Laser projection device and sound generation method for laser projection device

Abstract

A laser projection device, comprising: a main chip (411), a sound generation board (424), a plurality of oscillators to be selected, and a first audio signal processing circuit (423). The main chip (411) is configured to output, in a first sound generation mode, a first audio signal and a first control signal, and to output, in a second sound generation mode, a second audio signal and a second control signal. The first audio signal processing circuit is configured to: under the control of the first control signal, output the first audio signal by means of a target oscillator among the plurality of oscillators to be selected; or under the control of the second control signal, output the second audio signal by means of a first oscillator to be selected and a second oscillator to be selected among the plurality of oscillators to be selected.

Description

Laser projection device and sound generation method of laser projection device

[0001] This application claims priority to Chinese patent application No. 202311022909.2 filed on August 14, 2023, and priority to Chinese patent application No. 202311516203.1 filed on November 14, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the technical field of laser projection equipment, and in particular to a laser projection equipment and a sound generation method of the laser projection equipment. Background Art

[0003] With the development of optoelectronic technology, laser projection equipment is gaining increasing consumer acceptance. Laser projection equipment typically consists of a main unit and a screen. The screen is equipped with a sound board. The screen receives digital audio signals from the main unit to drive the vibrators on the sound board, producing sound on the screen.

[0004] Summary of the Invention

[0005] In one aspect, a laser projection device is provided, comprising: a main chip, a first wireless communication component, a second wireless communication component, a sounding board, a plurality of selected transducers, and a first audio signal processing circuit. The main chip is configured to output a first audio signal and a first control signal in a first sounding mode, and to output a second audio signal and a second control signal in a second sounding mode. The first wireless communication component is configured to input one of the first audio signal and the second audio signal output by the main chip into the first audio signal processing circuit. The second wireless communication component is configured to input one of the first control signal and the second control signal output by the main chip into the first audio signal processing circuit. The plurality of selected transducers are disposed in the sounding board and distributed at different locations on the sounding board. Furthermore, the first audio signal processing circuit is configured to output the first audio signal through a target transducer among the plurality of selected transducers under the control of the first control signal, or to output the second audio signal through the first and second selected transducers among the plurality of selected transducers under the control of the second control signal.

[0006] In another aspect, a laser projection device is provided, comprising a main unit and a screen. The main unit comprises a main board and a power board. The main board is configured to acquire audio data of at least one channel and modulate the audio data of the at least one channel into an analog audio signal in a first frequency band. The power board is configured to connect to a power supply circuit and rectify the power provided by the power supply circuit to power the main unit. The screen comprises a power adapter, a sound board, and a plurality of vibrators. The power adapter is configured to connect to the power supply circuit and rectify the power provided by the power supply circuit to power the screen. The plurality of vibrators are disposed in the sound board. The power board is further configured to transmit the analog audio signal to the power supply circuit. The power adapter is further configured to couple the analog audio signal from the power supply circuit. The sound board is configured to demodulate the analog audio signal coupled by the power adapter to acquire audio data of the at least one channel and, based on the audio data of the at least one channel, drive at least one of the plurality of vibrators to produce sound.

[0007] On the other hand, a sound-generating method for a laser projection device is provided. The laser projection device includes: a main chip, a first wireless communication component, a second wireless communication component, a first audio signal processing circuit, a plurality of vibrators to be selected, and a sound-generating plate. The plurality of vibrators to be selected are distributed at different positions on the sound-generating plate. The method includes: when the sound-generating mode of the laser projection device is the first sound-generating mode, outputting a first audio signal and a first control signal through the main chip, inputting the first audio signal into the first audio signal processing circuit through the first wireless communication component, and inputting the first control signal into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the first audio signal through a target vibrator among the plurality of vibrators to be selected under the control of the first control signal. In addition, when the sound emission mode of the laser projection device is the second sound emission mode, a second audio signal and a second control signal are output through the main chip, the second audio signal is input into the first audio signal processing circuit through the second wireless communication component, and the second control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the second audio signal through the first to be selected vibrator and the second to be selected vibrator among the multiple to be selected vibrators under the control of the second control signal.

[0008] In another aspect, a sound-generating method for a laser projection device is provided. The laser projection device includes a main unit and a screen. The main unit includes a main board and a power supply board. The screen includes a power adapter, a sound-generating board, and multiple vibrators disposed in the sound-generating board. The power supply board is connected to a power supply circuit and is configured to rectify the power provided by the power supply circuit to power the main unit. The power adapter is connected to the power supply circuit and is configured to rectify the power provided by the power supply circuit to power the screen. The method includes: obtaining audio data of at least one channel via the main board and modulating the audio data of the at least one channel into an analog audio signal in a first frequency band. The analog audio signal is transmitted to the power supply circuit via the power supply board. The analog audio signal is coupled from the power supply circuit via the power adapter. The analog audio signal coupled by the power adapter is demodulated by the power adapter to obtain audio data of the at least one channel, and at least one of the multiple vibrators is driven to generate sound based on the audio data of the at least one channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic diagram showing the distribution of vibrators in a sounding board provided by the related art;

[0010] FIG2 is a block diagram of a laser projection device according to some embodiments;

[0011] FIG3 is a schematic diagram of the distribution of vibrators on a sounding board of a laser projection device according to some embodiments;

[0012] FIG4 is a diagram illustrating a layer structure of a sound-emitting plate of a laser projection device according to some embodiments;

[0013] FIG5 is a block diagram of another laser projection device according to some embodiments;

[0014] FIG6 is a block diagram of yet another laser projection device according to some embodiments;

[0015] FIG7 is a block diagram of yet another laser projection device according to some embodiments;

[0016] FIG8 is a block diagram of yet another laser projection device according to some embodiments;

[0017] FIG9 is a flow chart of a sound generation method of a laser projection device according to some embodiments;

[0018] FIG10 is a flow chart of another method for emitting sound using a laser projection device according to some embodiments;

[0019] FIG11 is a schematic diagram of multiple image blocks obtained by segmenting a video image frame according to some embodiments;

[0020] FIG12 is a schematic diagram of a projection scene of a laser projection device according to some embodiments;

[0021] FIG13 is a block diagram of a laser projection device and a power supply circuit according to some implementations;

[0022] FIG14 is a block diagram of a mainboard of a laser projection device according to some implementations;

[0023] 15 is a block diagram of a power supply board of a laser projection device according to some implementations;

[0024] FIG16 is a block diagram of a power adapter for a laser projection device according to some implementations;

[0025] 17 is a circuit diagram of a first coupling circuit of a laser projection device according to some implementations;

[0026] 18 is a block diagram of a sound board of a laser projection device according to some implementations;

[0027] FIG19 is a circuit diagram of a third-order bandpass Butterworth filter for a laser projection device according to some implementations;

[0028] 20 is a block diagram of another sounding board of a laser projection device according to some implementations;

[0029] 21 is a block diagram of another power supply board for a laser projection device according to some implementations;

[0030] 22 is a circuit diagram of a second coupling circuit of a laser projection device according to some implementations;

[0031] FIG23 is a block diagram of another mainboard of a laser projection device according to some implementations;

[0032] 24 is a flow chart of a method for emitting sound in a laser projection device according to some implementations. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings to clearly and completely describe some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0034] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0035] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0036] When describing some embodiments, the word "connected" and its derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connected" can mean fixed connection, detachable connection, or integration; it can be directly connected or indirectly connected through an intermediate medium.

