CN104869460B - A kind of HDMI Wireless Transmitters and signal processing method - Google Patents

Abstract

The invention discloses an HDMI wireless transmitter and a signal processing method. The HDMI wireless transmitter includes: an HDMI signal access module, a control module, a button and indicator light module, and a transmitting module; Input status and signal status identify the current channel, and then output the HDMI audio and video signal to the transmitting module after performing HDCP decryption processing on the HDMI signal input by the current channel; the transmitting module modulates the HDMI audio and video signal onto the preset carrier signal and transmits it; thus Realize the wireless transmission of full HD signal or even ultra high definition signal, greatly improve the clarity of wireless transmission signal, and the delay is very small; at the same time, the control module controls the lighting of the buttons and the indicator light of the indicator module according to the device access status and signal status The off state is convenient for users to understand the signal transmission status of the HDMI wireless transmitter.

Description

HDMI wireless transmitter and signal processing method

technical field

The invention relates to the technical field of television, in particular to an HDMI wireless transmitter and a signal processing method.

Background technique

At present, a variety of peripheral interfaces are set on the TV, which can be connected to different source devices (such as set-top boxes, DVDs, mobile phones, etc.). However, connecting the TV to the source device through a connecting cable will affect the overall appearance, and at the same time, the source device needs to be placed at a relatively short distance from the TV, and the position is relatively fixed and the placement flexibility is small. The wireless signal transmission method can avoid the problems caused by the connection line method, and the source equipment is placed flexibly, so it has been rapidly developed and applied. At present, the common wireless transmission methods between the source equipment and the TV are mainly based on 2.4G/5G, such as WIFI. However, due to the limitation of bandwidth, these wireless transmission methods generally can only transmit standard definition signals, and the video definition is low. If the full HD signal of 1080P (the format standard of the highest level of HD digital TV set by the American Society of Motion Picture and Television Engineers) is transmitted, not only the bandwidth requirement is very high, but also the cost will be greatly increased. At the same time, wireless transmission methods such as WIFI require complex communication, codec and other processing at the transmitting end and receiving end, so there will be delays and signal jams.

Contents of the invention

In view of the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an HDMI (High Definition Multimedia Interface, high-definition multimedia interface) wireless transmitter and a signal processing method to solve the problems caused by the use of wired connections in existing source equipment. The location is limited, and the bandwidth of the wireless connection is limited.

In order to achieve the above object, the present invention has taken the following technical solutions:

An HDMI wireless transmitter is used to realize wireless communication between an HDMI source device and a receiving display terminal, which includes: an HDMI signal access module, a control module, a button and indicator light module, and a transmitting module; the HDMI signal access module includes at least one HDMI channel for external HDMI source equipment;

The HDMI signal access module identifies the current channel according to the device access status and signal status of the HDMI channel, and then outputs the HDMI audio and video signal to the transmitting module after performing HDCP decryption processing on the HDMI signal input by the current channel; the transmitting module transmits the HDMI audio and video signal It is modulated onto the preset carrier signal and transmitted; the control module controls the on-off status of the buttons and the indicator lights of the indicator module according to the equipment access status and signal status.

In the HDMI wireless transmitter, the HDMI signal access module is also used to detect that any HDMI channel has a signal, and will automatically perform and complete EDID data exchange after the first connection or power-on.

In the HDMI wireless transmitter, the control module is also used to control the HDMI signal access module to maintain the current channel if it is detected that the HDMI channel corresponding to the HDMI source device is not the current channel when the connected HDMI source device is pulled out. The working status of the channel remains unchanged; if the detection is the current channel, the signal status of the subsequent HDMI channels is cyclically judged based on the current channel, and the HDMI signal access module is controlled to set the next HDMI channel with a signal as the current channel.

In the HDMI wireless transmitter, the control module is also used to mark the current channel as the memory channel when the power is off, and control the HDMI signal access module to restore the memory channel to the current channel when the power is turned on again.

In the HDMI wireless transmitter, the control module is also used to control the HDMI signal access module to switch HDMI channels according to the interrupt signal sent by the button and the indicator light module.

In the HDMI wireless transmitter, the button and indicator light module includes at least one button, at least one indicator light and a transmitting light;

The number of the indicator lights is adapted to the number of the HDMI channels, and is used to display the signal status of the corresponding HDMI channels;

The emitting light is used to display the working state of the emitting module;

Each HDMI channel corresponds to a button, and the button outputs an interrupt signal to the control module, and the control module controls the HDMI signal access module to switch the corresponding HDMI channel according to the interrupt signal.

