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EP1693980A2 - Bloc convertisseur à faible bruit pour la réception de la radiodiffusion directe par satellite - Google Patents

Bloc convertisseur à faible bruit pour la réception de la radiodiffusion directe par satellite Download PDF

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Publication number
EP1693980A2
EP1693980A2 EP06003462A EP06003462A EP1693980A2 EP 1693980 A2 EP1693980 A2 EP 1693980A2 EP 06003462 A EP06003462 A EP 06003462A EP 06003462 A EP06003462 A EP 06003462A EP 1693980 A2 EP1693980 A2 EP 1693980A2
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EP
European Patent Office
Prior art keywords
lnb
signals
satellite
output
satellite receiver
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP06003462A
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German (de)
English (en)
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EP1693980A3 (fr
Inventor
Gil Laifer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FTA Communication Technologies SARL
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FTA Communication Technologies SARL
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Filing date
Publication date
Application filed by FTA Communication Technologies SARL filed Critical FTA Communication Technologies SARL
Publication of EP1693980A2 publication Critical patent/EP1693980A2/fr
Publication of EP1693980A3 publication Critical patent/EP1693980A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving

Definitions

  • the invention relates to an LNB receiving device according to the preamble of claim 1, a method for forming a DBS system or for connecting a satellite receiver to a DBS system and a method for pairing between an LNB and a satellite receiver.
  • Satellite receivers generally have a satellite antenna, e.g. As a symmetrical parabolic antenna or offset parabolic antenna, for receiving and bundling of DBS signals of a satellite, the bundled signals are bundled on a receiving system serving as LNB (low noise block converter, low-noise converter).
  • LNB low noise block converter, low-noise converter
  • SHF Super High Frequency
  • the output of the intermediate frequency converter block thus four output signals, namely a lower horizontal and lower vertical band of 950 to 1,950 MHz and an upper horizontal and upper vertical band of 1100 to 2150 MHz, which are output to an IF matrix, the in turn, at multiple outputs allows the optional access to each of the four incoming frequency bands.
  • a plurality of satellite receivers are connected to these multiple lines via a plurality of lines routed in parallel or satellite tuner connected to the selection of the respective frequency band z.
  • B. a DC switching voltage between 14V and 18V to select the polarization plane and a 22 kHz switching signal to select the respective lower and upper intermediate frequency band output. This results in a star-shaped distribution of z.
  • the receivers may output standard control commands according to the DiSEqC (Digital Satellite Equipment Control) standard, in which the 22 kHz switching signal is used as a carrier for digital messages, to the LNB for selecting the respective frequency band.
  • DiSEqC Digital Satellite Equipment Control
  • US 6,205,185 B1 describes a receiver for a DBS system and a method for implementing various receive modes.
  • US 6,334,045 B1 describes a satellite system which can transmit signals of two different frequencies and polarities simultaneously via the same cable. Here, two different polarity commands from two or more different sources are accepted simultaneously.
  • the invention is based on the object to provide an LNB receiving device and a method for their use, which allow a small additional retrofit effort when using multiple satellite receiver.
  • an LNB receiving device according to claim 1.
  • the dependent claims describe preferred developments.
  • methods for using these LNBs are provided, e.g. A plug & play method of connecting another satellite receiver to a satellite receiving system having such an LNB, and a method of pairing an LNB with a satellite receiver, i. for pairing or verifying, authenticating or verifying that a subsequent satellite receiver is allowed.
  • the invention also relates to the LNB with the LNB receiving device.
  • the IF frequencies provided by the IF matrix are thus received by a second IF converter block, frequency converters, preferably adjustable oscillators, in particular voltage-controlled ones, being provided at the outputs of the IF matrix Oscillators (VCOs) are provided which, depending on a control signal, request a respective frequency band from the IF matrix (ie control the matrix to output the frequency band) and each time to a predetermined, fixed frequency band. Subsequently, these fixed frequency bands are superimposed or combined (superposed) in a coupler block (combiner, combiner block) and output to a single output cable.
  • VCOs IF matrix Oscillators
  • the predetermined frequency bands are separated within the IF frequency range of 950 to 2150 MHz and advantageously have a bandwidth set by bandpass filters.