[0037] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0038] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0039] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0040] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0041] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0042] As shown in Figure 1, a laser projection device in the related art includes a main unit and a screen. A sound plate 424 is provided in the screen. Vibrators A, B, C, D, E, F, and G are provided on the sound plate 424. Vibrator A corresponds to the left surround channel, vibrator B corresponds to the left main channel, vibrator C corresponds to the center channel, vibrator D corresponds to the right main channel, vibrator E corresponds to the right main channel, vibrator F corresponds to the left rear surround channel, and vibrator G corresponds to the right rear surround channel. When the laser projection device plays a video containing human voice, the sound plate 424 can vibrate by driving vibrators B, C, and D to output the human voice.

[0043] However, in order to support multiple channels and multiple sound modes, the laser projection device is respectively provided with independent audio signal processing circuits and multiple vibrators corresponding to different channels and different sound modes, which will lead to an increase in the number of audio signal processing circuits and vibrators in the laser projection device, and further increase the manufacturing process difficulty and manufacturing cost of the laser projection device.

[0044] To address the aforementioned technical issues, some embodiments of the present disclosure provide a laser projection device 40. By improving the distribution of oscillators on a sounding board, the laser projection device can achieve different sounding modes using a single set of audio signal processing circuits and oscillators. This reduces the number of audio signal processing circuits and oscillators in the laser projection device 40, thereby reducing the manufacturing process difficulty and manufacturing cost of the laser projection device 40. In some embodiments, the laser projection device 40 may be a laser TV, a projector, or the like.

[0045] As shown in Figure 2, laser projection device 40 includes a host 41 (laser TV host) and a screen 42 (laser TV screen). Host 41 communicates with screen 42 via multiple wireless communication components to transmit various signals to screen 42. Some embodiments of the present disclosure will be described in detail below.

[0046] As shown in Figures 2 and 3, screen 42 includes a sound plate 424 (screen sound plate). Sound plate 424 is provided with vibrators Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9, Z10, Z11, Z12, and Z13. Vibrators Z1 through Z9 can be arranged in an array (e.g., uniformly arranged) in different areas of sound plate 424. In some embodiments, vibrators Z1 through Z9 can be arranged in a 3×3 array.

[0047] In some embodiments of the present disclosure, based on the distribution of the vibrators shown in FIG3 , the laser projection device 40 is configured to be switchable between two sound emission modes, including a first sound emission mode and a second sound emission mode.

[0048] When the laser projection device 40 switches its sound emission mode to the first sound emission mode, the laser projection device 40 selects a corresponding vibrator from vibrators Z1 to Z9 based on the position of the sound-emitting object (e.g., a person) relative to the screen 42. The vibrator is driven to vibrate by the center channel signal to output the sound emitted by the sound-emitting object. It should be noted that vibrators Z1 to Z9 are merely examples based on the aforementioned division of the number of vibrators, and the present disclosure is not limited thereto.

[0049] In this case, vibrator Z10 corresponds to the left surround channel, vibrator Z11 corresponds to the right surround channel, vibrator Z12 corresponds to the left rear surround channel, and vibrator Z13 corresponds to the right rear surround channel. When the laser projection device 40 plays a video, the laser projection device 40 can drive vibrators Z10 and Z11 to vibrate using the audio signals of the left and right surround channels to output left and right surround channel signals, and can drive vibrators Z12 and Z13 to vibrate using the audio signals of the left and right rear surround channels to output left and right rear surround channel signals. The surround channel signals and the rear surround channel signals can be sound signals (such as ambient sound or background sound) that do not contain corresponding sound-emitting objects in the video frames of the video played by the laser projection device 40.

[0050] When the laser projection device 40 switches to the second sound emission mode, the sound emission modes of vibrators Z10, Z11, Z12, and Z13 are the same as those in the first sound emission mode described above. It should be noted that vibrators Z10 through Z13 are merely provided for illustration based on the aforementioned division of the number of vibrators, and the present disclosure is not limited thereto.

[0051] Some embodiments of the present disclosure do not limit the combination of vibrators Z1 through Z13. In some embodiments, vibrators Z1 through Z6 are configured to output the sound emitted by sound-emitting objects, while vibrators Z7 through Z13 serve as surround sound channels, outputting ambient sound, background sound, and the like. It is understood that vibrators Z1 through Z13 can also be combined in other ways, which will not be further described here.

[0052] Some embodiments of the present disclosure do not limit the number of vibrators. In some embodiments, the screen 42 may include more or fewer vibrators. In some embodiments, the screen 42 may also include 6, 9, 12, 15, 18, or 20 vibrators.

[0053] The main difference between the second sound emission mode and the first sound emission mode is that in the second sound emission mode, when the played video frame contains the sound emitted by the corresponding sound-emitting object, the laser projection device 40 will select two vibrators from vibrators Z1 to Z9 as the vibrators corresponding to the left main channel and the right main channel, and output the sound emitted by the corresponding sound-emitting object through the vibration of the vibrators corresponding to the left main channel and the right main channel.

[0054] In some embodiments, vibrator Z4 can be selected as the vibrator corresponding to the left main channel, and vibrator Z6 can be selected as the vibrator corresponding to the right main channel, and the human voice in the video played by the laser projection device 40 can be output through the vibration of vibrator Z4 and vibrator Z6.

[0055] Based on the distribution of vibrators on the sound board of the above-mentioned laser projection device 40, on the one hand, the human voice of the center channel can be played with the help of the vibrators corresponding to the sound-emitting objects among vibrators Z1 to Z9 to achieve the effect of the first sound mode. On the other hand, the sounds of the left main channel and the right main channel can be played with the help of vibrators Z4 and Z6 to achieve the human voice playback in the second sound mode, thereby improving the flexibility of the sound mode of the laser projection device 40.

