mute apparatus 100 may include only the first mute processor 130.
  • the first mute processor 130 may perform a function of removing positive pop noise as well as negative pop noise.
  • the timing setting unit 110 includes a first resistor 111 and a first capacitor 112.
  • the first resistor 111 and the first capacitor 112 have a structure connected in parallel.
  • the first resistor 111 is connected to a collector of the first transistor 201 to adjust an output voltage.
  • one side thereof is connected to the collector of the first transistor 201, and the other side thereof is connected to the ground GND.
  • the emitter of the first transistor 201 is connected to the ground GND, and the base of the first transistor 201 is a mute signal input unit 211 for muting the audio signal in the audio signal reproducing apparatus. Is connected to.
  • the mute unit 760 may further include a second resistor 221 connected in parallel with the first transistor 201.
  • the second resistor 221 one side thereof is connected to the mute signal input unit 211, and the other side thereof is connected to the ground GND.
  • the second resistor 221 corresponds to a protection resistor.
  • At least two timing adjusting units 1420 may be provided in the muting apparatus 100.
  • the first timing adjusting unit 120a includes a third resistor 121 and a second capacitor 122.
  • the third resistor 121 and the second capacitor 122 have a structure connected in series.
  • the third resistor 121 is connected to the collector of the second transistor 202 to adjust the output voltage.
  • the second capacitor 122 In the case of the second capacitor 122, one side thereof is connected to the collector of the second transistor 202, and the other side thereof is connected to the ground GND. Meanwhile, the emitter of the second transistor 202 is connected to Vcc, and the base of the second transistor 202 is connected to the timing setting unit 110.
  • the mute unit 760 may further include a fourth resistor 222 connected in parallel to the third resistor 121.
  • the fourth resistor 222 performs a function of adjusting the output voltage. In the case of the fourth resistor 222, one side thereof is connected to the collector of the second transistor 202, and the other side thereof is connected to the ground GND.
  • the mute unit 760 may further include a third capacitor 231 connected to the timing setting unit 110.
  • a third capacitor 231 connected to the timing setting unit 110.
  • one side thereof is connected to the first resistor 111 of the timing setting unit 110, and the other side thereof is connected to the ground GND.
  • the second timing adjuster 120b includes a fifth resistor 123 and a fourth capacitor 124.
  • the fifth resistor 123 and the fourth capacitor 124 have a structure connected in series.
  • the fifth resistor 123 is connected to the first timing adjuster 120a to adjust the output voltage.
  • one side thereof is connected to the fifth resistor 123, and the other side thereof is connected to the ground GND.
  • the mute unit 760 may further include a fifth capacitor 232 and a sixth capacitor 233 connected to the second timing adjuster 120b.
  • the fifth capacitor 232 and the sixth capacitor 233 have a structure connected in parallel.
  • one side thereof is connected to the fifth resistor 123 of the second timing adjusting unit 120b, and the other side thereof is connected to the second muting processor 140.
  • the sixth capacitor 233 similarly to the fifth capacitor 232, one side thereof is connected to the fifth resistor 123 of the second timing adjusting unit 120b, and the other side thereof is connected to the second muting processor 140. do.
  • the second mute processing unit 140 may be implemented as a dual FET.
  • the fifth capacitor 232 and the sixth capacitor 233 may be connected to the FETs of the second mute processor 140, respectively.
  • the fifth capacitor 232 and the sixth capacitor 233 may be provided in the mute unit 760 in an open form.
  • the first mute processing unit 130 includes a first field effect transistor (FET) 131 and a second FET 132.
  • FET field effect transistor
  • the first mute processor 130 is implemented as a single FET, it is difficult to completely remove the pop noise, and in particular, it is difficult to solve the pop noise leaking toward the negative side.
  • Pop noise is noise generated when power is supplied or interrupted, and refers to noise generated by a voltage of a charged capacitor when a circuit having a capacitor having a charged voltage is connected to another electric circuit. In FIG. 16, negative pop noise 1610 and positive pop noise 1620 are illustrated. Negative pop noise is noise that leaks toward the negative side.
  • the first mute processing unit 130 included in the muting unit 760 may remove the negative pop noise 310 by first muting the input audio signal according to a predetermined muting timing.
