TW201438415A - Video and audio transmission apparatus and light emitting module and light receiving module thereof - Google Patents

Abstract

A video and audio transmission apparatus including a power line communication module, an optical emitting module, and an optical receiving module is disclosed. The optical emitting module includes an independent-band signal emitting unit. The optical receiving module includes an independent-band signal detecting unit. The power line communication module provides a data to a power line to combine with a power line signal into a composite power line signal. The optical emitting module drives an illuminant to emit an optical signal according to the data. The optical receiving module receives and reverts the optical signal and converts it into an audio data or a video data. When the composite power line signal meets a specific condition, the independent-band signal emitting unit emits a wireless signal including a synchronization signal. The independent-band signal detecting unit receives the synchronization signal to synchronize communication between the optical receiving module and optical emitting module.

Description

Video transmission device, optical transmitting module and optical receiving module thereof

The invention relates to audio and video transmission, in particular to an audio and video transmission device capable of effectively integrating Power Line Communication (PLC) technology and Visible Light Communication (VLC) technology, and a light emitting module and an optical receiving module thereof. group.

In general, power line communication (PLC) technology refers to the use of existing power lines to transmit data or information in a digital signal processing method. Power line communication technology uses a low frequency (50~60 Hz) power line to transmit broadband network messages. Compared to ADSL, which uses telephone lines, the application of power line communication generally uses fiber-optic lines or cable TV lines. The advantage of using power line communication technology is that there is no need to re-route the network line, and the area covered by the power line is far wider than that of other carriers.

As for the visible light communication (VLC) technology, a wireless communication technology uses visible light having a frequency between 400 THz and 800 THz (that is, a wavelength between 375 nm and 780 nm) as a communication medium. For example, if ordinary fluorescent lamps are used for visible light communication, the transmission speed is 10 kbit/sec; when using LED lamps for visible light communication, the transmission speed is 500 Mbit/sec. Visible light communication can travel up to 1 to 2 kilometers. Its biggest feature is the combination of solid state lighting technology.

Although power line communication technology and visible light communication technology have their own advantages, however, in terms of audio and video transmission applications, especially for indoor audio and video transmission or video broadcasting applications, there is still a lack of an audio and video transmission system and technology to effectively integrate power line communication. Technology and visible light communication technology to achieve audio and video transmission. Therefore, the present invention provides an audio-visual transmission device, a light-emitting module thereof and a light-receiving module, to solve the above problems encountered in the prior art.

According to an embodiment of the invention, an audiovisual transmission device is provided. In this embodiment, the audio and video transmission device includes a power line communication module, a light emitting module, and a light receiving module. The power line communication module is used to provide data to the power line to be combined with the power line signal into a composite power line signal, wherein the data includes sound data or image data. The light emitting module is coupled to the power line. The light emitting module comprises a transmitting end power line communication unit, an illumination driving unit, an illuminant, a detecting unit and an independent frequency band signal transmitting unit. The transmitting power line communication unit is used to retrieve data from the composite power line signal. The illumination driving unit is coupled to the transmitting end power line communication unit for providing the driving signal according to the data. The illuminant is coupled to the illuminating driving unit for emitting an optical signal according to the driving signal. The independent frequency band signal transmitting unit is coupled to the detecting unit. The light receiving module comprises a light receiving unit, a receiving end power line communication unit, a video and audio restoration unit and an independent frequency band signal detecting unit. The light receiving unit is configured to receive the light signal emitted by the illuminant. The receiving end power line communication unit is coupled to the light receiving unit for reducing the optical signal to data. The AV restore unit is coupled to the receiving end power line communication unit for converting the data into sound data or image data. When the detecting unit detects that the composite power line signal meets certain conditions, the detecting unit controls the independent frequency band signal transmitting unit to send a wireless signal including the synchronous signal. The independent band signal detecting unit of the light receiving module receives the synchronous signal in the wireless signal, so that the light receiving module can synchronize with the light transmitting module.

In an embodiment, the light receiving module is a portable electronic device.

In an embodiment, the light emitting module is disposed on the lamp holder or the bulb.

In an embodiment, the wireless signal emitted by the independent frequency band signal transmitting unit is infrared light, polarized light or wireless radio frequency.

In one embodiment, the specific condition is that the composite power line signal conforms to a current zero-phase trigger (Zero-cross).

