Visible light communication system and method and multimedia equipment

Abstract

The invention discloses a visible light communication system and method and multimedia equipment, and relates to the technical field of visible light communication, the visible light communication system comprises a visible light emitting device and a multimedia playing device, and the visible light emitting device is in optical communication connection with the multimedia playing device; the visible light transmitting device is used for determining a dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and processing the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal; and the multimedia playing device is used for processing the visible light signal to obtain a target multimedia signal and outputting playing content according to the target multimedia signal. The reliability of visible light communication in multimedia equipment application can be improved.

Description

Technical Field

[0001] The present application relates to the field of visible light communication technology, and in particular to a visible light communication system, method and multimedia device. Background Art

[0002] VLC (Visible Light Communication) uses light sources such as light-emitting diodes to emit visible light signals with high-speed brightness changes to transmit information. It has the advantages of fast single-point speed, rich communication spectrum resources, no electromagnetic interference, and large system capacity. It is a key technology for future communications.

[0003] At present, visible light communication technology has begun to be applied to multimedia devices such as televisions and smart screens. However, due to signal attenuation in visible light processing and transmission-related links, communication stability is reduced, and bit errors are generated, resulting in distortion of transmitted multimedia signals, affecting the reliability of visible light communication transmission signals.

[0004] In summary, how to improve the reliability of visible light communication in multimedia device applications has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0005] The main purpose of this application is to provide a visible light communication system, method and multimedia device, aiming to improve the reliability of visible light communication in multimedia device applications.

[0006] To achieve the above-mentioned purpose, the present application proposes a visible light communication system, the system comprising: a visible light emitting device and a multimedia playback device, wherein the visible light emitting device and the multimedia playback device are optically connected to each other;

[0007] The visible light emitting device is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and process the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal;

[0008] The multimedia playback device is used to process the visible light signal to obtain a target multimedia signal, and output playback content according to the target multimedia signal.

[0009] In one embodiment, the visible light emitting device comprises: a coding modulation module, a hybrid compensation module, a DC bias module and a transmitting module;

[0010] The coding and modulation module is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and perform coding and modulation processing on the initial multimedia signal and the dynamic carrier signal to obtain a modulated multimedia signal;

[0011] The hybrid compensation module is used to perform hybrid compensation processing on the modulated multimedia signal to obtain a multimedia signal to be transmitted;

[0012] The DC bias module is used to perform DC bias processing on the multimedia signal to be transmitted to obtain a driving signal;

[0013] The transmitting module is used to convert the driving signal into the visible light signal and send the visible light signal to the multimedia playback device.

[0014] In one embodiment, the coding and modulation module includes: a coding unit, a modulation unit and a carrier generation unit;

[0015] The encoding unit is used to parse the data volume parameter of the initial multimedia signal, generate a dynamic excitation signal according to the data volume parameter, and encode the initial multimedia signal to obtain an encoded multimedia signal;

[0016] The carrier generation unit is used to determine the dynamic carrier signal according to the dynamic excitation signal, wherein the carrier frequency of the dynamic carrier signal is proportional to the data amount parameter;

[0017] The modulation unit is used to modulate the dynamic carrier signal through the encoded multimedia signal to obtain the modulated multimedia signal.

[0018] In one embodiment, the hybrid compensation module includes: a bandwidth compensation unit, a gain compensation unit and a frequency compensation unit;

[0019] The bandwidth compensation unit is used to perform bandwidth compensation on the modulated multimedia signal according to a preset compensation multiple to obtain a first compensated multimedia signal, wherein the compensation multiple is proportional to the data volume parameter;

[0020] The gain compensation unit is used to perform gain compensation on the first compensated multimedia signal according to a preset gain multiple to obtain a second compensated multimedia signal, wherein the gain multiple is proportional to the data amount parameter;

[0021] The frequency compensation unit is used to perform frequency amplitude compensation on the amplitude value of each frequency point in the second compensated multimedia signal according to a preset amplitude compensation coefficient to obtain the multimedia signal to be transmitted, wherein, for each frequency point, the amplitude compensation coefficient is inversely proportional to the amplitude value of the frequency point.

[0022] In one embodiment, the visible light emitting device further comprises a first deflection control module, the emitting module comprises a first deflection unit and a visible light emitter, and the first deflection unit is fixedly connected to the visible light emitter;

[0023] The first deflection control module is used to receive the spatial coordinate information sent by the multimedia playback device, and control the first deflection unit to deflect based on the spatial coordinate information;

[0024] The first deflection unit is used to drive the visible light transmitter to adjust the signal transmission angle so that the visible light transmitter and the visible light receiver in the multimedia playback device are at an optimal signal alignment angle.

[0025] In one embodiment, the multimedia playback device includes: a receiving module, an amplifying module, an equalizing module, a demodulating module and a decoding module;

[0026] The receiving module is used to receive the visible light signal and convert the visible light signal into an electrical signal;

[0027] The amplification module is used to amplify the electrical signal to obtain an amplified electrical signal;

[0028] The equalization module is used to perform equalization processing on the amplified electrical signal to obtain a balanced electrical signal;

[0029] The demodulation module is used to demodulate the equalized electrical signal to obtain a coded multimedia signal;

[0030] The decoding module is used to decode and post-process the encoded multimedia signal to obtain a target multimedia signal.

