TWI586178B - Data broadcasting system using visible light, signal transmitting apparatus and apparatus for receiving visible light - Google Patents

Description

Visible light data broadcasting system, signal transmitting device, and visible light receiving device

The present invention relates to a communication system, and more particularly to a visible light data broadcasting system, a signal transmitting device, and a visible light receiving device.

Generally speaking, the traditional computer classroom teaching broadcasting system can be roughly divided into two types: hardware broadcasting and software broadcasting. In the hardware broadcast, there is a main control box on the teacher side, and the video control signal of the teacher end is transmitted to the hardware transfer box located at the student end through a wired manner, and the signal received by the hardware transfer box is displayed on the student's screen. And the speaker is presented. Because the broadcasting system needs independent physical lines, it is easy to be destroyed by students and lose the broadcasting function. Therefore, the line configuration of the broadcasting type is mostly in the form of serial connection. Therefore, when a node in the serial connection line is artificially damaged, the subsequent computer I cannot receive the broadcast.

On the other hand, in the software broadcast, a broadcast transmission software is installed on the computer of the teacher side, and a broadcast receiving software is installed on the computer of the student end, and the broadcast transmission software broadcasts the teaching content to the broadcast receiving software through the regional network, without requiring additional Hardware Equipment and low cost, but teachers and students' computers need higher computing power and higher network bandwidth as their main disadvantage. In recent years, there have been broadcast systems using radio waves to transmit data. The main difference between the software broadcasts described here is that the transmission methods are different, so it can be regarded as a variant of software broadcasting, and has the same advantages and disadvantages.

The present invention provides a visible light data broadcasting system, a signal transmitting device, and a visible light receiving device, which can be set in a simple manner in a teaching broadcast system usable in a classroom.

The visible light data broadcasting system of the present invention comprises: a main control terminal, a signal transmission device, a visible light transmitter and a plurality of visible light receiving devices. The main control terminal generates a video material. The signal transmitting device is coupled to the main control end to convert the video and audio data into a data signal. The visible light emitter is coupled to the signal transmitting device and emits visible light corresponding to the audiovisual material according to the data signal. The visible light receiving device includes a first visible light receiving device and a second visible light receiving device. Wherein, a first visible light receiving device receives the visible light emitted by the visible light emitter, converts the visible light to obtain the audio and video material, and plays the audio and video material, and the first visible light receiving device transmits the visible light received from the visible light emitter. In a first mode of the visible light data broadcasting system, the second visible light receiving device receives visible light from the first visible light receiving device, converts visible light to obtain audio and video data, and plays the audio and video material.

The signal transmission device of the present invention comprises: a video and audio data receiving unit, A coding unit, a signal amplification unit, an input unit, and a control signal receiving unit. The video data receiving unit receives a video material. The coding unit is coupled to the video and audio data receiving unit, and encodes and converts the video and audio data into a data signal. The signal amplifying unit is coupled to the coding unit, and the data signal is transmitted after the data signal is amplified. The control signal receiving unit is coupled to the encoding unit and the input unit. The control signal receiving unit receives a control signal from the input unit and transmits the control signal to the encoding unit. And, the encoding unit encodes the control signal and adds the control signal to the data signal.

The visible light receiving device of the present invention comprises: a first visible light receiving unit, a signal selecting unit, a decoding unit and a video output unit. The first visible light receiving unit receives a visible light. The signal selection unit is coupled to the first visible light receiving unit to receive visible light and amplify the visible light. The decoding unit is coupled to the signal selection unit to convert and decode the amplified visible light to obtain the audio and video data. Audio and video output unit, output audio and video data.

Based on the above, the present invention provides a visible light data broadcasting system, a signal transmitting device, and a visible light receiving device, which can utilize visible light as a transmission medium, so that a user can set a complete teaching broadcasting system in a very simple manner, thereby eliminating erection and maintenance. Trouble.

The above described features and advantages of the invention will be apparent from the following description.