[0056] As shown in Figure 3, some embodiments of the present disclosure improve the membrane structure of a sounding plate 424. The sounding plate 424 may include a first skin layer 310, a first adhesive film layer 320 located on the first skin layer 310, a honeycomb core layer 330 located on the first adhesive film layer 320, a second adhesive film layer 340 located on the honeycomb core layer 330, and a second skin layer 350 located on the second adhesive film layer 340. A plurality of selectable oscillators are mounted below the first skin layer 310, such as on a side of the first skin layer 310 away from the second skin layer 350.

[0057] In some embodiments, the layer structure of the sounding plate 424 in FIG. 2 and FIG. 3 may be as shown in FIG. 4 , and the vibrators Z1 to Z13 shown in FIG. 3 may be mounted below the first skin layer 310 in the sounding plate 424 .

[0058] In some embodiments, the thickness of the first skin layer 310 and the second skin layer 350 may be 0.12 mm.

[0059] In some embodiments, the honeycomb core layer 330 may have a thickness of 0.03 mm.

[0060] In some embodiments, the thickness of the sounding plate 424 is less than or equal to 8 mm. In some embodiments, the thickness of the sounding plate 424 is any value between 1 mm and 8 mm. In some embodiments, the thickness of the sounding plate 424 is 1 mm, 2 mm, 4 mm, 6 mm, or 8 mm.

[0061] In some embodiments, the first skin layer 310 and the second skin layer 350 can be made of fiberglass as the skin material. In some embodiments, the fiberglass has a density of 209 grams per square meter (g / m2).

[0062] As shown in Table 1 below, Table 1 shows parameters of the skin layer thickness, honeycomb core layer wall thickness and thickness of the sounding panel 424 in some embodiments of the present disclosure, as well as corresponding parameters of sounding panels in related technologies.

[0063] Table 1

[0064] As can be seen from Table 1, the skin layer (such as the first skin layer 310 and the second skin layer 350) of the sounding board in some embodiments of the present disclosure has a thickness of 0.12 millimeters (mm), while the skin layer thickness of the sounding board in the related art is 0.5 mm. The honeycomb core layer wall thickness of the sounding board in some embodiments of the present disclosure is 0.03 mm, while the honeycomb core layer wall thickness of the sounding board in the related art is 0.05 mm. The thickness of the sounding board in some embodiments of the present disclosure is 8 mm, while the thickness of the sounding board in the related art is 15 mm.

[0065] It can be understood that the sounding board in some embodiments of the present disclosure has a thinner thickness compared with the parameters of the sounding board in the related art, thereby reducing the weight of the sounding board.

[0066] In some embodiments, as shown in FIG. 1 , the host 41 includes a main chip 411 , a wireless transmitter 412 of a first wireless communication component connected to the main chip 411 , and a wireless transmitter 413 of a second wireless communication component.

[0067] Screen 42 includes a wireless receiving terminal 421 of a first wireless communication component, a wireless receiving terminal 422 of a second wireless communication component, a first audio signal processing circuit 423, and a sounding board 424 having a plurality of vibrators to be selected distributed at different positions. In some embodiments, laser projection device 40 includes a plurality of vibrators to be selected and sounding board 424, wherein the plurality of vibrators to be selected are disposed in sounding board 424 and distributed at different positions on sounding board 424.

[0068] The wireless receiving end 421 of the first wireless communication component is connected to the input end of the first audio signal processing circuit 423, the wireless receiving end 422 of the second wireless communication component is connected to the control end of the first audio signal processing circuit 423, and the sounding board 424 is connected to the output end of the first audio signal processing circuit 423.

[0069] In some embodiments, the first wireless communication component is configured to input the audio signal output by the main chip 411 into the first audio signal processing circuit 423. In some embodiments, the main chip 411 first inputs the audio signal into the wireless transmitter 412 of the first wireless communication component, then the wireless transmitter 412 of the first wireless communication component sends the audio signal to the wireless receiver 421 of the first wireless communication component, and finally the wireless receiver 421 of the first wireless communication component inputs the audio signal into the input end of the first audio signal processing circuit 423.

[0070] In some embodiments, the first wireless communication component can support 5.2 GHz signal transmission. In some embodiments, the first wireless communication component can convert the audio signal into a 5.2 GHz radio frequency signal for transmission, and the audio signal can be a signal of the left and right main channels or the center channel.

[0071] In some embodiments, the second wireless communication component is configured to input the control signal output by the main chip 411 to the first audio signal processing circuit 423. In some embodiments, the main chip 411 first inputs the audio signal to the wireless transmitter 413 of the second wireless communication component, then the wireless transmitter 413 of the second wireless communication component sends the audio signal to the wireless receiver 422 of the second wireless communication component, and finally the wireless receiver 422 of the second wireless communication component inputs the audio signal to the control terminal of the first audio signal processing circuit 423.

[0072] In some embodiments, the second wireless communication component may support 433 MHz signal transmission. In some embodiments, the second wireless communication component may convert the control signal into a 433 MHz radio frequency signal for transmission.

[0073] In some embodiments of the present disclosure, since the first wireless communication component supports 5.2 GHz signal transmission and the second wireless communication component supports 433 MHz signal transmission, when radio frequency signals are transmitted simultaneously through the first wireless communication component and the second wireless communication component, interference between the radio frequency signals transmitted by the two wireless communication components can be avoided based on different frequencies.

[0074] In some embodiments, the control signal may include an identifier of the sounding mode and a number of the vibrator.

[0075] In some embodiments, the main chip 411 is configured to output a first audio signal and a first control signal in a first sound emission mode, and to output a second audio signal and a second control signal in a second sound emission mode.

[0076] In some embodiments, in the first sound mode, the main chip 411 can output a first audio signal and a first control signal, and input the first audio signal to the first audio circuit via the first wireless communication component, and input the first control signal to the first audio circuit via the second wireless communication component. In the second sound mode, the main chip 411 can output a second audio signal and a second control signal, and input the second audio signal to the first audio circuit via the first wireless communication component, and input the second control signal to the first audio circuit via the second wireless communication component.

[0077] In some embodiments, the first audio signal processing circuit 423 is configured to output a first audio signal through a target vibrator among multiple vibrators to be selected under the control of a first control signal, or to output a second audio signal through a first vibrator to be selected and a second vibrator to be selected among multiple vibrators to be selected under the control of a second control signal.

[0078] In some embodiments, in the first sound emission mode, the first audio signal processing circuit 423 is configured to output the first audio signal through the target vibrator among the multiple to-be-selected vibrators under the control of the first control signal. In the second sound emission mode, the first audio signal processing circuit 423 is configured to output the second audio signal through the first to-be-selected vibrator and the second to-be-selected vibrator among the multiple to-be-selected vibrators under the control of the second control signal.

[0079] In summary, the laser projection device 40 provided in some embodiments of the present disclosure includes: a main chip, a first wireless communication component, a second wireless communication component, a first audio signal processing circuit and a sound board, in which a plurality of vibrators to be selected are distributed at different positions.