  • the Bandwidth advantageously corresponds to the bandwidth of the transponder, the z. B. is less than or equal to 40 MHz.
  • the output signals of the VCOs can optionally be output via baluns or baluns.
  • the multiple satellite receiver can be connected to the one output cable z. B. be connected by a cascade circuit or shared bus circuit or series connection; each of the satellite receiver is assigned a frequency band, so that in several frequency bands corresponding to more than four, z. B. eight satellite receiver can be connected.
  • the satellite receivers can be connected in series with a cable, for example in multi-storey houses from one floor to the other, up to eight floors, with only one cable.
  • the setting or selection of the respective frequency band by the satellite receiver is again - according to conventional satellite receivers or DBS systems - via a DC switching signal and 22 kHz signal, which is returned via the one output line and in the LNB receiving device of the invention a control device recorded and used to control the VCOs.
  • the LNB reception device can in particular be realized on a printed circuit board which is subsequently inserted into the housing of the LNB. All modules can be accommodated in the LNB, a subsequent connection of modules is basically not required.
  • a DBS system 7 has a satellite antenna 1 in concave form - generally a symmetrical parabolic antenna or offset parabolic antenna - an LNB (Low Noise Block) connected to the satellite antenna 1 via a holder 2 Converter, low-noise coaster assembly) 3, an output cable 4 connected to the LNB 3, generally a coaxial cable, and four satellite receivers 5.1, 5.2, 5.3 and 5.4.
  • the satellite antenna 1 is directed in a known manner to a communication satellites or broadcasting satellites and concentrates incident electromagnetic DBS signals in the SHF frequency range of 3 to 30 12 GHz to the LNB 3 rigidly attached to it.
  • the LNB 3 is known per se a horn antenna (Feed Horn), a SHF (Super High Frequency) filter, a polarizer and the LNB receiver 6 explained in more detail in Figure 4, which receives the polarization separated electromagnetic DBS signals, converted into electrical signals, a IF conversion performs and on the output cable 4, an intermediate frequency signal in the intermediate frequency (IF, intermediate frequency) range from 950 to 2150 MHz outputs to the satellite receiver 5.1 to 5.4.
  • IF Intermediate Frequency
  • the satellite receiver 5.1 to 5.4 z. B. be connected in cascade in a shared bus circuit.
  • Each of the satellite receivers 5.1, 5.2 and 5.3 thus each leaves a connecting cable 8 to the next satellite receiver 5.2, 5.3 or 5.4, so that a cascade is formed.
  • the IF signal output from the LNB 3 to the output cable 4 has four frequency bands in the frequency range of 950 to 2150 MHz with a bandwidth of z. B. 40 MHz.
  • more than four satellite receiver, z. For example, eight satellite receivers can be connected and, correspondingly, the IF signal output from the LNB 3 can be divided into eight bands, the set 40 MHz bandwidth being selected such that the bands do not overlap or do not overlap to any relevant extent.
  • a DBS system 7 is formed, in which the satellite antenna 1 with holder 2 and the LNB 3 is mounted outside the house in a known manner, and in the house a single output cable 4 or RF cable to the satellite receivers 5.1 bis 5.4 is performed.
  • FIG. 2 shows another embodiment of a DBS system 7, in which outside the house in turn the satellite antenna 1 with the holder 2 and the LNB 3, the LNB 3 having in addition to the first output 8 for the output cable 4 in this embodiment a conventional output terminal 9 (legacy output port) to which a conventional second output cable 11 is connected Satellite receiver 12 is connected, which has no extended DiSEqC instruction set.
  • a frequency spectrum according to the diagram 14 is output to the second output cable 11 with a lower band between 950 and 1,950 MHz and a partially overlapping upper band between 1,100 and 2,150 MHz.
  • FIG. 3 shows a further embodiment of a DBS system 7, in which the LNB 3 has an additional input terminal 14 for a terrestrial antenna 15.
  • a splitter 16 is provided to connect a terrestrial receiver 18.