[0031] In one embodiment, the multimedia playback device further includes a spatial processing module, and the receiving module includes a collection unit;

[0032] The acquisition unit is used to acquire spatial information of the visible light emitter in the visible light emitting device;

[0033] The space processing module is used to analyze the space information to obtain the space coordinate information of the visible light emitter, and send the space coordinate information to the first deflection control module of the visible light emitting device.

[0034] In one embodiment, the multimedia playback device further includes a space processing module and a second deflection control module, the receiving module includes a collection unit, a second deflection unit and a visible light receiver, and the second deflection unit is fixedly connected to the visible light receiver;

[0035] The acquisition unit is used to acquire spatial information of the visible light emitter in the visible light emitting device;

[0036] The spatial processing module is used to analyze the spatial information to obtain the spatial coordinate information of the visible light emitter, and send the spatial coordinate information to the second deflection control module;

[0037] The second deflection control module is used to control the second deflection unit to deflect based on the spatial coordinate information;

[0038] The second deflection unit is used to drive the visible light receiver to adjust the signal receiving angle so that the visible light receiver and the visible light transmitter in the visible light transmitting device are at an optimal signal alignment angle.

[0039] In addition, to achieve the above-mentioned purpose, the present application also proposes a visible light communication method, which is applied to the above-mentioned visible light communication system, wherein the visible light communication system comprises: a visible light emitting device and a multimedia playback device, wherein the visible light emitting device and the multimedia playback device are optically connected to each other;

[0040] The visible light emitting device is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and process the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal;

[0041] The multimedia playback device is used to process the visible light signal to obtain a target multimedia signal, and output playback content according to the target multimedia signal.

[0042] In addition, to achieve the above-mentioned purpose, the present application also proposes a multimedia device, which includes the above-mentioned visible light communication system.

[0043] In addition, to achieve the above-mentioned purpose, the present application also proposes a visible light communication device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the visible light communication method as described above.

[0044] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium. A computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the visible light communication method as described above are implemented.

[0045] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the steps of the visible light communication method described above.

[0046] The present application proposes a visible light communication system, which includes a visible light emitting device and a multimedia playback device, wherein the visible light emitting device and the multimedia playback device are optically connected; the visible light emitting device determines a dynamic carrier signal matching the initial multimedia signal based on a data volume parameter of the received initial multimedia signal, and processes the initial multimedia signal and the corresponding dynamic carrier signal to generate a transmittable visible light signal; the multimedia playback device receives and processes the visible light signal transmitted by the visible light emitting device to obtain a target multimedia signal, and outputs corresponding playback content, such as video, audio, image or text, according to the target multimedia signal.

[0047] In this way, compared with the traditional visible light communication system that uses a fixed carrier signal for data transmission, the traditional method cannot achieve optimal resource allocation when faced with multimedia signals of different data volumes and different complexities. The present application matches the corresponding dynamic carrier signal according to the data volume parameters of the initial multimedia signal, so that the dynamic carrier signal can flexibly adapt to the initial multimedia signals of different data volumes, avoiding the waste of spectrum resources or signal distortion caused by fixed carrier signals, thereby improving the reliability of visible light communication in multimedia device applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0049] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 A schematic diagram of the system structure provided for Embodiment 1 of the visible light communication system of the present application;

[0051] Figure 2 Another system structure schematic diagram provided for Embodiment 1 of the visible light communication system of the present application;

[0052] Figure 3 A schematic diagram of the structure of a coding and modulation module provided in Example 1 of the visible light communication system of the present application;

[0053] Figure 4 A schematic diagram of the structure of a hybrid compensation module provided in Example 1 of the visible light communication system of the present application;

[0054] Figure 5 A flowchart of Embodiment 2 of the visible light communication method of the present application is provided;

[0055] Figure 6 Schematic diagram of the device structure of the hardware operating environment involved in the visible light communication method in the embodiment of the present application.

[0056] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0058] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0059] The main solution of the embodiment of the present application is: to provide a visible light communication system, the system including: a visible light emitting device and a multimedia playback device, the visible light emitting device and the multimedia playback device are optically connected; the visible light emitting device is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and process the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal; the multimedia playback device is used to process the visible light signal to obtain a target multimedia signal, and output the playback content according to the target multimedia signal.

[0060] At present, visible light communication technology has begun to be applied to multimedia devices such as televisions and smart screens. However, due to signal attenuation in visible light processing and transmission-related links, communication stability is reduced, and bit errors are generated, resulting in distortion of transmitted multimedia signals, affecting the reliability of visible light communication transmission signals.

[0061] In response to the above problems, the embodiments of the present application provide a solution. Compared with the traditional visible light communication system that uses a fixed carrier signal for data transmission, the traditional method cannot achieve optimal resource allocation when facing multimedia signals with different data volumes and different complexities. The embodiments of the present application match the corresponding dynamic carrier signal according to the data volume parameter of the initial multimedia signal, so that the dynamic carrier signal can flexibly adapt to the initial multimedia signals with different data volumes, avoid the waste of spectrum resources or signal distortion caused by fixed carrier signals, thereby improving the reliability of visible light communication in multimedia device applications.

[0062] Based on this, the embodiment of the present application provides a visible light communication system, referring to Figure 1 , Figure 1 This is a schematic diagram of the system structure of the first embodiment of the visible light communication system of the present application.