In the HDMI wireless transmitter, the transmitting light corresponds to a reset button, and the reset button generates a reset signal to the transmitting module, and the transmitting module resets according to the reset signal.

In the HDMI wireless transmitter, the transmitting module is also used to send abnormal information to the control module when detecting that there is no HDMI audio and video signal input in the current channel, and the control module controls the HDMI signal access module to reset according to the abnormal information. Back to normal.

The HDMI wireless transmitter also includes a power supply module, which is used to convert the external power supply into a preset voltage to supply power for the HDMI signal access module, the control module, the button and indicator module and the transmitting module.

A signal processing method of an HDMI wireless transmitter, comprising:

The HDMI signal access module identifies the current channel according to the device access status and signal status of the HDMI channel, and performs HDCP decryption processing on the HDMI signal input by the current channel to output HDMI audio and video signals to the transmitting module;

The transmitting module modulates the HDMI audio and video signal onto a preset carrier signal and transmits it;

The control module controls the on and off states of the buttons and the indicator lights of the indicator light module according to the equipment access status and the signal status.

Compared with the prior art, in the HDMI wireless transmitter and signal processing method provided by the present invention, the HDMI signal access module identifies the current channel according to the device access status and signal status of the HDMI channel, and performs HDCP decryption on the HDMI signal input by the current channel After processing, the HDMI audio and video signal is output to the transmitting module; the transmitting module modulates the HDMI audio and video signal onto the preset carrier signal and transmits; thereby realizing the wireless transmission of the full high-definition signal or even the ultra-high-definition signal, and greatly improving the efficiency of the wireless transmission signal The clarity and delay are very small; at the same time, the control module controls the on and off status of the buttons and the indicator lights of the indicator module according to the device access status and signal status, so that users can understand the signal transmission status of the HDMI wireless transmitter.

Description of drawings

FIG. 1 is a schematic diagram of an HDMI wireless transmitter provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the external connection of the HDMI wireless transmitter provided by the embodiment of the present invention;

FIG. 3 is a flowchart of a signal processing method of an HDMI wireless transmitter provided by an embodiment of the present invention.

Detailed ways

The present invention provides an HDMI wireless transmitter and a signal processing method. In order to make the purpose, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The HDMI wireless transmitter provided by the present invention is suitable for communication equipment, computers, mobile phones, PADs and other fields, and is used to realize wireless communication between HDMI source equipment and receiving display terminals, specifically: 1080P full high-definition signals that can be input from HDMI source equipment, Even after HDCP (High-bandwidth Digital Content Protection, high-bandwidth digital content protection technology) decoding processing for 4K ultra-high-definition signals, output HDMI clear stream signals (that is, unencrypted HDMI signals), and modulate them onto 60GHz carrier signals, and finally pass through the antenna Wireless transmission to TVs and other receiving display terminals, realizing the wireless transmission of full HD signals and even ultra-high definition signals, greatly improving the clarity of wireless transmission signals, and the delay is very small without affecting the fluency of video playback, which has wide application prospects .

Please refer to FIG. 1 , the HDMI wireless transmitter provided by the present invention includes an HDMI signal access module 100 , a control module 200 , a button and indicator light module 300 , a transmitting module 400 and a power supply module 500 . The HDMI signal access module 100 is connected to the control module 200, the button and indicator light module 300 and the transmitting module 400, the control module 200 is connected to the button and indicator light module 300 and the transmitting module 400, and the button and indicator light module 300 is connected to Launch module 400 . The power supply module 500 is connected to the HDMI signal access module 100 , the control module 200 , the button and indicator light module 300 and the transmitting module 400 .

The HDMI signal access module 100 is provided with at least one HDMI channel for connecting an external HDMI source device, and a power supply interface for connecting an external power adapter to provide power. In this embodiment, there are preferably four HDMI channels, namely the first HDMI channel HDMI1, the second HDMI channel HDMI2, the third HDMI channel HDMI3, and the fourth HDMI channel HDMI4, which can be respectively connected to four HDMI source devices (such as DVD, set-top boxes, game consoles, mobile phones). The HDMI signal access module 100 detects and marks the device access status and signal status of each HDMI channel in real time, and sends the device access status and signal status of each HDMI channel to the control module 200 through the first I2C bus I1. At the same time, the HDMI signal access module 100 also sends a corresponding SENSE signal to the transmitting module according to the signal state.