[0080] The main chip can output a first audio signal and a first control signal in a first sound mode, and output a second audio signal and a second control signal in a second sound mode. The first wireless communication component can input the audio signal output by the main chip into the first audio signal processing circuit, and the second wireless communication component can input the control signal output by the main chip into the first audio signal processing circuit. The first audio signal processing circuit can output the first audio signal through a target vibrator among multiple vibrators to be selected under the control of the first control signal, or output the second audio signal through a first vibrator to be selected and a second vibrator to be selected among multiple vibrators to be selected under the control of the second control signal.

[0081] It can be understood that since the first audio signal output by the main chip in the first sound mode and the second audio signal output in the second sound mode are both output through the first audio signal processing circuit and a vibrator from a plurality of selected vibrators, some embodiments of the present disclosure can reduce the number of audio signal processing circuits and vibrators in the laser projection device 40 by allowing the laser projection device 40 to share the audio signal processing circuit and the vibrator in the first sound mode and the second sound mode, thereby reducing the manufacturing process difficulty and manufacturing cost of the laser projection device 40.

[0082] In some embodiments, the main chip 411 is further configured to: when the sound mode of the laser projection device 40 is the first sound mode, obtain the video image frame displayed by the laser projection device 40; divide the video image frame into multiple image blocks according to the distribution positions of multiple vibrators to be selected in the sound plate 424; if the facial features of a living organism are identified from the target image block among the multiple image blocks, then intercept the facial image of the living organism in the target image block; if it is determined that the corresponding living organism in the facial image of the living organism has a sound action by identifying the key points of the mouth in the facial image of the living organism, then determine the vibrator to be selected corresponding to the target image block as the target vibrator.

[0083] In some embodiments, based on the laser projection device 40 shown in FIG. 1 , referring to FIG. 5 , the first audio signal processing circuit 423 includes: a first power amplifier 4231 , a first analog switch 4232 , and a second analog switch 4233 .

[0084] The first power amplifier 4231 is configured to: under the control of a first control signal, amplify the first audio signal based on a first audio processing parameter to obtain a first audio signal to be output; and, under the control of a second control signal, amplify the second audio signal based on a second audio processing parameter to obtain a second audio signal to be output.

[0085] In some embodiments, the first power amplifier 4231 is configured to: in a first sound emission mode, amplify the first audio signal based on a first audio processing parameter; and in a second sound emission mode, amplify the second audio signal based on a second audio processing parameter.

[0086] In some embodiments, the audio processing parameters (such as at least one of the first audio processing parameter or the second audio processing parameter) include but are not limited to at least one of the following parameters: number of channels, output power, maximum output voltage, and maximum output current.

[0087] Typically, different audio processing parameters are set in the laser projection device 40 for different sound channels to achieve matching amplification effects of each sound channel. Therefore, in some embodiments of the present disclosure, different audio processing parameters are configured for the first audio signal and the second audio signal, which is beneficial to improving the amplification effects of the sound channels in the first sound emission mode and the second sound emission mode.

[0088] The first analog switch 4232 is configured to: under the control of the first control signal, input the first audio signal to be output into the target vibrator, so as to output the first audio signal to be output through the target vibrator.

[0089] In some embodiments, the first analog switch 4232 may include an analog switch corresponding to any one of a plurality of to-be-selected vibrators. In this case, the first analog switch 4232 is further configured to, under the control of the first control signal, turn on the analog switch corresponding to the target vibrator and turn off all analog switches except the analog switch corresponding to the target vibrator, so as to output the first audio signal to be output through the target vibrator.

[0090] The second analog switch 4233 is configured to: under the control of the second control signal, input the second audio signal to be output into the first to-be-selected transducer and the second to-be-selected transducer, so as to output the second audio signal to be output through the first to-be-selected transducer and the second to-be-selected transducer.

[0091] In some embodiments, the first analog switch 4232 may include analog switches corresponding to the first and second vibrators to be selected. In this case, the second analog switch 4233 is further configured to, under the control of the second control signal, turn on the analog switches corresponding to the first and second vibrators to be selected, so as to output the second audio signal to be output through the first and second vibrators to be selected.

[0092] In some embodiments, based on the laser projection device 40 shown in FIG. 1 or FIG. 5 , referring to FIG. 6 , the host 41 further includes a wireless transmitter 414 of a third wireless communication component. The screen 42 further includes a wireless receiver 425 of the third wireless communication component and a second audio signal processing circuit 426. The sound board 424 is further provided with a left surround vibrator (vibrator Z10), a right surround vibrator (vibrator Z11), a left rear surround vibrator (vibrator Z12), and a right rear surround vibrator (vibrator Z13).

[0093] The main chip 411 is further configured to output a third audio signal and a fourth audio signal. It should be noted that the main chip 411 can output the third audio signal and the fourth audio signal no matter in the first sound emission mode or the second sound emission mode.

[0094] The third wireless communication component is configured to input the third audio signal and the fourth audio signal output by the main chip 411 into the second audio signal processing circuit respectively.

[0095] In some embodiments, the main chip 411 first inputs the third audio signal and the fourth audio signal into the wireless transmitting end 414 of the third wireless communication component, then, the wireless transmitting end 414 of the third wireless communication component sends the audio signal to the wireless receiving end 425 of the third wireless communication component, and finally, the wireless receiving end 425 of the third wireless communication component inputs the audio signal into the input end of the second audio signal processing circuit 426.

[0096] In some embodiments, the third wireless communication component may support 5.8 GHz signal transmission. In some embodiments, the third wireless communication component may convert the audio signal into a 5.8 GHz radio frequency signal for transmission.

[0097] The second audio signal processing circuit 426 is configured to output the third audio signal through the left surround element and the right surround element, and to output the fourth audio signal through the left rear surround element and the right rear surround element.

[0098] To sum up, in the laser projection device 40 provided in some embodiments of the present disclosure, the first digital audio signal of the left and right surround channels, as well as the third audio signal and the fourth audio signal of the left and right rear surround channels can also be transmitted between the host and the screen, and the processed third audio signal (the third audio signal to be output) is sent to the left surround vibrator and the right surround vibrator, and the processed fourth audio signal (the fourth audio signal to be output) is sent to the left rear surround vibrator and the right rear surround vibrator.

[0099] In this way, the left surround vibrator, the right surround vibrator, the left rear surround vibrator and the right rear surround vibrator can be driven to vibrate to play surround sound, thereby achieving a multi-channel sound effect.

[0100] In some embodiments, based on the laser projection device 40 shown in FIG. 6 , referring to FIG. 7 , the second audio signal processing circuit 426 includes: a second power amplifier 4261 and a third power amplifier 4262 .