[0063] In this embodiment, the visible light communication system includes: a visible light emitting device 10 and a multimedia playback device 20, and the visible light emitting device 10 and the multimedia playback device 20 are connected to each other by optical communication;

[0064] It should be noted that the visible light communication system is a communication system that uses visible light spectrum resources for data transmission. It uses visible light emitted by light sources such as LED (Light Emitting Diode) as a transmission medium, and can achieve high-speed, large-capacity data transmission; the visible light emitting device 10 is a device in the visible light communication system that is responsible for converting the initial multimedia signal into a visible light signal and sending it out; the multimedia playback device 20 is a device in the visible light communication system that is responsible for receiving the visible light signal and converting it into a target multimedia signal, and then outputting the playback content.

[0065] The visible light emitting device 10 is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and process the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal;

[0066] It should be noted that the data volume parameter of the initial multimedia signal refers to the data volume information such as the resolution and frame rate of the initial multimedia signal. The dynamic carrier signal can be used as a carrier of the initial multimedia signal. The frequency, amplitude and other characteristics of the dynamic carrier signal vary according to the data volume parameters of the initial multimedia signal.

[0067] In this embodiment, the visible light emitting device 10 can receive an initial multimedia signal, which may include various types of multimedia data such as audio, video and / or images. The visible light emitting device 10 determines a dynamic carrier signal that matches the received initial multimedia signal based on the data volume parameter of the initial multimedia signal, and then performs a series of processing on the initial multimedia signal and the dynamic carrier signal, such as modulation, encoding, signal compensation and other steps, to generate a transmittable visible light signal.

[0068] The multimedia playback device 20 is used to process the visible light signal to obtain a target multimedia signal, and output playback content according to the target multimedia signal.

[0069] In this embodiment, after receiving the visible light signal sent by the visible light emitting device 10, the multimedia playback device 20 will perform corresponding processing on it, such as demodulation, decoding and other steps, to restore the multimedia information to be output, that is, the target multimedia signal, and then output the corresponding playback content according to the target multimedia signal, such as playing video, audio or displaying images.

[0070] It should also be noted that the visible light communication system also includes a space transmission link between the visible light emitting device 10 and the multimedia playback device 20, such as a visible light link, a deflection control link, etc. These space transmission links are usually established in free space. Free space usually refers to air, outer space or vacuum and other similar spaces. These spaces allow optical signals (such as visible light emitted by lasers or LEDs) to propagate freely therein, thereby realizing optical signal transmission between the visible light emitting device 10 and the multimedia playback device 20.

[0071] Exemplarily, in a feasible embodiment, the visible light communication system includes a visible light transmitting device 10, a multimedia playback device 20, and a space transmission link. After the visible light transmitting device 10 encodes, dynamically modulates and compensates the initial multimedia signal, and processes the DC bias, it converts the signal into a driving signal to drive the visible light transmitter 1041 to emit a visible light signal, which is transmitted to the multimedia playback device 20 through the downlink visible light link. After receiving the visible light signal, the visible light receiver 2011 of the receiving module 201 in the multimedia playback device 20 converts the signal into an electrical signal, performs signal amplification, signal equalization, and demodulation, and then extracts the encoded multimedia signal; the encoded multimedia signal is further decoded and post-processed to obtain a video signal to drive the display screen and / or an audio signal to drive the speaker, thereby realizing audio and video playback.

[0072] In one possible embodiment, see Figure 2 , the visible light emitting device 10 comprises: a coding modulation module 101, a hybrid compensation module 102, a DC bias module 103 and a transmitting module 104;

[0073] The coding and modulation module 101 is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and perform coding and modulation processing on the initial multimedia signal and the dynamic carrier signal to obtain a modulated multimedia signal;

[0074] In this embodiment, the coding and modulation module 101 is used to receive and process the initial multimedia signal, determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and convert the initial multimedia signal and the dynamic carrier signal into a modulated multimedia signal through coding and modulation technology, thereby improving the signal's anti-interference ability and transmission efficiency.

[0075] A hybrid compensation module 102, configured to perform hybrid compensation processing on the modulated multimedia signal to obtain a multimedia signal to be transmitted;

[0076] In this embodiment, the hybrid compensation module 102 further optimizes the modulated multimedia signal and can correct the error and distortion in the modulated multimedia signal, thereby generating a purer and more stable multimedia signal to be transmitted.

[0077] A DC bias module 103, used for performing DC bias processing on the multimedia signal to be transmitted to obtain a driving signal;

[0078] In this embodiment, the DC bias module 103 performs DC bias processing on the multimedia signal to be transmitted, and can add a DC component to the multimedia signal to be transmitted to obtain a driving signal, which contains all necessary information (such as level, frequency, and waveform, etc.) to drive light sources such as LEDs to emit visible light signals to ensure that the signal maintains a stable level during transmission, thereby avoiding signal distortion and attenuation.

[0079] The transmitting module 104 is used for converting the driving signal into a visible light signal and sending the visible light signal to the multimedia playback device 20 .

[0080] In this embodiment, the transmitting module 104 converts the driving signal into a visible light signal and transmits the visible light signal to the multimedia playback device 20. During the transmission process, the transmitting module 104 can control the intensity and direction of the visible light signal to ensure that the visible light signal can accurately and stably reach the multimedia playback device 20.

[0081] In one possible embodiment, see Figure 3 , the coding and modulation module 101 includes: a coding unit 1011, a modulation unit 1012 and a carrier generation unit 1013;

[0082] The encoding unit 1011 is used to analyze the data volume parameter of the initial multimedia signal, generate a dynamic excitation signal according to the data volume parameter, and encode the initial multimedia signal to obtain an encoded multimedia signal;

[0083] In this embodiment, the encoding unit 1011 is used to parse the data volume parameters of the initial multimedia signal, and based on the data volume parameters obtained by the analysis, the encoding unit 1011 generates a dynamic excitation signal, and the dynamic excitation signal is used to adjust the parameters of the encoding process to ensure that the encoded multimedia signal after encoding can adapt to different data volume requirements, thereby improving the data's anti-interference ability and transmission efficiency, while reducing redundant information to save bandwidth resources.