Wherein, the device access state is: "with device access" or "without device access". The signal state is: "signal" or "no signal". When the signal state of the HDMI channel is "signal present", the SENSE signal is a valid signal (such as high level); when the signal state is "no signal", the SENSE signal is an invalid signal (such as low level).

When the HDMI signal access module 100 detects that a certain HDMI channel "has a signal", it recognizes the HDMI channel as the current channel, and performs EDID (Extended display identification data, extended display identification data, refers to the HDMI source device connected to the HDMI channel correspondingly) Screen resolution information, including manufacturer name and serial number) data interaction, perform HDCP decryption processing on the HDMI signal input by the HDMI source device, and output the decrypted HDMI audio and video signal (that is, the HDMI clear stream signal) to the transmitting module 400 . Among them, EDID data interaction and HDCP decryption processing are existing technologies, and will not be described in detail here.

It should be understood that each HDMI channel of the HDMI signal access module 100 performs independent EDID data interaction, which can improve wireless transmission efficiency and reduce delay. When any HDMI channel has a signal, it will automatically perform and complete EDID data interaction after the first connection or power-on, and will not perform EDID data interaction again when it is subsequently set as the current channel, and directly perform HDCP decryption of the HDMI signal . Meanwhile, the HDMI signal access module 100 only performs HDCP decryption on the HDMI signal identified as the current channel. When other HDMI source devices are connected to other HDMI channels, the HDMI signal input module 100 automatically sets the last connected HDMI channel with signals as the current channel. When the connected HDMI source device is pulled out, the HDMI signal connection module 100 transmits the connected state and signal state of the device to the control module 200 in real time. If the control module 200 judges that what is pulled out is not the current channel, then the HDMI signal access module is controlled to maintain the working state of the current channel; Circularly judge the signal status of the subsequent HDMI channel, and control the HDMI signal access module to set the next "signal" HDMI channel as the current channel.

For example, when the first HDMI channel HDMI1 is connected to a DVD and has a signal input, the HDMI signal access module 100 marks it as the current channel, performs HDCP decryption processing on the HDMI signal input from the DVD, and transmits the decrypted HDMI audio and video signals to the transmitter. Module; at the same time, send the state that the first HDMI channel HDMI1 is connected to the DVD, has a signal and is the current channel, and no other devices are connected to the control module 200 . Then the second HDMI channel HDMI2 is connected to the set-top box and there is a signal input, indicating that the user needs to check the video data in the set-top box. Therefore, the HDMI signal access module 100 automatically sets the second HDMI channel HDMI2 as the current channel, and the input of the set-top box. After the signal is decrypted by HDCP, it is transmitted to the transmitting module; at the same time, the first HDMI channel HDMI1 is connected to the DVD and has a signal, the second HDMI channel HDMI2 is connected to the set-top box and has a signal and is the current channel, and other devices are not connected to this state to send to the control module 200. When the set-top box is pulled out, the HDMI signal access module 100 sends the first HDMI channel HDMI1 to connect to the DVD and there is a signal, the set-top box is pulled out for the current channel, and other devices are not connected, and this status is sent to the control module 200 . The control module 200 first judges in order whether there is equipment connected to the third HDMI channel HDMI3 and the fourth HDMI channel HDMI4 and whether there is a signal input. If not, continue to judge the first HDMI channel HDMI1. If there is a signal input, the first HDMI channel HDMI1 is set as the current channel.

When power off, the control module 200 marks the current channel as a memory channel. When the power is turned on again, the control module 200 notifies the HDMI signal access module 100 to restore the memory channel to the current channel. If the HDMI signal access module 100 detects that the current channel has no signal input, it will query the subsequent HDMI channels in sequence according to the serial number of the current channel, and set the next HDMI channel with a signal as the current channel.

In this embodiment, the control module 200 outputs the corresponding light control command through the first I2C bus I1 to control the button and the indicator light of the indicator light module 300 according to the device access status and signal status transmitted by the first I2C bus I1 state. For example, when the HDMI signal access module 100 marks a certain HDMI channel as "equipment connected" and "signal", it recognizes the HDMI channel as the current channel. The light control command controls the indicator light corresponding to the HDMI channel to always be on. The control module 200 can also control the HDMI signal access module 100 to switch HDMI channels according to the interrupt signal INT (generated by the button) sent by the button and indicator module 300 . In addition, the control module 200 also receives the abnormal information sent by the transmitting module 400 through the second I2C bus I2, and is used to reset the HDMI signal access module 100 to return to normal.