10‧‧‧ Visible Light Information Broadcasting System

11‧‧‧ Space

110‧‧‧Master

120, 20‧‧‧Signal transmission device

210‧‧‧Video and audio data receiving unit

220‧‧‧ coding unit

230‧‧‧Signal amplification unit

240‧‧‧Control signal receiving unit

250‧‧‧ input unit

130‧‧‧ Visible light emitter

131‧‧‧LED driver

1311~131n‧‧‧n class LED driver

132~135‧‧‧LED group

141~149, 30‧‧‧ visible light receiving device

310, 350‧‧‧ visible light receiving unit

320‧‧‧Signal selection unit

330‧‧‧Decoding unit

340‧‧‧Video output unit

360‧‧‧ Visible light transmission unit

370‧‧‧Control signal output unit

Wall of W1~W2‧‧‧ space

VL, VL_1, VL_2‧‧‧ visible light

DS‧‧‧ control signal

MM‧‧‧ audio and video materials

FIG. 1 is a schematic diagram of a visible light data broadcasting system according to an embodiment of the invention.

2 is a block diagram of a device for signaling a signal transmission according to an embodiment of the invention.

FIG. 3 is a block diagram of a device for displaying a visible light receiving device according to an embodiment of the invention.

FIG. 4 is a schematic diagram of a visible light receiving unit and a visible light transmitting unit in a visible light receiving device according to an embodiment of the invention.

FIG. 5 is a schematic diagram of a visible light data broadcasting system according to an embodiment of the invention.

6A and 6B are schematic diagrams showing a visible light emitter according to an embodiment of the invention.

FIG. 1 is a schematic diagram of a visible light data broadcasting system according to an embodiment of the invention. Referring to FIG. 1, a visible light data broadcasting system 10 includes a master terminal 110, a signal transmitting device 120, a visible light emitter 130, and a plurality of visible light receiving devices (for example, the visible light receiving devices 141 to 143 shown in FIG. 1). The master terminal 110 generates video and audio data MM. The signal transmitting device 120 is coupled to the main control terminal 110, and converts the video material MM to the data signal DS. The visible light emitter 130 is coupled to the signal transmitting device 120 and emits visible light VL corresponding to the audiovisual material CS in a visible light manner according to the data signal DS.

In the embodiment shown in FIG. 1, the visible light receiving device includes visible light receiving devices 141-143. The visible light receiving device 141 receives the visible light VL emitted by the visible light emitter 130, converts the visible light VL to obtain the audio and video material MM, and plays the video and audio material MM. And, the visible light receiving device 141 transmits the visible light VL received from the visible light emitter 130. In the first mode of the visible light data broadcasting system 10, the visible light receiving device 142 receives the visible light VL from the visible light receiving device 141, converts the visible light VL to obtain the video material MM, and plays the video material MM. Similarly, in the first mode of the visible light data broadcasting system 10, the visible light receiving device 143 receives the visible light VL from the visible light receiving device 142, converts the visible light VL to obtain the video material MM, and plays the video material MM.

In this embodiment, the visible light data broadcasting system 10 is installed in a space 11, and the space 11 can be a computer classroom or any indoor space. In this embodiment, the main control terminal 110 can correspond to an electronic device operated by a teacher, such as a desktop computer fixed in the space 11, or a notebook computer, carried by the teacher to the space 11, and with the signal The transfer device 120 is connected. The signal transmitting device 120 may correspond to a broadcast controller in a general computer classroom teaching broadcast system or may be provided in the above broadcast controller. The video data MM may be a synchronization screen of the user interface of the operating system operated by the host 110 or an audio and video file played by the host 110. The present invention is not limited to the above.

In this embodiment, the visible light emitter 130 can be fixed on the ceiling of the space, wherein the visible light emitter 130 includes a light emitting diode driver and a plurality of light emitting diodes, which can be used to emit visible light VL, and the visible light can be Taking photos In addition to the use of the Ming, the data signal DS corresponding to the audiovisual material MM can be entrained without affecting the user. In the present invention, the visible light data broadcasting system 10 includes at least two visible light data broadcasting modes, a first mode and a second mode. In the first mode described above, a portion of the visible light receiving device (eg, the visible light receiving device 141) directly receives the visible light VL from the visible light emitter 130, and another portion of the visible light receiving device (eg, the visible light receiving device 142~143) The visible light VL is obtained from other visible light receiving devices in a manner similar to a series/relay. Therefore, the visible light receiving device (for example, the visible light receiving device 141) that directly receives the visible light VL from the visible light emitter 130 needs to be disposed corresponding to the visible light emitter 130.