[0084] The carrier generation unit 1013 is used to determine a dynamic carrier signal according to the dynamic excitation signal, wherein the carrier frequency of the dynamic carrier signal is proportional to the data volume parameter;

[0085] In this embodiment, the carrier generation unit 1013 determines the characteristics of the dynamic carrier signal based on the dynamic excitation signal generated by the encoding unit 1011. The dynamic carrier signal determines the bandwidth and frequency characteristics of the signal transmission. The carrier frequency of the dynamic carrier signal is proportional to the data volume parameter to fully utilize the bandwidth resources while maintaining the signal quality.

[0086] The modulation unit 1012 is used to modulate the dynamic carrier signal by encoding the multimedia signal to obtain a modulated multimedia signal.

[0087] In this embodiment, the modulation unit 1012 modulates the encoded multimedia signal onto a dynamic carrier signal. After modulation processing, the obtained modulated multimedia signal not only contains the information of the original multimedia signal, but also has characteristics suitable for transmission in a visible light communication system.

[0088] Exemplarily, in a feasible embodiment, the process of coding and modulation module processing includes: first, coding processing: after the signal is detected, the initial multimedia signal is analyzed to obtain the data volume parameters such as the resolution and frame rate of the initial multimedia signal, and an excitation signal is generated; at the same time, the initial multimedia signal is encoded, and the encoded multimedia signal is output. In the process of analyzing the initial multimedia signal, when it is identified as a multimedia signal with a large amount of data, a high excitation signal is generated; when it is identified as a multimedia signal with a small amount of data, a low excitation signal is generated. If no signal is detected, it will not be processed. Then, the carrier generation unit 1013 generates a dynamic carrier signal under the excitation of the excitation signal, that is, a high excitation signal generates a high-frequency carrier signal; a low excitation signal generates a low-frequency carrier signal. The modulation unit 1012 receives the coded multimedia signal, modulates the dynamic carrier signal by the coded multimedia signal, modulates the coded multimedia onto the carrier, and forms a modulated multimedia signal.

[0089] The main advantages of this coding and modulation processing are: the excitation signal and the carrier signal will be generated only when there is an initial multimedia signal, otherwise there will be no carrier signal, which can avoid extra power consumption when there is no signal; the carrier signal is a dynamic carrier generated according to the data volume parameters of the initial multimedia signal. The carrier frequency is high when the data volume is large and low when the data volume is small, which can effectively meet the modulation requirements and effectively reduce power consumption.

[0090] In one possible embodiment, see Figure 4 , the hybrid compensation module 102 includes: a bandwidth compensation unit 1021, a gain compensation unit 1022 and a frequency compensation unit 1023;

[0091] The bandwidth compensation unit 1021 is used to perform bandwidth compensation on the modulated multimedia signal according to a preset compensation multiple to obtain a first compensated multimedia signal, wherein the compensation multiple is proportional to the data volume parameter;

[0092] In this embodiment, the bandwidth compensation unit 1021 adjusts the bandwidth of the input modulated multimedia signal according to a preset compensation multiple to generate a first compensated multimedia signal, wherein the compensation multiple is proportional to the data volume parameter of the initial multimedia signal. If the data volume parameter is large, the compensation multiple will also increase accordingly to ensure that the bandwidth requirement of the signal during transmission is met.

[0093] A gain compensation unit 1022, configured to perform gain compensation on the first compensated multimedia signal according to a preset gain multiple to obtain a second compensated multimedia signal, wherein the gain multiple is proportional to a data amount parameter;

[0094] In this embodiment, the gain compensation unit 1022 further performs gain adjustment on the first compensated multimedia signal to generate a second compensated multimedia signal, wherein the gain multiple is proportional to the data volume parameter of the initial multimedia signal. If the data volume parameter is large, the gain multiple will also increase accordingly to ensure that the signal strength is maintained at an appropriate level during transmission.

[0095] The frequency compensation unit 1023 is used to perform frequency compensation on the amplitude value of each frequency point in the second compensated multimedia signal according to a preset amplitude compensation coefficient to obtain a multimedia signal to be transmitted, wherein for each frequency point, the amplitude compensation coefficient is inversely proportional to the amplitude value of the frequency point.

[0096] In this embodiment, the frequency compensation unit 1023 performs frequency amplitude compensation on the amplitude value of each frequency point in the second compensated multimedia signal according to a preset amplitude compensation coefficient to generate a multimedia signal to be transmitted, wherein for each frequency point in the second compensated multimedia signal, its amplitude value will be adjusted according to the preset amplitude compensation coefficient, and the amplitude compensation coefficient is inversely proportional to the original amplitude value of the frequency point. If the amplitude value of a certain frequency point is higher, its compensation coefficient will be reduced accordingly to balance the amplitude of each frequency point and improve the transmission quality and stability of the signal.

[0097] In this way, the hybrid compensation module 102 performs comprehensive compensation and adjustment on the input modulated multimedia signal through the coordinated work of the bandwidth compensation unit 1021, the gain compensation unit 1022 and the frequency compensation unit 1023, so as to ensure that the signal can maintain a stable bandwidth, appropriate gain and balanced frequency amplitude during the transmission process, thereby improving the overall transmission quality and reliability of the signal.