In one embodiment, the power line communication module receives data from the source of the video through the network.

In an embodiment, the illuminant is a visible light emitting diode.

Another embodiment of the present invention is a light emitting module. In this embodiment, the light emitting module is applied to the transmission of image or sound data. The light emitting module comprises a power line communication unit, an illumination driving unit, an illuminant, a detecting unit and an independent band signal transmitting unit. The power line communication unit is coupled to the power line for obtaining data from the composite power line signal transmitted by the power line, wherein the data includes image data or sound data. The illumination driving unit is coupled to the power line communication unit for providing the driving signal according to the data. The illuminant is coupled to the illuminating driving unit for emitting an optical signal according to the driving signal. The detecting unit is configured to detect whether the composite power line signal meets certain conditions. The independent frequency band signal transmitting unit is coupled to the detecting unit. When the detecting unit detects that the composite power line signal meets certain conditions, the independent frequency band signal transmitting unit sends a wireless signal including the synchronous signal to the light receiving module, so that the light receiving module Synchronization with the light emitting module.

Another embodiment of the present invention is a light receiving module. In this embodiment, the light receiving module is applied to the transmission of images or sounds. The light receiving module comprises a light receiving unit, a power line communication unit, a video and audio restoration unit and an independent frequency band signal detecting unit. The light receiving unit is configured to receive the light signal emitted by the illuminant. The power line communication unit is coupled to the light receiving unit for extracting data from the optical signal. The AV restore unit is coupled to the power line communication unit for restoring the data to image data or sound data. The independent frequency band signal detecting unit is configured to receive the synchronization signal in the wireless signal sent by the light emitting module, so as to synchronize the communication between the light receiving module and the light emitting module. The wireless signal including the synchronous signal is sent by the light emitting module when the specific condition is met.

Compared with the prior art, the audio-visual transmission device and the optical transmitting module and the optical receiving module thereof according to the present invention can effectively integrate the power line communication technology and the visible light communication technology for video and audio transmission, and have the following advantages and effects:

(1) It can be applied to the transmission of indoor audio and video, especially for personal audio-visual navigation of exhibition venues or museums, indoor video broadcasting, simultaneous translation of multi-language lecture halls, and high-confidential conference rooms.

(2) It is only necessary to use the general power line communication chipset with visible light communication technology to realize the transmission of indoor audio and video, and the cost is relatively low.

(3) In order to allow the data emitted by the optical transmitting module and the data received by the optical receiving module Synchronizing with each other, the audio-visual transmission device of the present invention provides a current zero-phase sequence trigger signal to the light receiving module through another independent frequency band signal (for example, low-cost infrared light), so that the light receiving module and the light emitting module are Communication can be synchronized.

(4) The light receiving module of the present invention can be set in a mobile communication device (such as a smart phone or a wireless earphone) according to actual needs, which not only increases the flexibility of use but also facilitates the use of the user.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