The button and indicator light module 300 is provided with at least one button, at least one indicator light and one emission light. The number of the indicator lights is adapted to the number of HDMI channels, and is used to display the signal status of the corresponding HDMI channels. The control module 200 transmits the light control command through the first I2C bus I1, and the button and indicator light module 300 controls the on-off state of the corresponding indicator light according to the received light control command. For example, when a device is connected to the HDMI channel for the first time or a button is pressed, the indicator light flashes several times. When the HDMI channel has equipment connected, there is a signal, and it is not the current channel, the indicator light keeps flashing. When the HDMI channel has device access, signal and is the current channel (that is, the HDMI signal is being transmitted), the indicator light is always on. The indicator light is off when there is equipment connected to the HDMI channel but no signal. The indicator light is off when there is no device connected to the HDMI channel.

The emission light is used to display the working state of the emission module 400 . When the transmitting module is searching for the receiving display terminal, the transmitting light flashes slowly. When the transmitting module is paired with the receiving display terminal (that is, the receiving display terminal has been searched and audio and video signals can be transmitted), the transmitting light will flash quickly. When the transmitting module is transmitting HDMI audio and video signals, the transmitting light is always on. When the transmitting module does not receive HDMI audio and video signals within the preset time, the transmitting light goes out and the transmitting module enters the sleep power-saving mode.

Each HDMI channel corresponds to a button, and the button is used to manually switch the corresponding HDMI channel. When the button and indicator light module 300 detects that a button is pressed, it outputs a corresponding interrupt signal INT to the control module 200 . The control module 200 generates a corresponding switching instruction according to the interrupt signal INT, and transmits the switching instruction to the HDMI signal access module through the first I2C bus I1. If the HDMI channel corresponding to the button has a signal, set the HDMI channel as the current channel; if the HDMI channel has no signal, the channel switching will not be performed.

The transmitting light corresponds to a reset button, which is used to manually reset the transmitting module of the wireless transmitter, so that the transmitting module returns to normal in an abnormal state. When the reset button is pressed, the button and indicator light module 300 generates a reset signal KEY_T and sends it to the transmitting module 400 to control the transmitting module 400 to perform a manual reset.

In this embodiment, the button and indicator light module 300 includes 4 indicator lights, a transmitting light and 5 buttons, that is, the first indicator light L1, the second indicator light L2, the third indicator light L3, The fourth indicator light L4, the emission light L5, the first button K1, the second button K2, the third button K3, the fourth button K4, and the reset button K5. The first key K1 corresponds to the first indicator light L1 and the first HDMI channel HDMI1. The second key K2 corresponds to the second indicator light L2 and the second HDMI channel HDMI2. The third key K3 corresponds to the third indicator light L3 and the third HDMI channel HDMI3. The fourth button K4 corresponds to the fourth indicator light L4 and the fourth HDMI channel HDMI4.

In this embodiment, when the transmitting module 400 detects that the received SENSE signal is a valid signal, it starts to receive the decrypted HDMI audio and video signal transmitted by the HDMI signal access module 100, and modulates the HDMI audio and video signal to a 60GHz carrier signal It is transmitted through the antenna and received by the receiving display terminal (such as a TV). The receiving display end receives the HDMI audio and video signal and plays it after demodulation and decoding.

The transmitting module 400 can also perform anomaly detection processing. That is, when the transmission module 400 detects that the SENSE signal is valid, but there is no HDMI audio and video signal input, the abnormal information is sent to the control module through the second I2C bus I2, and the control module controls the HDMI signal access module 100 to reset according to the abnormal information to recover normal. When the HDMI signal access module 100 detects that all its HDMI channels are in "no signal" within the preset time, that is, when the output SENSE signal is invalid within the preset time, the transmitting module enters the sleep power saving state and outputs the light control signal LED_T turns off the emission lamp L5. When any HDMI channel has "signal", that is, when the output SENSE signal is valid, the transmitting module will automatically wake up and start searching for the receiving display terminal.

During specific implementation, if the transmitting module 400 receives an effective SENSE signal, but has not received the decrypted HDMI audio and video signal, it will send abnormal information to the control module 200 through the second I2C bus I2; Control the HDMI signal access module 100 to perform automatic diagnosis to recover HDMI audio and video signal output.

In this embodiment, the power supply module 500 is used to convert the external power supply into a preset voltage (such as 5V, 3.3V, 1.0V) to supply power to the above-mentioned modules.