[0098] For example, in a feasible embodiment, the hybrid compensation process includes: for the modulated multimedia signal after encoding and dynamic modulation, firstly, the compensation multiple is set to perform bandwidth compensation to increase the spectrum bandwidth of the modulated multimedia signal. For example, the spectrum bandwidth before compensation is Bd, the compensation multiple is set to k, the spectrum bandwidth after compensation is k*Bd, and the bandwidth is increased by k times. Then the gain multiple is set to perform gain compensation to increase the amplitude of the signal after bandwidth compensation. For example, the amplitude before compensation is Ap, the gain multiple is set to d, the spectrum bandwidth after compensation is d*Ap, and the bandwidth is increased by d times. Finally, frequency compensation is performed, and the amplitudes corresponding to the specific frequency points f1, f2, ..., fn of the signal are set to Ap1, Ap2, ..., Apn, and the amplitude compensation coefficients of the frequency points are x1, x2, ..., xn, and the amplitudes of the compensated specific frequency points are x1*Ap1, x2*Ap2, ..., xn*Ap respectively.

[0099] It should be noted that the order of bandwidth compensation, gain compensation and frequency band compensation can be adjusted based on actual application scenarios, and different compensation parameters can be set based on the data volume parameter of the initial multimedia signal.

[0100] The main advantages of this hybrid processing are: it can improve signal quality according to the actual signal strength, data volume and visible light link environment, avoid the decline of communication stability and distortion of transmitted multimedia signals, and improve transmission stability and reliability.

[0101] In one possible embodiment, see Figure 2 , the visible light emitting device 10 further includes a first deflection control module 105, the emitting module 104 includes a first deflection unit 1042 and a visible light emitter 1041, and the first deflection unit 1042 is fixedly connected to the visible light emitter 1041;

[0102] A first deflection control module 105, configured to receive the spatial coordinate information sent by the multimedia playback device 20, and control the first deflection unit 1042 to deflect based on the spatial coordinate information;

[0103] In this embodiment, the first deflection control module 105 receives spatial coordinate information sent from the multimedia playback device 20, where the spatial coordinate information is the specific position of the visible light emitter 1041 collected by the multimedia playback device 20. The first deflection control module 105 performs deflection control on the first deflection unit 1042 based on the received spatial coordinate information.

[0104] The first deflection unit 1042 is used to drive the visible light transmitter 1041 to adjust the signal transmission angle so that the visible light transmitter 1041 and the visible light receiver 2011 in the multimedia playback device 20 are at an optimal signal alignment angle.

[0105] In this embodiment, when the first deflection unit 1042 adjusts its deflection angle, it will drive the visible light emitter 1041 fixedly connected thereto to deflect together. The visible light emitter 1041 can adjust its own signal transmission angle of the visible light signal accordingly, so that an optimal alignment angle is formed between the signal transmission angle and the visible light receiver 2011 in the multimedia playback device 20, thereby improving the stability of the visible light signal transmission.

[0106] Exemplarily, the multimedia playback device 20 can obtain the spatial information of the visible light transmitter 1041 in the transmitting module 104, output the spatial coordinates after spatial processing, and send it to the visible light transmitting device 10 through the uplink control link; the visible light transmitting device 10 receives the spatial coordinate parameters, outputs the deflection control instructions according to the spatial coordinate parameters, and controls the deflection of the visible light transmitter 1041, so that the visible light transmitter 1041 and the visible light receiver 2011 are in the optimal alignment position.

[0107] In one possible embodiment, see Figure 2 The multimedia playback device 20 includes: a receiving module 201, an amplifying module 202, an equalizing module 203, a demodulating module 204 and a decoding module 205;

[0108] The receiving module 201 is used to receive the visible light signal and convert the visible light signal into an electrical signal;

[0109] The amplification module 202 is used to amplify the electrical signal to obtain an amplified electrical signal;

[0110] In this embodiment, the receiving module 201 is used to receive the visible light signal sent by the visible light emitting device 10 and convert the visible light signal into an electrical signal. Then, the amplifying module 202 amplifies the electrical signal to obtain an amplified electrical signal, thereby enhancing the strength of the signal and ensuring that the signal does not lose key information due to attenuation during subsequent processing.

[0111] The equalization module 203 is used to perform equalization processing on the amplified electrical signal to obtain an equalized electrical signal;

[0112] In this embodiment, the equalization module 203 performs equalization processing on the amplified electrical signal, such as adjusting the frequency response and amplitude of the amplified electrical signal, to eliminate distortion and fluctuation in the signal and obtain a balanced electrical signal to ensure stable signal quality.

[0113] The demodulation module 204 is used to demodulate the equalized electrical signal to obtain a coded multimedia signal;

[0114] The decoding module 205 is used to decode and post-process the encoded multimedia signal to obtain a target multimedia signal.

[0115] In this embodiment, the demodulation module 204 demodulates the equalized electrical signal to extract the encoded multimedia information carried in the signal to obtain an encoded multimedia signal. Then, the decoding module 205 decodes and post-processes the encoded multimedia signal. The post-processing step may include image enhancement, audio filtering and other processing methods to improve the clarity and / or audibility of the multimedia content to restore the original multimedia signal content, that is, to obtain the target multimedia signal, so as to ensure that the user can smoothly watch or listen to the multimedia content.