  • FIG. 4 shows the circuit diagram of the LNB receiver 6 accommodated in a single LNB housing, which in the LNB 3 contains the electromagnetic DBS signals in the SHF range from 3 to 30 GHz, via the horn antenna, the SHF filter and the polarization diverter arrive, absorbs, amplifies and implements.
  • the LNB receiver 6 has an antenna block 1, a first intermediate frequency (IF) converter block 22, an IF matrix 23, a second IF converter block 24, a combiner block (coupler) 25 and a microcontroller (MCU) 26 ,
  • Incoming electromagnetic mutually orthogonal DBS signals DBS1 and DBS2 are received by a first receiving sample 30 and a second receiving sample 31.
  • the mutually orthogonal DBS signals DBS1, DBS2 z are received by a first receiving sample 30 and a second receiving sample 31.
  • the vertical reception sample 30 outputs the received RF signal via two low noise amplifiers LNA1, LNA2 to two bandpass filters BPF1A, BPF1B connected in parallel; Accordingly, the second reception sample 31 outputs the RF electric signal to two parallel band pass filters BPF1 C, BPF1 D in the IF converter block 22 via two low-noise amplifiers LNA3, LNA4.
  • the vertical RF signal output from the low-noise amplifiers LNA1, LNA2 is filtered through two parallel band-pass filters BPF1A and BPF1B and input to a first mixer MIX1 and a second mixer MIX2, respectively; Accordingly, the horizontal RF signal outputted from the low-noise amplifiers LNA3 and LNA4 is supplied to a third and fourth mixer MIX3 and MIX4 via two parallel band-pass filters BPF1C and BPF1D in a conventional manner.
  • the input RF signals are mixed with a frequency from an oscillator O1 of 9.75 GHz, so that a sum and difference of the combined frequencies are formed in a manner known per se, of which subsequently in the low frequency Bandpass filter LBF1 the lower intermediate frequency in the band 950 to 1,950 MHz is passed and, accordingly, the superimposed or mixed signal output from the mixer MiX4 via the low-frequency band-pass filter LBF4 filtered and output via an amplifier.
  • both the horizontal and the vertical signal in the IF converter block are divided into two frequency bands, an upper frequency band of 1,100 to 2,150 MHz and a lower frequency band of 950 to 1,950 MHz, so that a total of four groups of signals are output, namely one vertical bottom band, vertical top band, horizontal lower band and horizontal upper band following the mxn IF matrix 23, e.g. As a 4 X 4 IF matrix 23, are output.
  • the IF matrix 23 allows each of the four input signals or signal groups at each of its four outputs to be output as a selected satellite transponder frequency.
  • VCOs Voltage Controlled Oscillators
  • 40, 41, 42, 43 each receiving an output signal of the IF matrix 23, to a fixed IF frequency within the IF frequency range of 950 to 2150 MHz and in each case by means of a bandpass filter, z. B. Filter SAW filters with a bandwidth of 40 MHz.
  • the VCOs 40, 41, 42, 43 are - in a basically known manner - by a DC switching voltage 14V / 18V between the signals of the vertical plane of polarization and the horizontal polarization plane and with a 22 kHz switching signal between the lower IF band and the upper IF Band switched.
  • balun or balun 44, 45, 46, 47 is connected to the VCOs 40, 41, 42, 43 so that asymmetrical or unbalanced second IF signals IF2 are output.
  • the second ZF signals IF2, each having a fixed IF frequency, output by the second IF converter block 24 are subsequently filtered in the combiner block 25 via bandpass filters BPF4A, BPF4B, BPF4C, BPF4D, superimposed in a combination device (combiner, coupler) 50 and over an amplifier 52 as an IF output signal IF3 output via the output cable 4.
  • the satellite receiver 5.1, 5.2, 5.3, 5.4 in turn give - in a conventional manner - via the DC switching voltage and the 22 kHz signal to the MCU 26 and a DC-DC converter 55 control signals, which are used according to the invention for adjusting the VCOs 40, 41, 42, 43.
  • the DC-DC converter 55 thus serves as a voltage supply and provides the voltage levels for the various ICs in the LNB, ie the MCU 26 and the VCOs 40, 41, 42, 43, the supply voltage also being applied to the circuit via the LDO 27 28 is outputted to the control or bias adjustment of the blocks 21, 22, which provides the power supply and setting signals or control signals for the antenna block 21 and the first IF converter block 22 in a manner known per se.