Please continue to refer to Figure 1 and Figure 2, with 4 HDMI channels, HDMI1, HDMI2, HDMI3, HDMI4 as shown in Figure 1. Assume that each HDMI channel corresponds to connected HDMI devices: DVD, set-top box, game console, and handheld device (such as a mobile phone). The working principle of the HDMI wireless transmitter is as follows.

Power-on stage: The power supply interface of the HDMI wireless transmitter is connected to the power adapter, and the 220V AC connected to the power adapter is converted by the power supply module 500 into 5V, 3.3V, and 1.0V voltages to supply power for each module in the HDMI wireless transmitter, and the transmitting module start operation.

When all HDMI channels are not connected to external devices, the HDMI signal access module 100 notifies the control module 200 through the first I2C bus I1 that the device access status of all HDMI channels is "no device access". Then the control module 200 controls the button and the indicator light module 300 through the first I2C bus I1, so that the indicator lights L1 to L4 are off; and the HDMI signal access module 100 outputs an invalid SENSE signal (low level) to the transmitting module 400 . The transmitting module 400 starts to search for the receiving display terminal (such as a TV) and perform pairing, and at the same time outputs a slow frequency pulse signal LED_Ts to the button and indicator module 300 to control the transmitting light L5 to blink slowly. After the transmitting module 400 is paired with the receiving display terminal, the transmitting module 400 transmits the fast-frequency pulse signal LED_Tf to the button and indicator module 300 to make the transmitting light L5 flash quickly.

Working stage: When any HDMI source device is connected, such as DVD connected to the first HDMI channel HDMI1. The HDMI signal access module 100 automatically marks the first HDMI channel HDMI1 as "device connected", and notifies the control module 200 through the first I2C bus I1. The control module 200 controls the button and indicator light module 300 through the first I2C bus I1 to make the first indicator light L1 blink. If no signal is output from the DVD, the HDMI signal access module 100 automatically marks the signal state of the first HDMI channel HDMI1 as “no signal” and notifies the control module 200 . The control module 200 controls the first indicator light L1 to blink for a preset number of times (for example, 3 times) and then go out. If there is a signal output from the DVD, the HDMI signal access module 100 marks the first HDMI channel HDMI1 as "signal", and notifies the control module 200 through the first I2C bus I1 after exchanging EDID data with the connected DVD. The control module 200 controls the button and indicator module 300 to make the first indicator light L1 always on and the first HDMI channel HDMI1 to be the current channel. The HDMI signal access module 100 outputs a valid SENSE signal (high level at this time) to the transmitting module 400 , further performs HDCP decryption processing on the HDMI signal output from the DVD, and outputs the decrypted HDMI audio and video signals to the transmitting module 400 . The transmitting module 400 encodes the received HDMI audio and video signal and modulates it onto a 60GHz wireless carrier, and transmits it to the receiving display terminal through the antenna.

When the second device is connected, such as a set-top box connected to the second HDMI channel HDMI2. The HDMI signal access module 100 automatically marks the second HDMI channel HDMI2 as "device access", and notifies the control module 200 through the first I2C bus I1. The control module 200 controls the button and indicator light module 300 through the first I2C bus I1 to make the second indicator light L2 blink. If there is no signal output from the set-top box, the HDMI signal access module 100 automatically marks the signal state of the second HDMI channel HDMI2 as “no signal” and notifies the control module 200 . The control module 200 controls the second indicator light L2 to blink for a preset number of times (for example, 3 times) and then go out. The current working states of the first HDMI channel HDMI1, the first indicator light L1 and the transmitting module 400 remain unchanged, and the first HDMI channel HDMI1 is still the current channel. If the set-top box has signal output: the HDMI signal access module automatically marks the second HDMI channel HDMI2 as "signal", and performs and completes EDID data interaction with the connected set-top box, and notifies the control module through the first I2C bus I1, so that the second The indicator light L2 is always on and the first indicator light L1 keeps flashing, the second HDMI channel HDMI2 automatically switches to the current channel, and the SENSE signal remains valid; further, HDCP decryption is performed on the HDMI signal output by the set-top box, and the decrypted HDMI audio is output The video signal is sent to the transmitting module 400. Similarly, the transmitting module 400 encodes and modulates the received HDMI audio and video signal (from the set-top box) to a 60GHz wireless carrier, and transmits the decrypted HDMI audio and video signal through the antenna.

When the third or fourth device is connected, for example, the game console connects to the third HDMI channel HDMI3, and the handheld device connects to the fourth HDMI channel HDMI4. The working principle of the HDMI wireless transmitter is the same as above, and will not be repeated here.