PL‧‧‧Power Line

TX, TX1~TX3‧‧‧ light emitting module

MAC‧‧‧Media Access Control Circuit

10‧‧‧ front-end circuit

12‧‧‧DC current generation circuit

14‧‧‧Voltage-to-current amplifier

15‧‧‧ processor

16‧‧‧current addition circuit

17‧‧‧White LED

18‧‧‧Detection unit

19‧‧‧Infrared LED

S _AV ‧‧‧Composite power line signal

I _DC ‧‧‧ DC current signal

I _AC ‧‧‧AC current signal

S _DR ‧‧‧Drive Signal

S _CT ‧‧‧Control signal

S _syn ‧‧‧synchronous signal

S _W ‧‧‧Optical signal

RX, RX1~RX3‧‧‧ light receiving module

20‧‧‧Light receiving unit

22‧‧‧ front-end circuit

24‧‧‧Infrared sensor

26‧‧‧Detection unit

28‧‧‧Processor

AVS‧‧‧ audio source

PLC‧‧‧Power Line Communication Module

DTU‧‧‧Detection unit

IRLED‧‧‧Infrared LED

DCG‧‧‧DC power generation circuit

BPF‧‧‧ bandpass filter

TCA‧‧‧voltage to current amplifier

40‧‧‧current addition circuit

42‧‧‧White light emitting diode

44‧‧‧ front-end circuit

46‧‧‧Media access control circuit

MCU‧‧‧ processor

PGA‧‧‧Programmable Gain Amplifier

LPF‧‧‧ low pass filter

ADC‧‧‧AC-DC Converter

PHY‧‧‧ physical layer

MAC‧‧‧Media Access Controller

CLK‧‧‧ clock unit

DAC‧‧‧DC-AC Converter

PHS‧‧‧Light receiving unit

50‧‧‧ front-end circuit

IRS‧‧‧Infrared Sensor

52‧‧‧Media access control circuit

CPU‧‧‧ processor

ZCD‧‧‧Zero Current Detector

FIG. 1A is a functional block diagram showing an embodiment of an optical transmitting module TX coupled to a power line PL.

FIG. 1B is a functional block diagram showing another embodiment of the light emitting module TX coupled to the power line PL.

Figure 2 is a functional block diagram showing an embodiment of the light receiving module RX.

Figure 3 is a schematic view showing an embodiment of the video and audio transmission device of the present invention.

FIG. 4 is a schematic diagram showing the detailed circuit structure of an embodiment of the optical transmitting module TX.

FIG. 5 is a schematic diagram showing the detailed circuit structure of an embodiment of the light receiving module RX.

A preferred embodiment of the present invention is an audiovisual transmission device. In this embodiment, the video transmission device includes a light emitting module and a light receiving module. In fact, the light emitting module can be disposed in the lamp holder or the light bulb; the light receiving module can be any type of portable electronic device, such as a smart phone, a tablet computer or a wireless earphone, but not limited thereto.

Please refer to FIG. 1A. FIG. 1A is a functional block diagram showing an embodiment of a light emitting module TX coupled to a power line PL. As shown in FIG. 1A, the optical transmitting module TX includes a front end circuit 10, a medium access control circuit MAC, a DC current generating circuit 12, and a voltage-to-current discharge. The amplifier 14, the current adding circuit 16, the processor 15, the white LED 17, the detecting unit 18, and the infrared LED 19. The front end circuit 10 and the medium access control circuit MAC constitute a transmitting end power line communication unit; the direct current generating circuit 12, the voltage to current amplifier 14 and the current adding circuit 16 constitute an illumination driving unit; the white LED 17 may also be any other luminous body; The infrared LED 19 can also be any independent frequency band signal transmitting unit that emits a wireless signal (infrared, polarized light or radio frequency), and is not limited by this example.

The power line PL is coupled to the front end circuit 10 and the DC current generating circuit 12 respectively; the front end circuit 10 is coupled to the medium access control circuit MAC and the detecting unit 18; the medium access control circuit MAC is coupled to the voltage to current amplifier 14 and the processor, respectively. The DC current generating circuit 12 and the voltage-to-current amplifier 14 are both coupled to the current adding circuit 16; the current adding circuit 16 is coupled to the white LED 17; and the detecting unit 18 is coupled to the infrared LED 19.

In this embodiment, since the power line PL is coupled to the front end circuit 10, the detecting unit 18, and the DC current generating circuit 12, the composite power line signal S _AV transmitted by the power line PL is transmitted to the front end circuit 10, the detecting unit 18, and DC current generating circuit 12. In one embodiment, the composite power line signal S _AV is an AC voltage signal having a specific operating frequency, which carries data belonging to a high frequency signal. The operating frequency is not limited, and is generally 60 Hz. The front end circuit 10 is configured to perform gain filtering on the composite power line signal S _AV , and then the media access control circuit MAC extracts data from the gain filtered signal. Among them, the information includes video data or sound data. The DC current generating circuit 12 supplies a DC current signal I _DC to the current adding circuit 16 based on the composite power line signal S _AV .

The voltage-to-current amplifier 14 is configured to convert the data extracted by the media access control circuit MAC into an alternating current signal I _AC and output it to the current adding circuit 16 . When the current adding circuit 16 receives the DC current signal I _DC and the AC current signal I _AC from the DC current generating circuit 12 and the voltage to current amplifier 14, respectively, the current adding circuit 16 couples the DC current signal I _DC to the AC current signal I _{AC .} It drives the signal S _DR and outputs it to the white LED 17. The white LED 17 will emit an optical signal S _W according to the driving signal S _DR . Since the driving signal S _DR is a combination of a direct current signal and an analog alternating current signal, the illuminating signal of the white LED 17 changes continuously and gradually with the change of the alternating current signal.