For example, as shown in FIG. 1, the visible light receiving device 141 is disposed directly under the visible light emitter 130. On the other hand, the visible light receiving device (for example, the visible light receiving devices 142 to 143) that obtains the visible light VL from another visible light receiving device needs to be provided corresponding to the visible light receiving device that obtains the visible light VL. For example, the visible light receiving unit (not shown) for receiving the visible light VL by the visible light receiving device 142 is disposed to face the visible light receiving device 141 for transmitting the visible light transmitting unit (not shown) of the visible light VL. . And, the visible light receiving unit 143 for receiving the visible light VL by the visible light receiving device 143 is disposed to face the visible light receiving device 142 to emit the visible light transmitting unit of the visible light VL. And the visible light receiving unit for the visible light VL received in the visible light receiving device and the visible light transmitting unit for transmitting the visible light VL, such as the visible light transmitting device, 141 to 143, will be in the subsequent Description will be made in the examples.

2 is a block diagram of a device for signaling a signal transmission according to an embodiment of the invention. Referring to FIG. 2, the signal transmission device 20 includes a video material receiving unit 210, an encoding unit 220, and a signal amplifying unit 230. The video data receiving unit 210 is connected to the main control terminal 110, and receives the video material MM from the main control terminal. The video data receiving unit 210 can be, for example, an audio jack, a D-sub, a digital visual interface (DVI), a high definition multimedia interface (HDMI). ) or a display port (DP) or the like is connected to the host terminal 110.

The encoding unit 220 is coupled to the video and audio data receiving unit 210, and receives the video and audio data MM from the video and audio data receiving unit 210, and encodes and converts the video and audio data MM into the data signal DS. The encoding unit 220 encodes the video material MM and uses a modulation mode data signal DS, so that the visible light emitter 130 can correspondingly emit visible light VL according to the data signal DS, and the modulation mode can be a binary system opening and closing key. On-Off keying (OOK) or Phase Shift Keying (PSK), etc., the present invention is not limited to the above. The signal amplifying unit 230 is coupled to the encoding unit 220. After the data signal DS is amplified, the data signal DS is transmitted to the visible light emitter 130.

In the present embodiment, the signal transmission device 20 is integrated with a general broadcast controller, and further includes a control signal receiving unit 240 and an input unit 250. The input unit 250 can be connected or integrated with the control panel of the above broadcast controller (for example, can include a physical button, a light-emitting diode for indication, or a touch screen, etc.), and can be used by the user. The operation signal CS is generated by the operation of the teacher (ie, the teacher). The operation signal CS may correspond to the start/end of the broadcast of the image data MM, and the switching of the controlled end screen (for example, the display of the visible light receiving device 141 for playing the image data) is a black screen, and the controlled end (for example, with visible light) The personal computer connected to the receiving device 141 or the electronic device integrated with the visible light receiving device or the like is turned off or restarted, but the present invention is not limited thereto.

Further, the control signal receiving unit 240 may receive the control signal CS corresponding to the user operation and transmit the control signal CS to the encoding unit 220. The encoding unit 220 can encode and modulate the control signal CS in the same encoding mode and the same modulation mode as the data signal DS, and then add the signal signal DS to the data signal DS to transmit the signal amplifying unit 230. In this way, when the visible light receiving device (for example, the visible light receiving devices 141 to 143) receives the visible light VL and converts the visible light VL to obtain the audio and video material MM, the control signal CS can be obtained through the above-described conversion.

FIG. 3 is a block diagram of a device for displaying a visible light receiving device according to an embodiment of the invention. Referring to FIG. 3, the visible light receiving device 30 includes a visible light receiving unit 310, a signal selecting unit 320, a decoding unit 330, and a video output unit 340. The visible light receiving unit 310 receives the visible light VL. The signal selection unit 320 is coupled to the first visible light receiving unit 310, receives the visible light VL, and amplifies the visible light VL. The decoding unit 330 is coupled to the signal selection unit 330, converts (for example, demodulates in a manner corresponding to the above modulation mode), and decodes the amplified visible light VL to obtain the audiovisual material MM. The video output unit 340 can obtain the video material MM from the decoding unit 330 and output the video. Sound information MM.