[0116] Thus, the multimedia playback device 20 achieves efficient and accurate completion of the entire process from receiving the visible light signal to playing the final multimedia content by integrating the receiving module 201, the amplifying module 202, the equalizing module 203, the demodulating module 204 and the decoding module 205.

[0117] In one possible embodiment, see Figure 2 , the multimedia playback device 20 further includes a space processing module 206, and the receiving module 201 includes a collection unit 2012;

[0118] The acquisition unit 2012 is used to acquire the spatial information of the visible light emitter 1041 in the visible light emitting device 10;

[0119] In this embodiment, the acquisition unit 2012 is used to acquire the spatial information of the visible light emitter 1041 in the visible light emitting device 10. The acquisition unit 2012 may be a radar, a camera, or the like.

[0120] The spatial processing module 206 is used to analyze the spatial information, obtain the spatial coordinate information of the visible light emitter 1041 , and send the spatial coordinate information to the first deflection control module 105 of the visible light emitting device 10 .

[0121] In this embodiment, the spatial processing module 206 analyzes and calculates the collected spatial information to obtain the spatial coordinate information of the visible light emitter 1041, and promptly transmits the spatial coordinate information to the first deflection control module 105 of the visible light emitting device 10, so that the first deflection control device can adjust the direction of the emitter according to the spatial coordinate information of the visible light emitter 1041, thereby ensuring that the visible light emitter 1041 can accurately emit visible light to the visible light receiver 2011 as expected.

[0122] In this way, the emission angle of the visible light transmitter 1041 can be adjusted so that the visible light transmitter 1041 and the visible light receiver 2011 are in the best alignment position, so that the stability of the visible light transmission link and the transmission signal are optimal.

[0123] In another feasible embodiment, the multimedia playback device 20 further includes a space processing module 206 and a second deflection control module, the receiving module 201 includes a collection unit 2012, a second deflection unit and a visible light receiver 2011, and the second deflection unit is fixedly connected to the visible light receiver 2011;

[0124] The acquisition unit 2012 is used to acquire the spatial information of the visible light emitter 1041 in the visible light emitting device 10;

[0125] In this embodiment, the acquisition unit 2012 is used to acquire the spatial information of the visible light emitter 1041 in the visible light emitting device 10. The acquisition unit 2012 may be a radar, a camera, or the like.

[0126] The spatial processing module 206 is used to analyze the spatial information, obtain the spatial coordinate information of the visible light emitter 1041, and send the spatial coordinate information to the second deflection control module;

[0127] In this embodiment, the space processing module 206 analyzes and calculates the collected space information to obtain the space coordinate information of the visible light emitter 1041, and transmits the space coordinate information to the second deflection control module in a timely manner.

[0128] A second deflection control module, used for controlling the second deflection unit to deflect based on the spatial coordinate information;

[0129] In this embodiment, the second deflection control module receives the spatial coordinate information of the space transmitter sent by the space processing module 206 , and the second deflection control module performs deflection control on the second deflection unit based on the received spatial coordinate information.

[0130] The second deflection unit is used to drive the visible light receiver 2011 to adjust the signal receiving angle so that the visible light receiver 2011 and the visible light transmitter 1041 in the visible light transmitting device 10 are at an optimal signal alignment angle.

[0131] In this embodiment, when the second deflection unit adjusts its deflection angle, it will drive the visible light receiver 2011 fixedly connected thereto to deflect together. The visible light receiver 2011 can adjust its own signal receiving angle for receiving the visible light signal accordingly, so that an optimal alignment angle is formed between the signal receiving angle and the visible light transmitter 1041 in the visible light transmitting device 10, thereby improving the stability of the visible light signal transmission.

[0132] In this way, the receiving angle of the visible light receiver 2011 can be adjusted so that the visible light transmitter 1041 and the visible light receiver 2011 are in the best alignment position, so that the stability of the visible light transmission link and the transmission signal are optimal. It should be noted that in actual application scenarios, you can choose to only adjust the receiving angle of the visible light receiver 2011 or only adjust the emission angle of the visible light transmitter 1041.

[0133] For example, in a feasible implementation manner, the system structure diagram of the visible light communication system is as follows: Figure 2 As shown, the visible light emitting device 10 performs coding modulation, hybrid compensation and DC bias processing on the initial multimedia, and then converts it into a driving signal to drive the visible light emitter 1041 of the transmitting module 104. The visible light emitter 1041 converts the driving electrical signal into an optical signal and transmits it through the downlink visible light link.

[0134] The visible light receiver 2011 of the receiving module 201 of the multimedia playback device 20 detects and receives the visible light signal, converts it into an electrical signal, and extracts the encoded multimedia signal after signal amplification, equalization and demodulation processing; the encoded multimedia signal is further decoded and post-processed to obtain a video signal to drive the display screen and an audio signal to drive the speaker, thereby realizing audio and video playback.

[0135] Furthermore, the acquisition unit 2012 of the receiving module 201 of the multimedia playback device 20 acquires the spatial information of the visible light transmitter 1041 of the transmitting module 104, and the acquisition unit 2012 may be a radar, a camera, etc. Then the spatial processing module 206 performs processing such as identification and spatial position calibration on the spatial information, outputs spatial coordinate parameters, and sends them to the first deflection control module 105 of the visible light transmitting device 10 through the uplink deflection control link. The first deflection control module 105 of the visible light transmitting device 10 outputs a deflection control instruction according to the spatial coordinate parameters, controls the first deflection unit 1042 to deflect, thereby driving the visible light transmitter 1041 to deflect, thereby adjusting the emission angle of the visible light transmitter 1041, so that the visible light transmitter 1041 and the visible light receiver 2011 are in the best alignment position. This makes the stability of the visible light transmission link and the transmission signal optimal.