If the power adapter is pulled out, that is, when the power is off, the second HDMI channel HDMI2 is marked as a memory channel. When the power is turned on again, the memory channel (that is, the second HDMI channel HDMI2) is automatically set as the current channel, so that the second indicator light L2 is always on. The set-top box connected to the second HDMI channel HDMI2 completes EDID data interaction and HDCP decryption with the HDMI wireless transmitter, and transmits it wirelessly after modulation. At the same time, the DVD connected to the first HDMI channel HDMI1 (when there is a signal) also completes the EDID data interaction, and the first indicator light L1 flashes.

It should be understood that the intelligent extraction, channel selection, and wireless transmission functions of the HDMI wireless transmitter; if the current channel is not pulled out, the wireless transmission state of the current channel is maintained; , then the signal status of the subsequent channels will be judged sequentially, and the next channel with "signal" will be set as the current channel.

Please continue to refer to FIG. 1 and FIG. 2 , in a preferred application embodiment, it is assumed that the first HDMI channel HDMI1 is connected to a DVD, has a signal, and is not the current channel. The second HDMI channel HDMI2 is connected to the set-top box, has signal, and is the current channel. The third HDMI channel HDMI3 is connected to the game console, but there is no signal. No device is connected to the fourth HDMI channel HDMI4, and the fourth indicator light L4 is off.

When the HDMI source device is pulled out, the working principle of the HDMI wireless transmitter is:

If the DVD is unplugged, the HDMI signal access module 100 notifies the control module 200 through the first I2C bus I1, and the control module 200 judges that the first HDMI channel HDMI1 is not the current channel, and further notifies the button and indicator light module 300 to use the first I2C bus I1. The first indicator light L1 goes out.

If the set-top box is unplugged, the HDMI signal access module 100 notifies the control module 200 through the first I2C bus I1. The control module 200 determines that the second HDMI channel HDMI2 is the current channel, and further informs the button and indicator light module 300 to turn off the second indicator light L2 through the first I2C bus I1, and sequentially loops to determine the subsequent channels: the control module 200 passes through the first I2C bus I1 learns the status of other HDMI channels of the HDMI signal access module 100, first learns the third HDMI channel HDMI3 "no signal" in order, then learns the fourth HDMI channel HDMI4 "no signal", and polls in order to learn the first HDMI channel HDMI1 "signal": Immediately send a switching command through the first I2C bus I1 to make the HDMI signal access module 100 switch the first HDMI channel HDMI1 to the current channel, and send commands to the button and indicator light module 300 through the first I2C bus I1 Make the first indicator light L1 always on. The HDMI signal access module 100 no longer performs EDID data interaction, and directly performs HDCP decryption processing on the HDMI signal (sourced from DVD) input by the first HDMI channel HDMI1, and then lets the transmitting module modulate and transmit it.

If the game console is unplugged, because there is no signal input and the corresponding HDMI channel is not the current channel, the working state of the HDMI wireless transmitter remains unchanged.

If the power adapter is unplugged, the second HDMI channel HDMI2 is marked as a memory channel. After pulling out the set-top box, when the power is turned on again, although the memory channel (that is, the second HDMI channel HDMI2) will be restored to the current channel. However, since there is no signal input, the subsequent HDMI channels are judged sequentially, and only the first HDMI channel HDMI1 has a signal, so the first HDMI channel HDMI1 is set as the current channel.

Based on the above-mentioned application embodiment, the working principle of the buttons in the HDMI wireless transmitter is:

When detecting that the second button K2 is pressed, the button and indicator module sends an interrupt INT signal to the control module (in which an instruction to switch the second HDMI channel HDMI2 to the current channel is loaded). The control module generates an interrupt, judges that the second HDMI channel HDMI2 is the current channel, and exits the interrupt. The working status of the HDMI wireless transmitter remains unchanged.

When detecting that the third button K3 is pressed, the button and indicator module sends an interrupt INT signal to the control module (in which an instruction to switch the third HDMI channel HDMI3 as the current channel is loaded). The control module generates an interrupt, judges that the third HDMI channel HDMI3 is not the current channel, and learns that the third HDMI channel HDMI3 of the HDMI signal access module "has device access" through the first I2C bus I1, then through the first I2C bus I1 to the button and The indicator light module sends a command to make the third indicator light L3 blink, and further learns that the third HDMI channel HDMI3 has "no signal", then makes the third indicator light L3 go out, and exits the interruption. The second HDMI channel HDMI2 continues to be the current channel and the status remains unchanged.