[0101] The second power amplifier 4261 is configured to: amplify the third audio signal to obtain a third audio signal to be played, and input the third audio signal to be output into the left surround vibrator and the right surround vibrator to output the third audio signal to be output through the left surround vibrator and the right surround vibrator.

[0102] The third power amplifier 4262 is configured to: amplify the fourth audio signal to obtain a fourth audio signal to be played, and input the fourth audio signal to be output into the left rear surround vibrator and the right rear surround vibrator to output the fourth audio signal to be output through the left rear surround vibrator and the right rear surround vibrator.

[0103] In some embodiments, the main chip 411 includes an integrated circuit having a built-in first audio bus (Inter-IC Sound, I2S) interface. The main chip 411 is connected to the wireless transmitter 412 of the first wireless communication component via the first audio bus interface.

[0104] The main chip 411 further includes a bidirectional two-wire synchronous serial bus (Inter-Integrated Circuit, I2C) interface and a universal serial bus (USB) interface, and can be connected to the second wireless communication component 413 through either the bidirectional two-wire synchronous serial bus interface or the USB interface.

[0105] The main chip 411 further includes a second audio bus interface and a third audio bus interface, and can be connected to the wireless transmitter 414 of the third wireless communication component through the second audio bus interface and the third audio bus interface.

[0106] Based on this, the main chip 411 is configured to: send a first audio signal or a second audio signal to the wireless transmitter 412 of the first wireless communication component through the first audio bus interface, send a first control signal or a second control signal to the wireless transmitter 413 of the second wireless communication component through one of the audio bus interface or the USB interface, send a third audio signal to the wireless transmitter 414 of the third wireless communication component through the second audio bus interface, and send a fourth audio signal to the wireless transmitter 414 of the third wireless communication component through the third audio bus interface.

[0107] It should be noted that the audio bus is a bus standard developed for audio data transmission between digital audio devices. It uses independent wires to transmit clock and data signals. By separating the data and clock signals, distortion caused by time difference is avoided.

[0108] The I²C bus is a bidirectional, two-wire synchronous serial bus that uses only two wires to transmit information between connected devices. In hardware, the I²C interface is integrated into the chip, eliminating the need for dedicated interface circuitry. Furthermore, the on-chip interface circuitry's filters can filter out glitches in the bus data. Therefore, the I²C bus simplifies hardware circuit wiring, reduces system costs, and improves system reliability.

[0109] It should be noted that the first I2C interface, the second I2C interface, and the third I2C interface involved in some embodiments of the present disclosure are all I2C interfaces, and the descriptions of "first" and "second" here are to distinguish different I2C interfaces.

[0110] In some embodiments, based on the laser projection device 40 shown in FIG7 , referring to FIG8 , the host 41 further includes a motherboard 11 . The main chip 411 and the wireless transmitter 413 of the second wireless communication component are disposed in the motherboard 11 .

[0111] The screen 42 further includes a sound effect board 420 , in which the wireless receiving end 422 of the second wireless communication component, the first audio signal processing circuit 423 , and the second audio signal processing circuit 426 are all disposed.

[0112] The sound board 420 is provided with a step-down chip 427. The step-down chip 427 can be connected to a power adapter. The step-down chip 427 can be a direct current (DCDC) chip that can convert the input 19V voltage to 3.3V voltage, thereby achieving voltage reduction. The power adapter can convert 220V AC power into 19V DC power to supply the DCDC chip on the sound board. The DCDC chip can convert the input 19V voltage into 3.3V voltage, thereby powering the various amplifiers and wireless modules on the sound board.

[0113] Based on the laser projection device 40 shown in FIG1 , some embodiments of the present disclosure further provide a sound emitting method of the laser projection device 40 . Referring to FIG9 , the sound emitting method of the laser projection device 40 includes steps S901 to S903 .

[0114] In step S901 , the sound emission mode of the laser projection device 40 is determined.

[0115] In some embodiments, a mode selection interface or a physical button for mode selection is provided in the host for the user to select a sound mode.

[0116] In some embodiments, a selection control corresponding to the first sound mode and a selection control corresponding to the second sound mode can be configured in the mode selection interface. When the user inputs a touch operation on the selection control corresponding to the first sound mode, the sound mode of the laser projection device 40 is determined to be the first sound mode. When the user inputs a touch operation on the selection control corresponding to the second sound mode, the sound mode of the laser projection device 40 is determined to be the second sound mode.

[0117] In some embodiments, a switch control corresponding to the first sound mode can be configured in the mode selection interface. When the user turns on the switch control corresponding to the first sound mode, the sound mode of the laser projection device 40 is determined to be the first sound mode. When the user turns off the switch control corresponding to the first sound mode, the sound mode of the laser projection device 40 is determined to be the second sound mode.

[0118] In step S901, if it is determined that the sound emission mode of the laser projection device 40 is the first sound emission mode, the following step S902 is executed:

[0119] In step S902, a first audio signal and a first control signal are output through the main chip, the first audio signal is input into the first audio signal processing circuit through the first wireless communication component, and the first control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the first audio signal through a target vibrator among multiple selected vibrators under the control of the first control signal.

[0120] In some embodiments, the first audio signal may be an audio signal of a center channel, and the first control signal may include a first sound emission mode and a transducer number of a target transducer.

[0121] In the above step S901, if it is determined that the sound emission mode of the laser projection device 40 is the second sound emission mode, the following step S903 is executed:

[0122] In step S903, a second audio signal and a second control signal are output through the main chip, the second audio signal is input into the first audio signal processing circuit through the second wireless communication component, and the second control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the second audio signal through the first to be selected vibrator and the second to be selected vibrator among the multiple to be selected vibrators under the control of the second control signal.

[0123] In some embodiments, the second audio signal may be audio signals of left and right main channels, and the second control signal may include the second sound emission mode, the transducer number of the first to-be-selected transducer, and the transducer number of the second to-be-selected transducer.

[0124] Some embodiments of the present disclosure provide a sound emission method for a laser projection device 40. When the sound emission mode of the laser projection device 40 is a first sound emission mode, a first audio signal and a first control signal are output through a main chip, the first audio signal is input into a first audio signal processing circuit through a first wireless communication component, and the first control signal is input into the first audio signal processing circuit through a second wireless communication component, so that the first audio signal processing circuit outputs the first audio signal through a target vibrator among a plurality of vibrators to be selected under the control of the first control signal.

[0125] Moreover, when the sound emission mode of the laser projection device 40 is the second sound emission mode, the second audio signal and the second control signal are output through the main chip, the second audio signal is input into the first audio signal processing circuit through the second wireless communication component, and the second control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the second audio signal through the first to be selected vibrator and the second to be selected vibrator among the multiple to be selected vibrators under the control of the second control signal.