As mentioned above, the visible light receiving device 30 corresponds to the visible light receiving devices 141 to 143 shown in FIG. 1, and may receive visible light VL from the visible light emitter 130 or other visible light receiving device. Therefore, in the present embodiment, visible light receiving The device 30 further includes another visible light receiving unit 350 and a visible light transmitting unit 360 such that the visible light receiving device 30 can receive visible light VL by the visible light emitter 130 or other visible light receiving device, and further transmit the visible light VL to another Visible light receiving device.

FIG. 4 is a schematic diagram of a visible light receiving unit and a visible light transmitting unit in the visible light receiving device 30 according to an embodiment of the invention. Referring to FIG. 4, in the embodiment, the visible light receiving units 310, 350 are respectively disposed at one side (for example, the left side) and the top portion 350 of the visible light receiving device 30, so as to receive visible light or receive light from another visible light receiving device. The visible light emitter directly receives visible light. The visible light transmitting unit 360 is disposed on the other side (for example, the right side) with respect to the side on which the visible light receiving unit 310 is disposed, in order to transfer the received visible light to another visible light receiving device.

For example, referring to FIG. 4 and FIG. 1 , with the visible light receiving device 30 as the visible light receiving device 142 in FIG. 1 , the visible light receiving device 30 (ie, the visible light receiving device 142 ) can pass through the visible light receiving unit 310 from the visible light receiving device. The visible light VL is received by the 141, and the visible light VL is forwarded to the visible light receiving device 143 by the visible light transmitting unit 360. The visible light receiving device 30 can also directly receive the visible light VL from the visible light emitter 130 through the visible light receiving unit 350. visible The light receiving device 30 can also be selectively disabled (eg, selectively disabled by the signal selecting unit 320) according to its position in the space 11 and the relative relationship with the visible light emitter 130 or other visible light receiving device. The unit 310, 350 or the visible light transmitting unit 360 is not limited in the present invention.

Referring to FIG. 3, in a case where the visible light receiving units 310 and 350 are not disabled, the signal selecting unit 320 may receive the visible light VL_1, VL_2 from the visible light receiving unit 310 and the visible light receiving unit 350, respectively, according to the visible light VL_1 and the visible light VL_2. The signal to noise ratio (SNR) is used to select one of the visible light VL_1 and the visible light VL_2 as the visible light VL, and further amplify the visible light VL, and transmit it to the decoding unit 330 and the visible light transmitting unit 360. When the visible light transmitting unit 360 receives the visible light VL from the signal selecting unit 320, the visible light VL can be transmitted, so that the next visible light receiving device can receive the visible light VL (for example, the visible light adjacent to the visible light receiving device 142 as shown in FIG. Receiving device 143).

On the other hand, in the present embodiment, the visible light receiving device 30 further includes a control signal output unit 370. When the decoding unit 330 further decodes and parses the visible light VL to obtain the control signal CS, the decoding unit 330 transmits the control signal CS. The control signal output unit 370 is supplied to output the control signal CS. The control signal output unit 370 can be an RS232, a Universal Asynchronous Receiver/Transmitter (UART), a Serial Peripheral Interface (SPI) interface, and a management data input/output (management data input/output). MDIO) interface, internal integrated circuit (Inter-Integrated Circuit, The I2C) bus interface, Universal Serial Bus (USB) interface, or general purpose input/output (GPIO) outputs the control signal CS, and the present invention is not limited to the above.

In an embodiment of the invention, the video output unit 340 and the control signal output unit 370 are all connected to an electronic device, such as a personal computer, a notebook computer, or the like. When the electronic device receives the video material MM from the video input unit 340, the video data MM can be played by using the display unit of the electronic device. When the electronic device receives the control signal CS from the control signal output unit 370, the corresponding program is executed according to the control signal CS, for example, starting/ending the display of the image data MM, switching the display unit to a black screen, and turning off the electronic device or restart.