When it is detected that the fourth button K4 is pressed, its processing method is similar to that of the third button K3, and the fourth HDMI channel HDMI4 does not perform a switching operation when no device is connected, and maintains the current state.

When detecting that the first button K1 is pressed, the button and indicator module sends an interrupt INT1 signal to the control module (in which an instruction to switch the first HDMI channel HDMI1 to the current channel is loaded); the control module generates an interrupt. Judging that the first HDMI channel HDMI1 is not the current channel, and knowing that the first HDMI channel HDMI1 "has device access" through the first I2C bus I1, then send instructions to the button and indicator light module through the first I2C bus I1 to make the first indicator light L1 Blinking, further knowing that the first HDMI channel HDMI1 "has a signal", then immediately send a control command through I2C to let the HDMI signal access module switch the first HDMI channel HDMI1 to the current channel, and send buttons and indicators through the first I2C bus I1 The module sends an instruction to make the second indicator light L2 go out, the first indicator light L1 is always on, and exit the interrupt. The HDMI signal access module will no longer perform EDID data interaction, and directly perform HDCP decryption processing on the HDMI signal output by the DVD connected to the first HDMI channel HDMI1, and let the transmitting module transmit it.

Based on the foregoing HDMI wireless transmitter, an embodiment of the present invention further provides a signal processing method for the HDMI wireless transmitter. Please refer to Figure 3, the signal processing method includes:

S100. The HDMI signal access module identifies the current channel according to the device access state and signal state of the HDMI channel, and performs HDCP decryption processing on the HDMI signal input by the current channel to output the HDMI audio and video signal to the transmitting module;

S200. The transmitting module modulates the HDMI audio and video signal onto a preset carrier signal and transmits it;

S300. The control module controls the on and off states of the buttons and the indicator lights of the indicator light module according to the device access state and the signal state.

For details of the steps S100-S300, please refer to the above-mentioned embodiment of the HDMI wireless transmitter, which will not be repeated here.

In summary, the wireless transmitter provided by the present invention has the following technical effects:

Multiple HDMI source devices can be connected at the same time, automatically detect and memorize the connection status and signal status of HDMI source devices for each HDMI channel, and can automatically set the last connected HDMI channel with signal as the current channel; conduct HDCP decryption processing on the input HDMI signal of the current channel, output HDMI audio and video signals and modulate them onto the 60GHz carrier signal, and wirelessly transmit them to the receiving display terminal through the antenna; realize the wireless transmission of full HD signals or even ultra-high definition signals, Greatly improve the clarity of wireless transmission signals, and the delay is very small.

It can intelligently select the current channel, and the HDMI channel with signal can be automatically switched to the current channel, and the "no signal" channel will not be switched; it can also be manually switched by pressing the button; and the button can be displayed by the on and off status of the indicator light Operation execution status and HDMI channel status.

Each HDMI channel performs independent EDID data interaction to improve wireless transmission efficiency and reduce delay. When any HDMI channel has a signal, it will automatically perform and complete the EDID data interaction after the first connection or power-on, and will not repeat the EDID data interaction when it is subsequently selected as the current channel, and directly perform HDCP decryption of the HDMI signal , to save signal processing transmission time.

If the HDMI channel corresponding to the unplugged HDMI source device is not the current channel, the wireless transmission status of the current channel remains unchanged. If the current channel is pulled out, the signal status of the subsequent channels will be judged sequentially, and the next "signal" HDMI channel will be set as the current channel, which simplifies the switching operation and saves user time.

The transmitter module has an intelligent sleep and wake-up mode that can save power and improve search and transmission efficiency; it also has anomaly detection processing that can reduce the failure rate of the HDMI wireless transmitter and improve the reliability of the HDMI wireless transmitter.

The HDMI wireless transmitter is stable and reliable, occupies less resources, and has low cost, and can be widely used in various electronic products.

It can be understood that those skilled in the art can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention, and all these changes or replacements should belong to the protection scope of the appended claims of the present invention.