[0136] In summary, compared with the traditional visible light communication system that uses a fixed carrier signal for data transmission, the traditional method cannot achieve optimal resource allocation when facing multimedia signals with different data volumes and different complexities. The embodiment of the present application matches the corresponding dynamic carrier signal according to the data volume parameter of the initial multimedia signal, so that the dynamic carrier signal can flexibly adapt to the initial multimedia signals with different data volumes, avoids the waste of spectrum resources or signal distortion caused by fixed carrier signals, and thus improves the reliability of visible light communication in multimedia device applications.

[0137] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and no further description will be given later. On this basis, the embodiment of the present application provides a visible light communication method, referring to Figure 5 , Figure 5 This is a flow chart of the visible light communication method of the present application.

[0138] In this embodiment, the visible light communication method is applied to the visible light communication system in the first embodiment. The system includes a visible light emitting device and a multimedia playback device. The visible light emitting device and the multimedia playback device are optically connected. The visible light communication method includes steps S10 to S20:

[0139] Step S10, determining a dynamic carrier signal according to a data volume parameter of an initial multimedia signal through a visible light emitting device, and processing the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal;

[0140] In this embodiment, the visible light emitting device can receive an initial multimedia signal, which may include various types of multimedia data such as audio, video and / or images. The visible light emitting device determines a dynamic carrier signal that matches the received initial multimedia signal based on the data volume parameter of the initial multimedia signal, and then performs a series of processing on the initial multimedia signal and the dynamic carrier signal, such as modulation, encoding, signal compensation and other steps, to generate a transmittable visible light signal.

[0141] In step S20, the visible light signal is processed by the multimedia playback device to obtain a target multimedia signal, and playback content is output according to the target multimedia signal.

[0142] In this embodiment, after receiving the visible light signal sent by the visible light emitting device, the multimedia playback device will perform corresponding processing on it, such as demodulation, decoding and other steps, to restore the multimedia information to be output, that is, the target multimedia signal, and then output the corresponding playback content according to the target multimedia signal, such as playing video, audio or displaying images.

[0143] The visible light communication method provided in the embodiment of the present application is applied to the visible light communication system in the above embodiment, and can improve the reliability of visible light communication in multimedia device applications. Compared with the prior art, the beneficial effects of the visible light communication method provided in the embodiment of the present application are the same as the beneficial effects of the visible light communication system provided in the above embodiment, and other technical features in the visible light communication method are the same as the features disclosed in the visible light communication system in the above embodiment, which will not be repeated here.

[0144] An embodiment of the present application also proposes a multimedia device, which includes the visible light communication system of the above-mentioned embodiment one. The multimedia device can specifically be a television, a smart screen, a projection device, etc., or any electronic device that can output multimedia data such as video, audio, image and / or text.

[0145] An embodiment of the present application provides a visible light communication device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the visible light communication method in the above-mentioned embodiment 2.

[0146] Reference below Figure 6 , which shows a schematic structural diagram of a visible light communication device suitable for implementing an embodiment of the present application. Figure 6 The visible light communication device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0147] like Figure 6 As shown, the visible light communication device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the visible light communication device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the visible light communication device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a visible light communication device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or provided instead.

[0148] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0149] The visible light communication device provided in the embodiment of the present application adopts the visible light communication method in the above embodiment, which can improve the reliability of visible light communication in multimedia device applications. Compared with the prior art, the beneficial effects of the visible light communication device provided in the embodiment of the present application are the same as the beneficial effects of the visible light communication method provided in the above embodiment, and other technical features in the visible light communication device are the same as the features disclosed in the visible light communication method in the previous embodiment, which will not be repeated here.

[0150] It should be understood that the various parts disclosed in the embodiments of the present application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0151] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0152] An embodiment of the present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, and the computer-readable program instructions are used to execute the visible light communication method in the above-mentioned embodiment.

[0153] The computer-readable storage medium provided in the embodiment of the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0154] The computer-readable storage medium may be included in the visible light communication device; or may exist independently without being assembled into the visible light communication device.

[0155] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the visible light communication device, the visible light communication device: determines the dynamic carrier signal according to the data volume parameter of the initial multimedia signal through the visible light emitting device, and processes the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal; processes the visible light signal through the multimedia playback device to obtain a target multimedia signal, and outputs the playback content according to the target multimedia signal.

[0156] The computer program code for performing the operation of the embodiment of the present application can be written in one or more programming languages ​​or a combination thereof, and the above-mentioned programming languages ​​include object-oriented programming languages, such as Java, Smalltalk, C++, and also include conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on the remote computer, or completely on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0157] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0158] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0159] The readable storage medium provided in the embodiment of the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned visible light communication method, and can improve the reliability of visible light communication in multimedia device applications. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the embodiment of the present application are the same as the beneficial effects of the visible light communication method provided in the above-mentioned embodiment, and will not be repeated here.

[0160] The present application also provides a computer program product, including a computer program, which implements the steps of the visible light communication method as described above when the computer program is executed by a processor.

[0161] The computer program product provided by the present application can solve the problem of improving the reliability of visible light communication in multimedia device applications. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the visible light communication method provided by the above embodiment, which will not be repeated here.