In an embodiment of the invention, the visible light receiving device 30 is integrated with a personal computer, and the processing unit in the personal computer is connected to the video output unit 340 and the control signal output unit 370 through a designated connection interface. The processing unit of the personal computer receives the video material MM from the video input unit 340, and plays the video material MM through the display unit. When the processing unit receives the control signal CS from the control signal output unit 370, the corresponding program is executed in accordance with the control signal CS. In addition, in an embodiment of the invention, the visible light receiving device 30 can also be disposed in part with the electronic device. For example, it is provided in conjunction with a display screen of a personal computer, and is connected to a host of a personal computer through a connection interface, but the present invention is not limited to the above.

Hereinafter, two modes of operation included in the visible light data broadcasting system proposed by the present invention will be described. FIG. 5 is a diagram of an embodiment of the invention Schematic diagram of a visible light data broadcasting system. The embodiment shown in Figure 5 provides a more detailed embodiment than the embodiment shown in Figure 1. For the sake of brevity, the main control terminal and the signal transmission device are omitted in FIG. 5 and are not shown. In the embodiment shown in FIG. 5, the visible light emitter 130 includes a Light Emitting Diode (LED) driver 131 and LED groups 132-134. Similar to the embodiment shown in FIG. 1, the LED groups 132-134 of the visible light emitter 130 are disposed on the ceiling of the space, and the visible light receiving devices 141-149 are disposed corresponding to the LED groups 122-124 of the visible light emitter 130. In order to facilitate the expression of the correspondence between the LED groups 132-134 and the visible light receiving devices 141-149, FIG. 5 is depicted in a top view of the space 11.

In the present embodiment, the visible light data broadcasting system 10 includes two modes, a first mode and a second mode. The two modes can switch the LED driver 131 in the visible light emitter 130 through the signal transmitting device 120 or the host terminal 110. First, in the first mode, the LED driver 121 drives only one of the LED groups based on the data signal DS, for example, the LED group 132 emits visible light VL. When the visible light receiving devices 141, 144, 147 receive the visible light VL from the LED group 132, the visible light receiving devices 141, 144, 147 can be further transmitted through the visible light transmitting units (not shown) of the visible light receiving devices 141, 144, 147. Adjacent to the visible light receiving devices 142, 145, 148. Similarly, after the visible light receiving devices 142, 145, 148 can receive the visible light VL, the visible light VL is transferred to the adjacent visible light receiving devices 143, 146, 149. In this way, the visible light receiving devices 141 to 149 can further decode the visible light VL to obtain the audio and video material MM and play it.

The first mode of the visible light data broadcast system 10 can be applied to a situation in which the teacher controlling the master terminal requires that the light of the entire space 20 is not fully illuminated. For example, for the purpose of teaching, a projector is further provided in the space 11, and a screen is projected against the wall W1 of the space 11. In such a situation, there is no light source interference near the wall W1, and the visible light receiving devices 141 to 149 can still continuously play the video material MM received through the visible light VL.

On the other hand, since the construction of the visible light data broadcasting system 10 is performed, it is necessary to replace the conventional general bulb lamp with an LED group (for example, LED groups 132 to 134) that can be controlled by the LED driver 131. In the process of construction, as long as one of the LED groups 132-134 is completed, all the visible light receiving devices 141-149 in the space 20 can still obtain the audio and video data MM in the visible light VL. Even if the LED group 132~134 is not fully installed due to the funding or the engineering schedule, the visible light data broadcasting system 10 can still operate normally in the first mode.

In addition, in the second mode of the visible light data broadcasting system 10, the LED groups 132-134 are normally built and enabled, and when the LED driver 131 receives the data signal DS from the signal transmitting device, the LED driver 131 can be based on the data. The signal DS drives the LED groups 132-134 to emit visible light VL entraining the video material MM. In this way, the visible light receiving devices 141-149 in the space 20 can receive the visible light VL directly from the LED groups 132-134 of the visible light emitter (for example, through the visible light receiving unit 350 disposed at the top of the visible light receiving device 30 as shown in FIG. 4). ). In the second mode of the visible light data broadcasting system 10, the visible light VL can combine the effects of illumination and data transmission.