[0126] It can be understood that since the first audio signal output by the main chip in the first sound emission mode and the second audio signal output in the second sound emission mode are both output through the first audio signal processing circuit and a vibrator among a plurality of selected vibrators, some embodiments of the present disclosure can reduce the number of audio signal processing circuits and vibrators in the laser projection device 40 by allowing the laser projection device 40 to share the audio signal processing circuit and the vibrator in the first sound emission mode and the second sound emission mode, thereby reducing the manufacturing process difficulty and manufacturing cost of the laser projection device 40.

[0127] Some embodiments of the present disclosure provide another sound emitting method of a laser projection device 40 . Referring to FIG. 10 , the sound emitting method of the laser projection device 40 includes steps S101 to S107 .

[0128] In step S101 , the sound emission mode of the laser projection device 40 is determined.

[0129] In the above step S101 , if the sound emission mode of the laser projection device 40 is the first sound emission mode, the following steps S102 to S106 are executed.

[0130] In step S102 , the video image frame displayed by the laser projection device 40 is acquired.

[0131] In step S103 , the video image frame is divided into a plurality of image blocks according to the distribution positions of the plurality of vibrators to be selected in the sounding board.

[0132] In some embodiments, referring to FIG. 11 , FIG. 11 illustrates an example in which the plurality of vibrators to be selected are nine vibrators to be selected (e.g., vibrators Z1 to Z9), and the nine vibrators to be selected are evenly distributed on the sounding board in a 3×3 array. Thus, based on the distribution of the nine vibrators to be selected on the sounding board, the video image frame 110 can be segmented into nine image blocks. The nine image blocks include: image block P1, image block P2, image block P3, image block P4, image block P5, image block P6, image block P7, image block P8, and image block P9.

[0133] In step S104 , if facial features of a living being are recognized from a target image block among the plurality of image blocks, a facial image of the living being in the target image block is captured.

[0134] In some embodiments, if facial features of a living being are recognized in image block P5 among the nine image blocks, the facial image of the living being in image block E is captured.

[0135] It can be understood that when facial features of a living being are recognized in other image blocks among the nine image blocks, facial images of the living being in the other image blocks are captured.

[0136] In step S105 , if it is determined that the corresponding living being in the facial image has a vocalization action by identifying the mouth key points in the facial image of the living being, the candidate vibrator corresponding to the target image block is determined as the target vibrator.

[0137] In some embodiments, since the vibrator corresponding to the image block P5 is the vibrator Z5, if it is determined that the organism corresponding to the facial image of the organism in the image block P5 has a vocal action by identifying the mouth key points in the facial image of the organism, then the vibrator Z5 is determined as the target vibrator.

[0138] In step S106, the first audio signal and the first control signal are output through the main chip, the first audio signal is input into the first audio signal processing circuit through the first wireless communication component, and the first control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the first audio signal through the target vibrator among the multiple vibrators to be selected under the control of the first control signal.

[0139] In the above step S101, if the sound emission mode of the laser projection device 40 is the second sound emission mode, the following step S107 is executed:

[0140] In step S107, a second audio signal and a second control signal are output through the main chip, the second audio signal is input into the first audio signal processing circuit through the second wireless communication component, and the second control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the second audio signal through the first to be selected transducer and the second to be selected transducer among the multiple to be selected transducers under the control of the second control signal.

[0141] In some embodiments, under the control of a first control signal, a first audio signal is output through a target vibrator among multiple vibrators to be selected, including: under the control of the first control signal, amplifying the first audio signal based on a first audio processing parameter to obtain a first audio signal to be output, and under the control of the first control signal, inputting the first audio signal to be output into the target vibrator to output the first audio signal to be output through the target vibrator.

[0142] In some embodiments, under the control of a second control signal, a second audio signal is output through a first to be selected vibrator and a second to be selected vibrator among a plurality of to be selected vibrators, including: under the control of the second control signal, amplifying the second audio signal based on a second audio processing parameter to obtain a second to be output audio signal, and under the control of the second control signal, inputting the second to be output audio signal into the first to be selected vibrator and the second to be selected vibrator to output the second to be output audio signal through the first to be selected vibrator and the second to be selected vibrator.

[0143] In some embodiments, some embodiments of the present disclosure provide a sound emitting method of a laser projection device 40, further including: outputting a third audio signal and a fourth audio signal through a main chip, inputting the third audio signal and the fourth audio signal into a second audio signal processing circuit; outputting the third audio signal through a left surround vibrator and a right surround vibrator, and outputting the fourth audio signal through a left rear surround vibrator and a right rear surround vibrator.

[0144] In some embodiments, outputting a third audio signal through the left surround vibrator and the right surround vibrator includes: amplifying the third audio signal to obtain a third audio signal to be played, and inputting the third audio signal to be output into the left surround vibrator and the right surround vibrator to output the third audio signal to be output through the left surround vibrator and the right surround vibrator.

[0145] In some embodiments, outputting a fourth audio signal through the left rear surround vibrator and the right rear surround vibrator includes: amplifying the fourth audio signal to obtain a fourth audio signal to be played, and inputting the fourth audio signal to be output into the left rear surround vibrator and the right rear surround vibrator to output the fourth audio signal to be output through the left rear surround vibrator and the right rear surround vibrator.

[0146] In some embodiments, inputting the first audio signal or the second audio signal into the first audio signal processing circuit includes: sending the first audio signal or the second audio signal to a wireless transmitter of the first wireless communication component through the first audio bus interface.

[0147] In some embodiments, inputting the first control signal or the second control signal into the first audio signal processing circuit includes: sending the first control signal or the second control signal to the wireless transmitter of the second wireless communication component through one of the audio bus interface or the USB interface.

[0148] In some embodiments, inputting the third audio signal and the fourth audio signal into the second audio signal processing circuit includes: sending the third audio signal to the wireless transmitter of the third wireless communication component through the second audio bus interface, and sending the fourth audio signal to the wireless transmitter of the third wireless communication component through the third audio bus interface.

[0149] Some embodiments of the present disclosure further provide another laser projection device 40, as shown in FIG12 , which includes a host 41 and a screen 42. The host 41 is configured to project a display image onto the screen 42 based on laser light, and the screen 42 is configured to display the display image projected by the host 41.

[0150] A sounding plate 424 and a plurality of vibrators 220 disposed within the sounding plate 424 are disposed within the screen 42. The screen 42 is further configured to enable the laser projection device 40 to produce sound through the sounding plate 424. Furthermore, the host 41 and screen 42 are each connected to a power supply circuit 300 via power lines, which is configured to supply power to the host 41 and screen 42.

[0151] In some embodiments of the present disclosure, as shown in FIG13 , the host 41 includes a mainboard 11 and a power board 12 . The screen 42 includes a power adapter 21 , a sound board 424 , and a plurality of vibrators 220 disposed in the sound board 424 .