The detecting unit 18 is configured to detect a specific condition on the composite power line signal S _AV as a basis for synchronizing signals with the light receiving module RX. In this embodiment, the signal corresponding to the data is carried on the AC voltage signal. Therefore, the specific condition is based on the current zero phase sequence of the AC voltage signal as the basis for signal synchronization. It should be noted that although the composite power line signal S _AV is a composite signal composed of a power signal and a data signal, the presence of the data signal can be regarded as a noise for the detecting unit 18, and thus does not affect the zero phase sequence triggering. (Zero-cross) detection of the time point; however, in another embodiment, before the detecting unit 18 or inside the detecting unit 18, a filter for filtering the data signal can be set, which is a person skilled in the art. It can be set as needed, and is not intended to limit the spirit of the invention. When the detecting unit 18 detects that the composite power line signal S _AV meets the specific condition (for example, current zero phase sequence trigger), the detecting unit 18 outputs the control signal S _CT to the infrared LED 19 to control the infrared LED 19 to emit the synchronization signal S. _Syn wireless signal. When the detecting unit 18 does not detect that the composite power line signal S _AV meets certain conditions (for example, current zero phase sequence trigger), the infrared LED 19 does not emit a wireless signal including the synchronization signal S _syn .

Referring to FIG. 1B, FIG. 1B is a functional block diagram showing another embodiment of the optical transmitting module TX coupled to the power line PL. The difference between the first embodiment and the first embodiment is that the detection unit 18 is disposed in the front end circuit 10 and coupled to the infrared LED 19, and the detecting unit 18 in the first embodiment is disposed on the front end circuit 10. Between the infrared LED and the 19th. However, both are used to detect whether the composite power line signal S _AV meets the current zero phase sequence trigger to selectively control the infrared LED 19 to emit a wireless signal including the synchronization signal S _syn .

Next, please refer to FIG. 2, which is a functional block diagram showing an embodiment of the light receiving module RX. As shown in FIG. 2, the light receiving module RX includes a light receiving unit 20, a front end circuit 22, an infrared sensor 24, a detecting unit 26, a medium access control circuit MAC, and a processor 28. The front end circuit 22 and the medium access control circuit MAC constitute a receiving end power line communication unit. The optical receiving unit 20 is coupled to the front end circuit 22; the infrared sensor 24 is coupled to the detecting unit 26; the front end circuit 22 and the detecting unit 26 are coupled to the medium access control circuit MAC; and the medium access control circuit MAC is coupled to the processor. 28.

According to the foregoing FIG. 1A or FIG. 1B, when the white LED 17 of the light emitting module TX emits the optical signal S _W , the light receiving unit 20 of the light receiving module RX in FIG. 2 will receive the optical signal S _W and transmit After the front end circuit 22 performs gain filtering on the optical signal S _W by the front end circuit 22, the medium access control circuit MAC obtains data from the gain-filtered optical signal S _W and outputs the data to the processor 28. The processor 28 includes an audio/video reproduction unit (not shown) for outputting the data to image data or sound data for output.

When the detecting unit 26 detects that the wireless signal received by the infrared sensor 24 includes the synchronization signal S _syn , the detecting unit 26 outputs the synchronization signal S _syn to the processor 28 through the medium access control circuit MAC to The communication between the light receiving module RX and the light emitting module TX can be synchronized. By synchronizing the signal S _syn , the detecting unit 26 can correctly judge the timing of receiving the data.

Please refer to FIG. 3, which is a schematic diagram showing an embodiment of the audio-visual transmission device of the present invention. As shown in FIG. 3, it is assumed that the audio-visual transmission device is used in an indoor environment, and the audio-visual transmission device includes a power line communication module PLC, a power line PL, an optical transmission module TX1~TX3, and an optical receiving module RX1~RX3. The power line communication module PLC is coupled to the power line PL that has been originally installed in the room, and the power line PL is coupled to the light emitting modules TX1~TX3 respectively disposed on different lamp holders or bulbs.

The power line communication module PLC can receive data including sound data or video data in a wired or wireless manner through a network or a cable from a video source AVS (for example, a notebook computer or a video player, but not limited thereto). The power line signal is combined with the power line signal into a composite power line signal S _AV , and then loaded onto the power line PL, and the composite power line signal S _{AV is} transmitted by the power line PL to the light emitting modules TX1 to TX3, respectively.