6A and 6B are schematic diagrams showing a visible light emitter according to an embodiment of the invention. Referring to FIG. 6A, the visible light emitter 130 may include an LED driver 131 and an LED group 135 (which may be equivalent to the LED groups 121-124 shown in FIG. 5). The LED driver receives a power source VCC and is based on the received data signal (eg, The data signal DS) shown in FIG. 5 drives the LED group 135 such that the visible light VL emitted by the LED group 135 includes the content of the data signal DS corresponding to the audiovisual material MM. The LED driver 131 can be implemented by a physical circuit, for example, including a bipolar junction transistor (BJT), an operational amplifier (OPA), a metal oxide half field effect transistor (MOSFET), or other circuit components. The physical circuit is implemented as a specially designed driver chip. It must be noted, however, that the switching frequency of the LED driver 131 must meet the requirements of the visible light data transmission rate (for example, the frequency must be such that the amount of data is sufficient to carry the data signal DS).

In addition, when the LED group 135 has a large power or special needs, the LED driver can be in a multi-stage manner as shown in FIG. 6B (the first-level LED driver 1311 to the n-th LED driver 131n, where n is a positive integer) The LED groups 135 are serially coupled and driven together. However, the invention is not limited thereto. It is worth mentioning that the visible light transmitting unit disposed in each visible light receiving device also has a similar structure to the visible light emitting device shown in FIG. 6A or FIG. 6B, and details are not described herein.

In an embodiment of the invention, the visible light data broadcasting system also has the capability of two-way transmission interaction. That is, the visible light receiving device can transmit data to the signal transmitting device and the host terminal 110 through the optical data broadcasting system in the same manner. In this embodiment, the visible light emitter 130 must add a visible light receiving unit, and each visible light connection The receiving device must add a visible light transmitting unit beside the original visible light receiving unit, and add a visible light receiving unit beside the visible light transmitting unit, so that the data transmitted from the visible light receiving device to the main control end can be transmitted along the control terminal. The path to each visible light receiving device is reversed and transmitted.

In the current teacher broadcast system on the market, the interaction of the teacher (corresponding to the master) on the broadcast controller mainly includes monitoring the screen data of the designated controlled end, and designating a controlled end to all the computers. Broadcast, specify a controlled endpoint to respond to the problem. The student (corresponding to the visible light receiving device) performs electronic hand-lifting through visible light, dialogue or message transmission between the teacher and the student. After the two-way transmission function is added to the hardware, the two-way transmission interaction function described above can also be implemented. In addition, the data returned by the visible light receiving device to the main control terminal can also be transmitted back to the main control terminal in a completely different manner. For example, considering the problem of line erection, the data transmitted back to the main control terminal by the visible light receiving device can also transmit data back and forth through the wireless network or Power Line Communication (PLC), and the present invention is not limited to the above.

In summary, the present invention provides a visible light data broadcasting system and a signal transmitting device therefor, and a visible light receiving device. Generally speaking, the existing two kinds of computer classroom teaching and broadcasting systems, such as hardware broadcasting and software broadcasting, have the disadvantages of being difficult to construct, vulnerable to damage, and consuming network bandwidth. The visible light data broadcasting system proposed in the present invention. It is to improve the above shortcomings and change the transmission mode to use visible light transmission to simplify the system architecture and installation difficulty, and reduce the probability of system damage. And, through the two types of visible light data broadcasting systems The working mode can be adjusted according to the needs of teaching and lighting. Even if the LED group as the visible light emitter has not been built, the visible light data broadcasting system can operate normally.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧ Visible Light Information Broadcasting System

11‧‧‧ Space

110‧‧‧Master

120‧‧‧Signal transmission device

130‧‧‧ Visible light emitter

141~143‧‧‧ Visible light receiving device

VL‧‧‧ visible light

DS‧‧‧ control signal

MM‧‧‧ audio and video materials

Claims (11)