[0162] The above are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A visible light communication system, characterized in that: The visible light communication system comprises: a visible light emitting device and a multimedia playing device, wherein the visible light emitting device and the multimedia playing device are connected to each other by optical communication; The visible light emitting device is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and process the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal; The multimedia playback device is used to process the visible light signal to obtain a target multimedia signal, and output playback content according to the target multimedia signal.

2. The visible light communication system according to claim 1, characterized in that: The visible light emitting device comprises: a coding modulation module, a hybrid compensation module, a DC bias module and a transmitting module; The coding and modulation module is used to determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal, and perform coding and modulation processing on the initial multimedia signal and the dynamic carrier signal to obtain a modulated multimedia signal; The hybrid compensation module is used to perform hybrid compensation processing on the modulated multimedia signal to obtain a multimedia signal to be transmitted; The DC bias module is used to perform DC bias processing on the multimedia signal to be transmitted to obtain a driving signal; The transmitting module is used to convert the driving signal into the visible light signal and send the visible light signal to the multimedia playback device.

3. The visible light communication system according to claim 2, characterized in that: The coding and modulation module comprises: a coding unit, a modulation unit and a carrier generation unit; The encoding unit is used to parse the data volume parameter of the initial multimedia signal, generate a dynamic excitation signal according to the data volume parameter, and encode the initial multimedia signal to obtain an encoded multimedia signal; The carrier generation unit is used to determine the dynamic carrier signal according to the dynamic excitation signal, wherein the carrier frequency of the dynamic carrier signal is proportional to the data amount parameter; The modulation unit is used to modulate the dynamic carrier signal through the encoded multimedia signal to obtain the modulated multimedia signal.

4. The visible light communication system according to claim 2, characterized in that: The hybrid compensation module includes: a bandwidth compensation unit, a gain compensation unit and a frequency compensation unit; The bandwidth compensation unit is used to perform bandwidth compensation on the modulated multimedia signal according to a preset compensation multiple to obtain a first compensated multimedia signal, wherein the compensation multiple is proportional to the data volume parameter; The gain compensation unit is used to perform gain compensation on the first compensated multimedia signal according to a preset gain multiple to obtain a second compensated multimedia signal, wherein the gain multiple is proportional to the data amount parameter; The frequency compensation unit is used to perform frequency amplitude compensation on the amplitude value of each frequency point in the second compensated multimedia signal according to a preset amplitude compensation coefficient to obtain the multimedia signal to be transmitted, wherein, for each frequency point, the amplitude compensation coefficient is inversely proportional to the amplitude value of the frequency point.

5. The visible light communication system according to claim 2, characterized in that: The visible light emitting device further comprises a first deflection control module, the emitting module comprises a first deflection unit and a visible light emitter, and the first deflection unit is fixedly connected to the visible light emitter; The first deflection control module is used to receive the spatial coordinate information sent by the multimedia playback device, and control the first deflection unit to deflect based on the spatial coordinate information; The first deflection unit is used to drive the visible light transmitter to adjust the signal transmission angle so that the visible light transmitter and the visible light receiver in the multimedia playback device are at an optimal signal alignment angle.

6. The visible light communication system according to claim 1, characterized in that: The multimedia playback device comprises: a receiving module, an amplifying module, an equalizing module, a demodulating module and a decoding module; The receiving module is used to receive the visible light signal and convert the visible light signal into an electrical signal; The amplification module is used to amplify the electrical signal to obtain an amplified electrical signal; The equalization module is used to perform equalization processing on the amplified electrical signal to obtain a balanced electrical signal; The demodulation module is used to demodulate the equalized electrical signal to obtain a coded multimedia signal; The decoding module is used to decode and post-process the encoded multimedia signal to obtain a target multimedia signal.

7. The visible light communication system according to claim 6, characterized in that: The multimedia playback device further includes a spatial processing module, and the receiving module includes a collection unit; The acquisition unit is used to acquire spatial information of the visible light emitter in the visible light emitting device; The space processing module is used to analyze the space information to obtain the space coordinate information of the visible light emitter, and send the space coordinate information to the first deflection control module of the visible light emitting device.

8. The visible light communication system according to claim 6, characterized in that: The multimedia playback device further includes a space processing module and a second deflection control module, the receiving module includes a collection unit, a second deflection unit and a visible light receiver, and the second deflection unit is fixedly connected to the visible light receiver; The acquisition unit is used to acquire spatial information of the visible light emitter in the visible light emitting device; The spatial processing module is used to analyze the spatial information to obtain the spatial coordinate information of the visible light emitter, and send the spatial coordinate information to the second deflection control module; The second deflection control module is used to control the second deflection unit to deflect based on the spatial coordinate information; The second deflection unit is used to drive the visible light receiver to adjust the signal receiving angle so that the visible light receiver and the visible light transmitter in the visible light transmitting device are at an optimal signal alignment angle.

9. A visible light communication method, characterized in that: Applied to a visible light communication system according to any one of claims 1 to 8, the visible light communication system comprising: a visible light emitting device and a multimedia playback device, wherein the visible light emitting device and the multimedia playback device are optically connected to each other; The method comprises: Determine the dynamic carrier signal according to the data volume parameter of the initial multimedia signal through the visible light emitting device, and process the initial multimedia signal and the dynamic carrier signal to obtain a visible light signal; The visible light signal is processed by the multimedia playback device to obtain a target multimedia signal, and playback content is output according to the target multimedia signal.

10. A multimedia device, characterized in that: The multimedia device includes the visible light communication system according to any one of claims 1 to 8.

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