The operation of the light emitting modules TX1~TX3 is to receive the composite power line signal S _AV from the power line PL and output different optical signals S _W as shown in FIG. 1A or FIG. 1B respectively. When the light emitting modules TX1~TX3 detect that the composite power line signal S _AV meets certain conditions (for example, current zero phase sequence trigger), the light emitting modules TX1~TX3 will send a wireless signal including the synchronization signal S _syn .

It is assumed that different users respectively wear (or carry) the light receiving modules RX1~RX3 in the signal transmitting range of the light emitting modules TX1~TX3, that is, the light receiving module RX1 is located near the lower side of the light emitting module TX1. The light receiving module RX2 is located near the lower side of the light emitting module TX2 and the light receiving module RX3 is located near the lower side of the light emitting module TX3. The operation of the light receiving module RX1~RX3 is as shown in FIG. 2, and different optical signals S _{W are} received from the light emitting modules TX1~TX3 and restored to the original sound data or image data for output. Each user wearing (or carrying) the light receiving modules RX1 to RX3 respectively listens to the sound data or views the image data.

Therefore, it is assumed that the composite power line signal S _AV transmitted by the power line PL to each of the light emitting modules TX1 to TX3 has different sound data or image data, and each user standing under the different light emitting modules TX1~TX3 can Hear different sounds or see different images.

For example, in the exhibition venue, assume that different visitors wear wireless navigation headphones (light receiving modules) RX1 ~ RX3, as shown in Figure 3, when visitors wearing wireless navigation headphones RX1 come When the light emitting module TX1 is under the light, the wireless navigation earphone RX1 will receive the light signal emitted by the light emitting module TX1, and restore the voice introduction of the exhibit under the light emitting module TX1 from the optical signal. Information to be broadcast to visitors to listen to. Similarly, when a visitor wearing the wireless navigation headset RX2 walks under the light emitting module TX2, the wireless navigation headset RX2 will receive the optical signal emitted by the light emitting module TX2 and restore it from the optical signal. The voice introduction information about the exhibits located under the light emitting module TX2 is broadcasted to the listener; when the visitor wearing the wireless navigation headset RX3 walks under the light emitting module TX3, the wireless navigation headset The RX3 will receive the optical signal from the optical transmitting module TX3, and restore the audio introduction information about the exhibit located under the optical transmitting module TX3 from the optical signal for broadcast to the listener.

Of course, once the visitor wearing the wireless navigation headset RX3 walks under the light emitting module TX3 and walks under the light emitting module TX2, the wireless navigation headset RX3 is located in the light emitting module TX2. Within the transmitting range, the wireless navigation headset RX3 will instead receive the optical signal from the optical transmitting module TX2, and restore the voice introduction information about the exhibit located under the optical transmitting module TX2 from the optical signal. To broadcast to the audience to listen. The rest of the situation can be deduced by analogy, and will not be described here.

Please refer to FIG. 4 , which is a schematic diagram showing the detailed circuit structure of an embodiment of the optical transmitting module TX. As shown in FIG. 4, the light emitting module TX includes a detecting unit DTU, an infrared light emitting diode IRLED, a DC power generating circuit DCG, a band pass filter BPF, a voltage to current amplifier TCA, a current adding circuit 40, and white light emitting. The diode 42 and the front end circuit 44 Media access control circuit 46 and processor MCU. The front end circuit 44 includes a programmable gain amplifier PGA and a low pass filter LPF; the medium access control circuit 46 includes an AC-DC converter ADC, a physical layer PHY, a media access controller MAC, a clock unit CLK, and a DC. AC converter DAC.