  • the output from the combiner block 25 on the output cable 4 third IF signal IF3 thus has in the frequency range between 950 and 2150 MHz four frequency bands with a bandwidth of z. Each at 40 MHz; It can be suitably z. B. eight frequency bands are output in this frequency range. Their frequencies or middle frequencies are in each case fixed, since according to the invention, the satellite receiver 5.1 to 5.4 via the DC switching signal and the 22 kHz signal, the VCOs 40 to 43 such that they each have a desired output to the respective IF Tape.
  • FIGS. 9 and 10 show corresponding LNB receiving devices for FIG. 2 or FIG. 3, wherein in FIG. 10 a DC block and filter device 90 is additionally provided.
  • a plug-and-play method or method for connecting an additional satellite receiver to the DBS system or single-cable network according to the invention is described below:
  • the digital switching method DiSEqC known per se can be used, in which the 22 kHz switching signal is used as a carrier or carrier for digital messages.
  • the 22 kHz switching signal is used as a carrier or carrier for digital messages.
  • a master IC which sends a command telegram to the slave IC in the switching matrix and the slave IC in the LNB, whereupon the slave ICs for confirmation send a response telegram.
  • the command telegrams generally consist of header, address part, command part and data parts; the response message has a header and data parts.
  • the transmission sequence is controlled by the micro-controller or the micro-processor in the satellite tuner or the satellite receiver.
  • the command telegram generally selects the LNB, the plane of polarization and the frequency band.
  • the parts of the telegrams are generally composed of 8 bits and a parity bit, wherein a bit having the value "0" consists of 22 oscillations of the 22 kHz switching signal and a pause corresponding to the time of 11 oscillations, and a bit with the value "1" consists of 11 oscillations of the 22 kHz switching signal and a pause, which corresponds to a time expenditure of 22 oscillations.
  • the protocol used in conventional satellite receivers is extended by further control commands or commands.
  • This extended DiSEqC instruction set is recorded in EN 61319-1 and part of the software of the satellite receiver according to the invention.
  • one-way communication from the satellite receiver (IRD) to the LNB, or bidirectional communication between them may be made.
  • This method relies on dynamic and automatic IF channel assignment.
  • the IF channels are dynamically assigned by the microcontroller in an automatic configuration, with the microcontroller managing and updating a display table with the status of the IF channels.
  • the status value of each IF channel may be "free" or "busy” or "locked”.
  • the status values are updated based on the communication information sent from the satellite receivers 5.1, 5.2, 5.3, 5.4 to the LNB 3.
  • the satellite receiver transmits a specific control command or a specific command to enable an IF channel, with the status value being switched from busy to free when the satellite receiver is switched off.
  • the microcontroller does not receive three consecutive live signals from a satellite receiver, the respective status value in the respective entry of the display table is set to "free".
  • the satellite receivers may ask for an idle IF channel by an allocation request signal when they are connected.
  • a Plug & Play in particular a "hot plug & play" during operation is thus possible.
  • a semi-automatic method may further be performed in which a manual setting of an IF channel is performed by a connected IRD, wherein a specific user interface option supported by the IRDs is performed, the end user having an IF Manually assign each IRD to the LNB and support a request command from the IRD to display all the available IF channels together so that the end user receives a list of all available IF channels to obtain an IF channel for his IRD wants to join, choose.
  • a pairing method is provided according to the invention, in which a connection between the LNB and the IRD is secured, the method being based on a PIN code, the IRD in the LNB either by direct access to an internal memory of the LNB or through enters a given control command.
  • This method is used by IRDs that allow for return capability or bi-directional communication, where the IRD is the PIN code from the LNB can either read or read back by direct access to its internal memory, or can request the LNB via a predetermined control command to use the IF carrier so that the PIN code is specified, in which case the present carrier as binary "1", and a non-existent carrier is considered "0".
  • z. B. an authorized expansion of an IRDs - z. B. with a special decoder - and subsequent installation in another DBS system can be prevented, so that z.
  • decoders used in pay-TV are relevant in which use in an existing DBS system is allowed at a tariff but not a new use in another DBS system.