Claims (9)

1. A HDMI wireless transmitter, used to realize the wireless communication between HDMI source equipment and receiving display end, is characterized in that, comprises: HDMI signal access module, control module, button and indicator light module and transmission module; HDMI signal access The module includes at least one HDMI channel for connecting an external HDMI source device; The HDMI signal access module identifies the current channel according to the device access status and signal status of the HDMI channel, automatically sets the HDMI channel that was last connected and has a signal as the current channel, and performs HDCP decryption processing on the HDMI signal input by the current channel Output HDMI audio and video signals to the transmitting module; the transmitting module modulates the HDMI audio and video signals onto the preset carrier signal and transmits; the control module controls the on and off of the buttons and the indicator lights of the indicator module according to the device access status and signal status state; The HDMI signal access module is also used to detect that any HDMI channel has a signal, it will automatically perform and complete the EDID data interaction after the first connection or power-on; Perform EDID data interaction and directly perform HDCP decryption of HDMI signals; each HDMI channel performs independent EDID data interaction; The transmitting module receives a valid SENSE signal, but has not received the decrypted HDMI audio and video signal, and sends abnormal information to the control module; the control module controls the HDMI signal access module to perform automatic diagnosis according to the abnormal information to restore the HDMI audio and video signal output ; The button and indicator light module includes at least one button, and each HDMI channel corresponds to a button, and the button outputs an interrupt signal to the control module, and the control module controls the HDMI signal access module to switch the corresponding HDMI channel according to the interrupt signal; if When the HDMI channel corresponding to the button has a signal, the HDMI channel is set as the current channel; if the HDMI channel has no signal, the channel switching will not be performed. 2. The HDMI wireless transmitter according to claim 1, wherein the control module is also used for detecting that the HDMI channel corresponding to the HDMI source device is not the current channel when the connected HDMI source device is pulled out , control the HDMI signal access module to maintain the current working state of the channel unchanged; if the detection is the current channel, then use the current channel as the basis to sequentially judge the signal status of the subsequent HDMI channel, and control the HDMI signal access module to connect the next available channel The HDMI channel of the signal is set as the current channel. 3. The HDMI wireless transmitter according to claim 1, wherein the control module is also used to mark the current channel as a memory channel when the power is off, and to control the HDMI signal access module to store the memory channel when the power is turned on again. Revert to current channel. 4. The HDMI wireless transmitter according to claim 1, wherein the control module is also used to control the HDMI signal access module to switch the HDMI channel according to the interrupt signal sent by the button and indicator light module. 5. The HDMI wireless transmitter according to claim 1, wherein the button and indicator light module also includes at least one indicator light and a transmitting light; The number of the indicator lights is adapted to the number of the HDMI channels, and is used to display the signal status of the corresponding HDMI channels; The emitting light is used to display the working state of the emitting module. 6. The HDMI wireless transmitter according to claim 5, wherein the emitting light corresponds to a reset button, and the reset button generates a reset signal to the transmitting module, and the transmitting module resets according to the reset signal. 7. The HDMI wireless transmitter according to claim 1, wherein the transmitting module is also used to send abnormal information to the control module when detecting that the current channel has no HDMI audio and video signal input, and the control module transmits abnormal information according to the abnormal information. Control the HDMI signal access module to reset to return to normal. 8. HDMI wireless transmitter according to claim 1, is characterized in that, also comprises power supply module, is used for converting external power supply into preset voltage for HDMI signal access module, control module, button and indicator light module and transmitting Module power supply. 9. A signal processing method of an HDMI wireless transmitter, comprising: The HDMI signal access module identifies the current channel according to the device access status and signal status of the HDMI channel, automatically sets the HDMI channel that was last connected and has a signal as the current channel, and performs HDCP decryption processing on the HDMI signal input by the current channel Output HDMI audio and video signals to the transmitter module; The transmitting module modulates the HDMI audio and video signal onto a preset carrier signal and transmits it; The control module controls the on-off status of the buttons and the indicator lights of the indicator module according to the equipment access status and signal status; The HDMI signal access module also detects that when any HDMI channel has a signal, it will automatically perform and complete the EDID data interaction after the first access or power-on; it will not repeat the EDID data when it is subsequently selected as the current channel Interactive and direct HDCP decryption of HDMI signals; each HDMI channel performs independent EDID data interaction; The transmitting module receives a valid SENSE signal, but has not received the decrypted HDMI audio and video signal, and sends abnormal information to the control module; the control module controls the HDMI signal access module to perform automatic diagnosis according to the abnormal information to restore the HDMI audio and video signal output ; The button and indicator light module includes at least one button, and each HDMI channel corresponds to a button, and the button outputs an interrupt signal to the control module, and the control module controls the HDMI signal access module to switch the corresponding HDMI channel according to the interrupt signal; if When the HDMI channel corresponding to the button has a signal, the HDMI channel is set as the current channel; if the HDMI channel has no signal, the channel switching will not be performed.