A visible light data broadcasting system includes: a main control terminal for generating a video and audio material; a signal transmission device coupled to the main control terminal to convert the video and audio data into a data signal; and a visible light transmitter coupled to the signal transmission device, Transmitting, according to the data signal, visible light, including visible light corresponding to the audiovisual material; and a plurality of visible light receiving devices, including a first visible light receiving device and a second visible light receiving device, wherein the first visible light receiving device receives the light The visible light emitted by the visible light emitter, the visible light is converted to obtain the audiovisual material, and the audiovisual material is played, and the first visible light receiving device transmits the visible light received from the visible light emitter; and in the visible light data broadcasting system In a first mode, the second visible light receiving device receives the visible light from the first visible light receiving device, converts the visible light to obtain the audiovisual material, and plays the video and audio material. The visible light data broadcasting system of claim 1, wherein the visible light data broadcasting system is disposed in a space, wherein the visible light emitter is fixed on a ceiling of the space; the first visible light receiving The device is disposed in a manner that a visible light receiving unit of the first visible light receiving device corresponds to the visible light emitter; and the second visible light receiving device is a visible light of the second visible light receiving device The receiving unit is disposed in a manner corresponding to a visible light transmitting unit of the first visible light receiving device. The visible light data broadcasting system of claim 2, wherein the visible light receiving device comprises a third visible light receiving device, wherein the third visible light receiving device corresponds to a visible light receiving unit of the third visible light receiving device Provided in a manner of a visible light transmitting unit of the second visible light receiving device; and in the first mode of the visible light data broadcasting system, the third visible light receiving device receives the visible light from the second visible light receiving device, and converts The visible light obtains the audiovisual material and plays the video material. The visible light data broadcasting system of claim 3, wherein: the visible light emitter is further disposed corresponding to the second visible light receiving device and the third visible light receiving device; and a second in the visible light data broadcasting system In the mode, the second visible light receiving device and the third visible light receiving device receive the visible light from the visible light emitter, and respectively convert the visible light to obtain the audiovisual material. The visible light data broadcasting system of claim 1, wherein the signal transmitting device receives a control signal, and the signal transmitting device adds the control signal to the data signal, wherein the control signal is used to control the visible light. The receiving device performs a corresponding action. The visible light data broadcasting system of claim 1, wherein: the video material is a video stream, corresponding to a user interface of an operating system or Corresponds to a multimedia file. The visible light data broadcasting system of claim 1, wherein the visible light emitter comprises at least one light emitting diode driver and a plurality of light emitting diodes coupled to the at least one light emitting diode driver, wherein the at least one light emitting diode A light emitting diode driver drives the light emitting diodes to emit the visible light according to the data signal. A signal transmission device includes: a video and audio data receiving unit that receives a video and audio data; an encoding unit coupled to the video and audio data receiving unit, encoding and converting the video and audio data into a data signal; and a signal amplifying unit coupled to the code a unit that transmits the data signal after amplifying the data signal; an input unit; and a control signal receiving unit coupled to the coding unit and the input unit, wherein the control signal receiving unit receives a control signal from the input unit, and transmits The control signal is sent to the coding unit; and the coding unit encodes the control signal and adds the control signal to the data signal, wherein the control signal is used to control a visible light receiving device to perform a corresponding action. A visible light receiving device includes: a first visible light receiving unit that receives a visible light, a signal selecting unit coupled to the first visible light receiving unit, receives the visible light and amplifies the visible light; and a decoding unit coupled to the signal selecting unit , convert and decode the amplified The visible light obtains a video and audio material; an audio and video output unit outputs the audio and video data; and a visible light transmitting unit coupled to the signal selecting unit, receives the amplified visible light from the signal selecting unit, and transmits the visible light; and the second visible light The receiving unit is coupled to the signal selecting unit to receive the visible light, wherein the signal selecting unit respectively determines a signal noise ratio value of the visible light from the first visible light receiving unit and the second visible light receiving unit, and selects according to The signal noise ratio value is selected and amplified from the first visible light receiving unit or from the visible light of the second visible light receiving unit, and then transmitted to the encoding unit. The visible light receiving device of claim 9, wherein the visible light receiving device further comprises: a control signal output unit coupled to the decoding unit, wherein the decoding unit further decodes the visible light to obtain a control Signaling and transmitting the control signal to the control signal output unit. The visible light receiving device of claim 9, wherein the visible light receiving device further comprises: a display unit; and a processing unit coupled to the display unit, the audio and video output unit, and the control signal output unit, Wherein, when the processing unit receives a video material from the video output unit, the video data is played through the display unit; When the processing unit receives the control signal from the control signal output unit, the processing unit executes a work program corresponding to the control signal.