  • FIG. 5a shows a display panel in which the status - d.
  • FIG. 5 shows the various IF carriers ZF1, ZF2, ZF3 and ZF4 listed in the first column in the following column. H. a 0 or a 1 - is displayed. Furthermore, in the right column the number of received live signals are displayed, which were received in the last three periods; Accordingly, here the value between 0 (no input, so that the absence of the relevant IRD can be concluded) and 3 vary.
  • Fig. 5c shows the following procedure performed by the controller MCU 26 in the LNB:
  • step T1 a satellite receiver (STB) command is waited by a satellite receiver (eg, an IRD); in a request of a satellite receiver for a free IF carrier is searched according to step T2 for free IF carriers in the display table of FIG. 5a.
  • decision step T3 depending on whether free IF carriers are present, branch N is again returned to step T1 and branch Y, d. H. in the presence of a free IF carrier, this is power and again returned to step T1.
  • step T5 the respective entry in the display table according to FIG. 5a is updated and in step T6 the respective IF carrier + 40 MHz is occupied with power, whereupon in turn is returned to step T1.
  • the counter is continuously updated by the signal of the satellite receiver (IRD).
  • the pairing method according to FIG. 6a shows the routine at the receiving device, ie the respective connected satellite receiver (STB or IRD), which is being started up: First, a request for a PIN is output in step P1; in subsequent step P2, IF carriers are scanned to detect the PIN code; below will be in the decision step P3 checks whether a PIN has been successfully detected. If this is not the case, branch N returns again to step P1; in case a PIN is found, branch Y is checked to see if the PIN code is correct; if this is not the case, according to branch N in step P5, the boot process is stopped and the user informed. If the condition is satisfied in step P4, according to branch Y, the boot process in step P6 is completed.
  • STB or IRD respective connected satellite receiver
  • the routine in the LNB, according to FIG. 6b, is such that in step U1, STB requests are waited, in PIN requests according to step U2, the PIN code in the internal memory is updated and, according to step U3, upon receipt of one PIN request of the ZF-carriers is assigned in each case with achievement.
  • Known commands to DiSEqC are ODU_ChannelChange E0 10 5A channel_byte1 channel_byte2 ODU_PowerOFF E0 10 5A poweroff_byte 00 ODU_SCRxSignal_ON E0 10 5B subfunction_byte XX ODU_Config E0 10 5B subfunction_byte config_byte ODU_LOFREQ E0 10 5B subfunction_byte lofreq_byte
  • commands 0E and 0D are used for direct access to the EEPROM. All commands exist in DiSEqC 2.0 format and start with “E2" instead of "Eo”. The controller MCU 26 responds with an "E4" frame to each command starting with "E2".
  • the invention allows the connection of more than four satellite receivers to the one output line 4, wherein a dynamic IF channel assignment for each new STB or IRB, which is connected to the cascade of satellite receivers 5.1,. .. is connected.
  • the procedure starts with a request to put all free IF frequencies under power.
  • a satellite receiver STB
  • ODU_PowerFreeIF E0 10 5B subfunction_byte
  • the LNB will then power the free channel bearers at mid-frequency + 24 MHz (to avoid an occupied channel interrupt).
  • the satellite receiver will then perform an IF scan. Once she has found a vehicle, she will ask the LNB to "lock" that vehicle for her, using the following command: ODU_ALLOCATE IF (E0 10 5B SUBFUNCTION_BYTE)
  • the LNB will then update the scoreboard and put the requested carrier under power in the center frequency.
  • the satellite receiver will then perform a second scan and, if it identifies the carrier at the center frequency, may conclude that the channel has been assigned to it; see Fig. 7, which is to be set here as SatCR "VCO module”.
  • the satellite receiving device occupancy signals For example, to send N occupancy signals per minute to secure this IF channel for use, otherwise the MCU 26 will "release" that channel.
  • the command becomes ODU_POWER OFF (E0 10 5A POWER OFF_BYTE 00)
  • the controller MCU 26 indicates that the channel in question can be noted as "free" in the table.
  • each in-service satellite receiver will issue an occupancy signal every z.