[0152] The power board 12 is connected to the power supply circuit 300 and is configured to rectify the power provided by the power supply circuit 300 to power the host 41. The power adapter 21 is connected to the power supply circuit 300 and is configured to rectify the power provided by the power supply circuit 300 to power the screen 42.

[0153] The main board 11 is configured to obtain audio data from at least one channel and modulate the audio data from the at least one channel into an analog audio signal in a first frequency band. The power board 12 is further configured to transmit the analog audio signal to the power supply circuit 300. The power adapter 21 is further configured to couple the analog audio signal from the power supply circuit. The sound board 424 is configured to demodulate the analog audio signal coupled from the power adapter to obtain audio data from at least one channel, and to drive at least one of the multiple vibrators 220 to produce sound based on the audio data from the at least one channel.

[0154] In some embodiments, the mainboard 11 is configured to receive audio data transmitted via an interface such as the Internet, a High Definition Multimedia Interface (HDMI), or a Universal Serial Bus (USB).

[0155] In some embodiments of the present disclosure, the number and arrangement of the vibrators provided in the sounding board are not limited. Driving at least one of the multiple vibrators to produce sound based on audio data of at least one channel means: driving the vibrators corresponding to each channel to produce sound based on the audio data of each channel.

[0156] In some embodiments, the audio data of the at least one channel includes audio data of a first channel and audio data of a second channel.

[0157] In some embodiments, the vibrators corresponding to the first channel are vibrators X1 and X2, and the vibrators corresponding to the second channel are vibrators X3 and X4. Driving at least one of the multiple vibrators to produce sound based on audio data from at least one channel includes: driving vibrators X1 and X2 to produce sound based on audio data from the first channel, and driving vibrators X3 and X4 to produce sound based on audio data from the second channel.

[0158] In some embodiments, the first frequency band is [3 MHz, 5.5 MHz].

[0159] In some embodiments, the input of the power board 12 (power provided by the power supply circuit 300 ) is 220V AC power, and the output of the power board 12 is 12V DC power.

[0160] 14 , in some embodiments, the mainboard 11 includes a system on chip (SOC) 111 , a first modem chip 112 , a first operational amplifier 113 , a first power supply circuit 114 , and a first interface component 115 .

[0161] The system chip 111 is configured to obtain coded audio data and decode the coded audio data to obtain audio data of at least one channel.

[0162] The first modem chip 112 is connected to the system chip 111 and is configured to modulate audio data of at least one channel to obtain an analog audio signal.

[0163] The first operational amplifier 113 is connected to the first modulation and demodulation chip 112 and is configured to linearly amplify the analog audio signal and input the linearly amplified analog audio signal into the power adapter 300 .

[0164] The first power circuit 114 is connected to the first operational amplifier 113 and is connected to the power board 12 via the first interface component 115. The first power circuit 114 is configured to use the power rectified by the power board 12 to supply power to the main board 11.

[0165] In this way, the mainboard 11 can output the analog audio signal to the power board 12 through the first interface component 115 .

[0166] In some embodiments, the system chip 111 can output the audio data of at least one channel obtained by decoding through the audio bus built into the integrated circuit. In Figure 14, the system chip 111 outputs the audio data of each channel through I2S1, I2S2, ..., I2Sn as an example.

[0167] In some embodiments, the first modem chip 112 may be a G.hn chip. The first modem chip 112 is further configured to, upon receiving audio data of at least one channel outputted by the system chip 111 via I2S, convert the audio data of at least one channel into a G.hn protocol data format and modulate the data into an analog audio signal in a first frequency band.

[0168] In some embodiments, when the audio data of at least one channel includes audio data of multiple channels, the first modem chip 112 is further configured to modulate the audio data of the multiple channels into analog signals and send them at different times.

[0169] In some embodiments, when the audio data of at least one channel includes audio data of multiple channels, the first modem chip 112 is further configured to modulate the audio data of the multiple channels into analog signals of different frequencies.

[0170] In some embodiments, the first modem chip 112 is further configured to perform orthogonal frequency division multiplexing (OFDM) on the audio data of the at least one channel to obtain an analog differential signal corresponding to the audio data of the at least one channel.

[0171] OFDM is a multi-carrier modulation technology developed from multi-carrier modulation (MCM). OFDM can achieve parallel transmission of high-speed serial data through frequency division multiplexing and has good resistance to multipath fading.

[0172] In some embodiments of the present disclosure, the audio data of each channel is modulated by OFDM technology, so that the parallel transmission of the audio data of each channel is achieved through frequency division multiplexing, so that the synchronous transmission of multi-channel data can be maintained in the time domain, thereby reducing the transmission delay between multiple channels.

[0173] Unlike the conventional approach of using a single signal line and a single ground line, OFDM modulates analog differential signals over differential traces (comprising two signal lines). The two signals transmitted on the two signal lines have the same amplitude but opposite phases. This allows the signal receiver to determine the logic state of the transmitter by comparing the voltage difference between the two signals. On a circuit board, differential traces are two lines of equal length and width, located close together, and on the same plane.

[0174] In some embodiments, the first operational amplifier 113 may linearly amplify the analog audio signal by a factor of 10.

[0175] In some embodiments, the first operational amplifier 113 linearly amplifies the analog audio signal by a factor of 2 to 20. In some embodiments, the amplification factor is 2, 5, 10, 15, or 20.

[0176] In some embodiments, the first interface component 115 includes a 12V DC interface, a GND interface, a TRX+ interface, and a TRX- interface.

[0177] 15 , in some embodiments, the power board 12 includes a first rectifier circuit 121 and a second interface component 122 , and the first rectifier circuit 121 is connected to the second interface component 122 .

[0178] The first rectifier circuit 121 includes a plurality of DCDC chips and is configured to rectify the voltage of the power provided by the power supply circuit to the rated voltage of the mainboard and supply power to the mainboard through the second interface component 122 .

[0179] In some embodiments, the second interface assembly 122 includes a 12V DC interface, a GND interface, a TRX+ interface, and a TRX- interface. Each interface of the second interface assembly 122 is connected to a corresponding interface on the power board via twisted-pair electronic cables. Connecting any interface on the power board 12 to a corresponding interface on the mainboard 11 via twisted-pair electronic cables can eliminate industrial mode interference.

[0180] 16 , in some embodiments, the power adapter 21 includes: a second rectifier circuit 211 , a first coupling circuit 212 , and a third interface component 213 .

[0181] The second rectifier circuit 211 is respectively connected to the power supply circuit 300 and the third interface component 213, and is configured to rectify the voltage of the power provided by the power supply circuit 300 to the rated voltage of the sound board 424, and provide the rectified power to the sound board 424 through the third interface component 213 to power the sound board 424.