In this embodiment, the composite power line signal S _AV transmitted by the power line PL is respectively transmitted to the detecting unit DTU, the DC power generating circuit DCG and the band pass filter BPF; and the detecting unit DTU is coupled to the infrared light emitting diode. The IRLED; the bandpass filter BPF is coupled to the front end circuit 44, which includes a programmable gain amplifier PGA and a low pass filter LPF. In this embodiment, the bandpass filter BPF is coupled to the programmable gain amplifier PGA, the programmable gain amplifier PGA is coupled to the low pass filter LPF; the low pass filter LPF is coupled to the AC-DC converter ADC; AC-DC conversion The ADC is coupled to the physical layer PHY; the physical layer PHY is coupled to the media access controller MAC clock unit CLK; the media access controller MAC is coupled to the clock unit CLK and the processor MCU; and the DC-AC converter DAC is coupled to The physical layer PHY is connected to the voltage-to-current amplifier TCA; the DC power generating circuit DCG and the voltage-to-current amplifier TCA are both coupled to the current adding circuit 40; the current adding circuit 40 is coupled to the white light emitting diode 42 and is illuminated by white light. The polar body 42 emits an optical signal S _W . When the detecting unit DTU detects that the composite power line signal S _AV meets certain conditions (for example, current zero phase sequence triggering), the detecting unit DTU controls the infrared light emitting diode IRLED to emit a wireless signal including the synchronous signal S _syn .

Please refer to FIG. 5, which is a schematic diagram showing the detailed circuit structure of an embodiment of the light receiving module RX. As shown in FIG. 5, the light receiving module RX includes a light receiving unit PHS, a band pass filter BPF, a front end circuit 50, an infrared sensor IRS, a medium access control circuit 52, and a processor CPU. The front end circuit 50 includes a programmable gain amplifier PGA, a low pass filter LPF and a zero current detector ZCD. The medium access control circuit 52 includes an AC-DC converter ADC, a physical layer PHY, a media access controller MAC, Clock unit CLK and DC-AC converter DAC.

In this embodiment, the wireless signal including the synchronization signal S _syn emitted by the infrared light emitting diode IRLED in FIG. 4 is received by the infrared sensor IRS in FIG. 5; the white light illumination in FIG. 4 The optical signal S _W emitted by the diode 42 is received by the light receiving unit PHS in Fig. 5. The light receiving unit PHS is coupled to the band pass filter BPF; the band pass filter BPF is coupled to the programmable gain amplifier PGA; the programmable gain amplifier PGA is coupled to the low pass filter LPF; and the low pass filter LPF is coupled to the AC-DC conversion The ADC is coupled to the physical layer PHY; the physical layer PHY is coupled to the media access controller MAC clock unit CLK; the media access controller MAC is coupled to the clock unit CLK and the processor MCU; The AC converter DAC is coupled to the physical layer PHY; the zero current detector ZCD is coupled to the infrared sensor IRS. When the zero current detector ZCD detects that the infrared sensor IRS receives the wireless signal including the synchronous signal S _syn sent by the infrared light emitting diode IRLED in FIG. 4, the zero current detector ZCD outputs the control signal. The clock unit CLK to the physical layer PHY to control the light receiving module RX can be synchronized with the light emitting module TX.

Compared with the prior art, the audio-visual transmission device and the optical transmitting module and the optical receiving module thereof according to the present invention can effectively integrate the power line communication technology and the visible light communication technology for video and audio transmission, and have the following advantages and effects:

(1) It can be applied to the transmission of indoor audio and video, especially for personal audio-visual navigation of exhibition venues or museums, indoor video broadcasting, simultaneous translation of multi-language lecture halls, and high-confidential conference rooms.

(2) It is only necessary to use the general power line communication chipset with visible light communication technology to realize the transmission of indoor audio and video, and the cost is relatively low.

(3) Since the power line communication chipset requires a current zero-crossing signal, the video transmission device of the present invention simulates the current zero phase sequence trigger signal through another independent frequency band signal (for example, low-cost infrared light), so that The communication between the light receiving module and the light emitting module can be synchronized.

(4) The light receiving module of the present invention can be set in a mobile communication device (such as a smart phone or a wireless earphone) according to actual needs, which not only increases the flexibility of use but also facilitates the use of the user.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

AVS‧‧‧ audio source

PLC‧‧‧Power Line Communication Module

PL‧‧‧Power Line

TX1~TX3‧‧‧Light emitting module

RX1~RX3‧‧‧Light receiving module

Claims (17)