  • B. Send 60 seconds to the controller MCU 26, by a new command ODU_LIFESIGNAL (E0 10 5B SUBFUNCTION_BYTE).
  • the byte is read from the EEPROM using the 0D instruction, the byte at the dedicated index of the EEPROM.
  • the satellite receiver If the satellite receiver detects a free IF channel, it will mark it as locked by updating the EEPROM using the 0E command.
  • the satellite receiver If the satellite receiver goes into stand-by mode or is completely switched off, it will update or update the EEPROM and mark the vacant IF channel as free (0).
  • the command ODU-POWER OFF (E0 10 5A POWER OFF_BYTE 00) will indicate, in addition to its other operation to the MCU 26, that the respective channel may be marked as "free” in the EEPROM.
  • each on-going satellite receiver will send an assignment signal to the controller MCU 26, for example every 30 seconds, by a new command ODU assignment signal (E0 10 5B SUBFUNKTION_BYTE).
  • N five
  • STBs set satellite boxes
  • the satellite receiver Using the Write command (Write command, OE command), the satellite receiver will write the PIN code into the EEPROM.
  • the satellite receiver Using the read command (read command, 0D command), the satellite receiver will read out the PIN code from the EEPROM.

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Radio Relay Systems (AREA)
EP06003462A 2005-02-21 2006-02-21 Bloc convertisseur à faible bruit pour la réception de la radiodiffusion directe par satellite Withdrawn EP1693980A3 (fr)

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Application Number Priority Date Filing Date Title
DE200510008125 DE102005008125A1 (de) 2005-02-21 2005-02-21 LNB-Empfangseinrichtung

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EP1693980A2 true EP1693980A2 (fr) 2006-08-23
EP1693980A3 EP1693980A3 (fr) 2008-10-29

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EP2119067A2 (fr) * 2007-01-19 2009-11-18 R.F. Magic Inc. Circuits, systèmes, et procédés de construction d'un signal composite
CN103858365A (zh) * 2011-04-16 2014-06-11 熵敏通讯公司 单电缆自动化综合接收解码器安装方法
US9219557B2 (en) 2006-11-03 2015-12-22 Entropic Communications, Llc Circuits, systems and methods for constructing a composite signal
WO2016164005A1 (fr) * 2015-04-08 2016-10-13 Entropic Communications, Inc. Architecture à faible bruit
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US9219557B2 (en) 2006-11-03 2015-12-22 Entropic Communications, Llc Circuits, systems and methods for constructing a composite signal
US10439746B2 (en) 2006-11-03 2019-10-08 Entropic Communications, Llc Satellite signal frequency translation and stacking
US11616585B2 (en) 2006-11-03 2023-03-28 Entropic Communications, Llc Satellite signal frequency translation and stacking
EP2119067A2 (fr) * 2007-01-19 2009-11-18 R.F. Magic Inc. Circuits, systèmes, et procédés de construction d'un signal composite
CN103858365A (zh) * 2011-04-16 2014-06-11 熵敏通讯公司 单电缆自动化综合接收解码器安装方法
EP2700180A4 (fr) * 2011-04-16 2014-09-03 Entropic Communications Inc Procédure d'installation automatique de récepteur-décodeur intégré monocâble
CN103858365B (zh) * 2011-04-16 2016-08-24 熵敏通讯公司 单电缆自动化综合接收解码器安装方法
WO2016164005A1 (fr) * 2015-04-08 2016-10-13 Entropic Communications, Inc. Architecture à faible bruit
CN112422930A (zh) * 2019-08-23 2021-02-26 深圳Tcl数字技术有限公司 Unicable设备识别方法、装置、电视机及介质
CN112422930B (zh) * 2019-08-23 2024-01-19 深圳Tcl数字技术有限公司 Unicable设备识别方法、装置、电视机及介质
CN111314753A (zh) * 2019-12-27 2020-06-19 深圳市北斗万方信息技术有限公司 信号处理方法、数字视频变换设备和低噪声下变频器
CN111314753B (zh) * 2019-12-27 2024-02-20 深圳市北斗万方信息技术有限公司 信号处理方法、数字视频变换设备和低噪声下变频器

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