  • the first mute processor 130 is implemented as a dual FET.
  • the first FET 131 and the second FET face each other. 132 is disposed to solve the above problem.
  • the first FET 131 is the timing setting unit 110 and the first timing adjusting unit 120a.
  • the audio signal is muted according to the timing determined by the second timing adjusting unit 120b to the second muting processing unit 140.
  • the second FET 132 may include the timing setting unit 110, the first timing adjusting unit 120a, and the like.
  • the audio signal is muted according to the timing determined by the second timing adjusting unit 120b and transmitted to the second muting processing unit 140.
  • the second mute processing unit 140 includes a third FET 141 and a fourth FET 142. Like the first mute processor 130, the second mute processor 140 may be implemented as a dual FET. In addition, the third FET 141 and the fourth FET 142 are disposed such that the drain and the source of the third FET 141 and the drain and the source of the fourth FET 142 face each other.
  • the third FET 141 is disposed at a timing determined by the timing setting unit 110, the first timing adjusting unit 120a, and the second timing adjusting unit 120b. Accordingly, the audio signal is muted and output through the right output terminal AUDIO_R_OUT 214.
  • the fourth FET 142 is timing determined by the timing setting unit 110, the first timing adjusting unit 120a, and the second timing adjusting unit 120b.
  • the audio signal is muted and output through the left output terminal AUDIO_L_OUT 215.
  • the second mute processing unit 140 provided in the muting unit 760 may secondly mute the audio signal subjected to the first muting process by the first muting processing unit 130 according to a predetermined muting timing to suppress the positive pop noise 320. Can be removed.
  • the plurality of components may be combined with each other to be implemented as at least one module.
  • the components are connected to the communication path connecting the software module or the hardware module inside the device and operate organically with each other. These components communicate using one or more communication buses or signal lines.
  • the audio signal conversion apparatus may be implemented in a logic circuit by hardware, firmware, software, or a combination thereof, or may be implemented using a general purpose or special purpose computer.
  • the device may be implemented using a hardwired device, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or the like.
  • the device may be implemented as a System on Chip (SoC) including one or more processors and controllers.
  • SoC System on Chip
  • the audio signal reproducing apparatus may be mounted in the form of software, hardware, or a combination thereof in a computing device or server provided with hardware elements.
  • the computing device or server includes all or part of a communication device such as a communication modem for performing communication with various devices or wired and wireless communication networks, a memory for storing data for executing a program, and a microprocessor for executing and operating a program. It can mean a variety of devices including.
  • Computer-readable media refers to any medium that participates in providing instructions to a processor for execution.
  • Computer-readable media can include program instructions, data files, data structures, or a combination thereof. For example, there may be a magnetic medium, an optical recording medium, a memory, and the like.
  • the computer program may be distributed over networked computer systems so that the computer readable code is stored and executed in a distributed fashion. Functional programs, codes, and code segments for implementing the present embodiment may be easily inferred by programmers in the art to which the present embodiment belongs.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un appareil pour éliminer un bruit d'alimentation, et un appareil pour convertir des signaux audio, les modes de réalisation de la présente invention éliminant les composantes de bruit introduites à partir d'un terminal d'alimentation d'un appareil de conversion de signal audio en phases, et à transmettre l'énergie du terminal d'alimentation à l'unité de conversion et à l'unité d'amplification dans l'appareil de conversion de signal audio, ce qui permet au bruit d'alimentation d'être éliminé.
PCT/KR2017/006096 2017-04-07 2017-06-12 Appareil pour éliminer un bruit d'alimentation, et appareil pour convertir un signal audio WO2018186530A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/500,784 US10819304B2 (en) 2017-04-07 2017-06-12 Apparatus for discarding power noise, and apparatus for converting audio signal