An audio-visual transmission device includes: a power line communication module for providing a data to a power line to be combined with a power line signal into a composite power line signal, wherein the data comprises a sound data or an image data; The module is coupled to the power line, and includes: a transmitting power line communication unit for extracting the data from the composite power line signal; and an illumination driving unit coupled to the transmitting end power line communication unit for providing a driving according to the data a light emitting device coupled to the light emitting driving unit for emitting an optical signal according to the driving signal; a detecting unit; and an independent frequency band signal transmitting unit coupled to the detecting unit; and an optical receiving module The method includes: a light receiving unit for receiving the light signal emitted by the light emitting body; a receiving end power line communication unit coupled to the light receiving unit for reducing the optical signal to the data; and a video reproduction unit And coupling the power line communication unit at the receiving end to convert the data into the sound data or the image data; and a vertical band signal detecting unit, wherein when the detecting unit detects that the composite power line signal meets a specific condition, the detecting unit controls the independent frequency band signal transmitting unit to send a wireless signal including a synchronous signal, the light The independent frequency band signal detecting unit of the receiving module receives the synchronous signal in the wireless signal, so that the optical receiving module can communicate with the optical transmitting module. The video transmission device of claim 1, wherein the optical receiving module is a portable electronic device. The video transmission device of claim 1, wherein the light emitting module is disposed in a lamp holder or a light bulb. The audio-visual transmission device of claim 1, wherein the wireless signal emitted by the independent-band signal transmitting unit is an infrared ray, a deflected light or a wireless radio frequency. The video transmission device of claim 1, wherein the specific condition is that the composite power line signal conforms to a current zero-phase trigger. The audio-visual transmission device of claim 1, wherein the power line communication module receives the data from a video source through a network. The video transmission device of claim 1, wherein the illuminant is a visible light illuminating diode. A light emitting module is applied to the transmission of image or sound data. The light emitting module includes: a power line communication unit coupled to a power line for obtaining a data from a composite power line signal transmitted by the power line, wherein the light emitting module The information includes an image data or a sound data; an illumination driving unit coupled to the power line communication unit for providing a driving signal according to the data; an illuminating body coupled to the illuminating driving unit for transmitting according to the driving signal An optical signal; a detecting unit for detecting whether the composite power line signal meets a specific condition; and an independent frequency band signal transmitting unit coupled to the detecting unit, wherein the detecting unit detects the composite power line signal When the specific condition is met, the independent band signal transmitting unit sends a wireless signal including a synchronization signal to an optical receiving module to synchronize the communication between the optical receiving module and the optical transmitting module. The light emitting module of claim 8, wherein the detecting unit is coupled to the power line or disposed in the power line communication unit. The light emitting module of claim 8, wherein the power line communication unit further comprises: a front end circuit for performing gain filtering on the composite power line signal; and a media access control circuit coupled to the front end a circuit for extracting the data from the composite power line signal after gain filtering. The light emitting module of claim 9, wherein the light emitting driving unit comprises: a DC power generating circuit coupled to the power line for providing a DC current signal; and a voltage to current amplifying circuit coupled The medium access control circuit is configured to convert the data extracted by the media access control circuit into an alternating current signal and output; and a current adding circuit coupled to the direct current power generating circuit and the illuminant And coupling the DC current signal and the AC current signal to the driving signal. The optical transmitting module of claim 8, wherein the wireless signal emitted by the independent band signal transmitting unit is an infrared ray, a deflected light or a wireless radio frequency. The light emitting module of claim 8, wherein the specific condition is that the composite power line signal conforms to a current zero-phase trigger. An optical receiving module is applied to the transmission of image or sound. The light receiving module comprises: a light receiving unit for receiving an optical signal emitted by an illuminant; and a power line communication unit coupled to the light receiving a unit for extracting a data from the optical signal; an audio-video reproduction unit coupled to the power line communication unit for restoring the data to an image data or a sound data; and an independent frequency band signal detecting unit for Receiving a synchronization signal of one of the wireless signals emitted by the optical transmitting module to synchronize the communication between the optical receiving module and the optical transmitting module; wherein the wireless signal including the synchronous signal is consistent with one The light emission by a specific condition The module is issued. The light receiving module of claim 14, wherein the power line communication unit further comprises: a front end circuit coupled to the light receiving unit for gain filtering the optical signal; and a media access control The circuit is coupled to the front end circuit for obtaining the data from the optical signal after gain filtering. The light receiving module according to claim 14 is a portable electronic device. The optical receiving module of claim 14, wherein the specific condition is that a composite power line signal conforms to a current zero-phase trigger.