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2017-0045406 2017-04-07
KR20170045406 2017-04-07
KR10-2017-0072615 2017-06-09
KR1020170072615A KR102283540B1 (ko) 2017-04-07 2017-06-09 전원 노이즈 제거 장치 및 오디오 신호 변환 장치

Publications (1)

Publication Number Publication Date
WO2018186530A1 true WO2018186530A1 (fr) 2018-10-11

Family

ID=63712140

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2017/006096 WO2018186530A1 (fr) 2017-04-07 2017-06-12 Appareil pour éliminer un bruit d'alimentation, et appareil pour convertir un signal audio

Country Status (1)

Country Link
WO (1) WO2018186530A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005025586A (ja) * 2003-07-04 2005-01-27 Hitachi Ltd 旅行情報提供サービス方法、旅行情報提供サービスシステム、情報提供サービス会社の情報管理サーバおよび旅行情報提供サービス用プログラム
KR20060021153A (ko) * 2004-09-02 2006-03-07 엘지전자 주식회사 에스디 카드 슬롯을 이용한 외장형 스피커 장치
JP2010028784A (ja) * 2008-06-16 2010-02-04 Trigence Semiconductor Inc デジタルスピーカー駆動装置，デジタルスピーカー装置，アクチュエータ，平面ディスプレイ装置及び携帯電子機器
US8290171B1 (en) * 2009-08-20 2012-10-16 Maxim Integrated Products, Inc. Headset with microphone and wired remote control
US20150071464A1 (en) * 2013-09-12 2015-03-12 Stmicroelectronics (Shenzhen) R&D Co. Ltd. Methods and circuits to reduce pop noise in an audio device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005025586A (ja) * 2003-07-04 2005-01-27 Hitachi Ltd 旅行情報提供サービス方法、旅行情報提供サービスシステム、情報提供サービス会社の情報管理サーバおよび旅行情報提供サービス用プログラム
KR20060021153A (ko) * 2004-09-02 2006-03-07 엘지전자 주식회사 에스디 카드 슬롯을 이용한 외장형 스피커 장치
JP2010028784A (ja) * 2008-06-16 2010-02-04 Trigence Semiconductor Inc デジタルスピーカー駆動装置，デジタルスピーカー装置，アクチュエータ，平面ディスプレイ装置及び携帯電子機器
US8290171B1 (en) * 2009-08-20 2012-10-16 Maxim Integrated Products, Inc. Headset with microphone and wired remote control
US20150071464A1 (en) * 2013-09-12 2015-03-12 Stmicroelectronics (Shenzhen) R&D Co. Ltd. Methods and circuits to reduce pop noise in an audio device

Similar Documents

Publication Publication Date Title
US9872103B2 (en) Microphone biasing circuitry and method thereof
KR101607899B1 (ko) 감소된 크로스토크 잡음을 가진 집적 헤드셋 스위치를 위한 방법 및 장치
WO2019017596A1 (fr) Système de gestion de batterie sans fil et bloc-batterie le comprenant
KR101357984B1 (ko) 전자 장치 제어 시스템, 전자 장치 제어를 위한 복수의 수동 스위치를 구비한 오디오 부속물, 및 전자 장치 제어 방법
Nagari et al. An 8$\Omega $2.5 W 1%-THD 104 dB (A)-Dynamic-Range Class-D Audio Amplifier With Ultra-Low EMI System and Current Sensing for Speaker Protection
WO2020032363A1 (fr) Procédé et dispositif électronique permettant d'ajuster le niveau de sortie d'un haut-parleur sur la base d'une distance par rapport à un dispositif électronique externe
WO2020080910A1 (fr) Dispositif électronique pour éviter la détérioration des communications et procédé de contrôle correspondant
WO2014121576A1 (fr) Procédé et dispositif permettant de fournir de l'énergie pour des écouteurs réducteurs de bruit à l'aide de l'alimentation électrique d'un dispositif électronique
WO2019066293A1 (fr) Dispositif électronique doté d'une structure de circuit ayant une connexion électrique entre une broche désignée incluse dans un connecteur pouvant être connecté électriquement à une borne de masse d'un microphone externe et une masse désignée d'une carte de circuit imprimé
KR102283540B1 (ko) 전원 노이즈 제거 장치 및 오디오 신호 변환 장치
WO2018186530A1 (fr) Appareil pour éliminer un bruit d'alimentation, et appareil pour convertir un signal audio
WO2018186595A1 (fr) Structure de câblage pour appareil de conversion de signal audio permettant d'améliorer la diaphonie, et appareil de conversion de signal audio
WO2018186526A1 (fr) Appareil de blocage de signal audio, et appareil de conversion de signal numérique équipé de celui-ci
WO2018186525A1 (fr) Appareil de conversion de signal modulaire ayant une horloge synchronisée, et appareil de traitement de données
KR20150107518A (ko) 노이즈 제거 기능을 구비하는 전자 장치
WO2018030700A1 (fr) Casque d'écoute sans fil et système d'amplification sonore l'utilisant
CN104683915A (zh) 电子设备及耳机检测电路、方法和装置
US12040761B2 (en) Audio signal muting apparatus using negative power, and digital signal conversion apparatus equipped with same
WO2022186584A1 (fr) Dispositif électronique comprenant un ventilateur et procédé pour faire fonctionner un dispositif électronique comprenant un ventilateur
CN216774909U (zh) 一种带功放功能的投影仪
CN211718875U (zh) 声卡装置
WO2024029711A1 (fr) Dispositif audio inclus dans un dispositif électronique et son procédé de commande
WO2024029849A1 (fr) Appareil et procédé permettant de commander un signal audio sur la base d'un capteur
JP2020205566A (ja) 音電気変換装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17904465

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17904465

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载