[0182] The first coupling circuit 212 is connected to the power supply circuit 300 and the third interface component 213 respectively, and is configured to couple the analog audio signal from the power supply circuit 300, and provide the coupled analog audio signal to the sound board 424 through the third interface component 213, so that the sound board 424 makes sound based on the analog audio signal.

[0183] In some embodiments, the input of the second rectifier circuit 211 (power provided by the power supply circuit) is 220V AC power, and the output of the second rectifier circuit 211 is 19V DC power.

[0184] In some embodiments, the third interface component 213 includes: a 19V DC interface, a GND interface, a TRX+ interface, and a TRX- interface.

[0185] Referring to Figure 17 , in some embodiments, the first coupling circuit 212 includes a first coupling transformer Q1 formed by a first primary coil 51 and a first secondary coil 52, a first filter capacitor C01, and a second filter capacitor C02. The first filter capacitor C01 and the second filter capacitor C02 are respectively disposed at both ends of the first secondary coil 52. The cutoff frequency of the first coupling circuit 212 is greater than the power frequency of the power supply circuit 300 and less than the first frequency band.

[0186] It is understandable that, since the cutoff frequency of the first coupling circuit 212 is greater than the power frequency of the power supply circuit 300 and less than the first frequency band, the first coupling circuit can couple the analog audio signal from the power supply circuit and filter out the power frequency component therein.

[0187] In some embodiments, the power frequency of the power supply circuit 300 is 50 Hz, the first frequency band is [3 MHz, 5.5 MHz], and the cutoff frequency of the first coupling circuit is 60 Hz.

[0188] In some embodiments, the inductance of the first primary coil 51 of the first coupling transformer Q1 is 1.5 mH, and the turns ratio of the first primary coil 51 to the first secondary coil 52 is 1:1.

[0189] In some embodiments, the capacitance of the first filter capacitor C01 and the second filter capacitor C02 is 10 nF, and the rated voltage of the first filter capacitor C01 and the second filter capacitor C02 is 220V.

[0190] Referring to Figure 18, in some embodiments, the sound board 424 includes: a first bandpass filter 221, a second modem chip 222, a power amplifier 223 corresponding to each channel (such as the first power amplifier, the second power amplifier,..., the Nth power amplifier), a plurality of vibrators 220 arranged in the sound board (such as vibrator Z1, vibrator Z2,..., vibrator n), a second power supply circuit 224 and a fourth interface component 225.

[0191] The first bandpass filter 221 is connected to the second modulation and demodulation chip 222 and the fourth interface component 225 respectively, and is configured to filter the analog audio signal coupled by the power adapter 21 .

[0192] The second modem chip 222 is connected to the power amplifier 223 and is configured to demodulate the filtered analog audio signal to obtain audio data of at least one channel.

[0193] The power amplifier 223 corresponding to each channel is configured to amplify the audio data of the corresponding channel and transmit the amplified audio data to the transducer corresponding to each channel.

[0194] The second power supply circuit 224 is connected to the power adapter 21 via the fourth interface component 225 , and is configured to utilize the rectified power from the power adapter 21 to power other components in the sound board 424 .

[0195] In this way, the power adapter 21 can output the coupled analog audio signal to the sound board 424 through the fourth interface component 225 .

[0196] In some embodiments, the sound board 424 includes at least one power amplifier 223, each corresponding to at least one channel. Each of the at least one power amplifier 223 is configured to amplify audio data of the corresponding channel and transmit the amplified audio data to the vibrator corresponding to the corresponding channel.

[0197] 19 , in some embodiments, the first bandpass filter 221 is a third-order bandpass Butterworth filter.

[0198] The third-order bandpass Butterworth filter includes a first resistor R1, a first capacitor C1, and a first inductor L1, wherein the first resistor R1, the first capacitor C1, and the first inductor L1 are sequentially connected in series between a first node T1 and a first input terminal Input1.

[0199] The third-order bandpass Butterworth filter further includes a second resistor R2, a second capacitor C2, and a second inductor L2, wherein the second resistor R2, the second capacitor C2, and the second inductor L2 are sequentially connected in series between the second node T2 and the second input terminal Input2.

[0200] The third-order bandpass Butterworth filter further includes a third capacitor C3 and a third inductor L3. The terminals of the third capacitor C3 are connected to the first node T1 and the second node T2, respectively. The terminals of the third inductor L3 are connected to the first node T1 and the second node T2, respectively. In some embodiments, the third capacitor C3 and the third inductor L3 are arranged in parallel.

[0201] The third-order band-pass Butterworth filter further includes a fourth inductor L4 and a fourth capacitor C4 , and the fourth inductor L4 and the fourth capacitor C4 are sequentially connected in series between the first node T1 and the first output terminal Output1 .

[0202] The third-order band-pass Butterworth filter further includes a fifth inductor L5 and a fifth capacitor C5 , and the fifth inductor L5 and the fifth capacitor C5 are sequentially connected in series between the second node T2 and the second output terminal Output2 .

[0203] In some embodiments, the frequency at the 3 dB bandwidth of the first bandpass filter 221 is 2.5 MHz, and the in-band flatness is 1 dB.

[0204] In some embodiments, the second modem chip 222 may be a G.hn chip. The second modem chip 222 is further configured to, after receiving the analog audio signal coupled by the power adapter 21, demodulate the analog audio signal into at least one channel of audio data in a G.hn protocol data format, perform format conversion on the at least one channel of audio data in the G.hn protocol data format, and input the format-converted audio data of each channel into the power amplifier corresponding to each channel.

[0205] It should be noted that the demodulation method used by the second modem chip 222 to demodulate the analog audio data is the inverse of the modulation method used by the first modem chip 112 to modulate the audio data of at least one channel. In some embodiments, the first modem chip 112 performs OFMD modulation on the audio data of at least one channel, while the second modem chip 222 performs OFMD demodulation on the analog audio data.

[0206] In some embodiments, the second modem chip 222 can output the audio data of at least one channel obtained through demodulation via an integrated circuit's built-in audio bus (Inter-IC Sound, I2S). FIG. 18 illustrates an example in which the second modem chip 222 outputs the audio data of each channel to the power amplifier corresponding to each channel via I2S1, I2S2, ..., I2Sn.

[0207] In some embodiments, the fourth interface assembly 225 includes a 19V DC interface, a GND interface, a TRX+ interface, and a TRX- interface. Each interface of the fourth interface assembly 225 is connected to a corresponding interface of the power adapter 21 via a twisted pair of electronic cables. Connecting any interface of the sound board 424 to the corresponding interface of the power adapter 21 via twisted pair electronic cables can eliminate industrial mode interference.

[0208] It should be noted that the power supply circuit 300 in some embodiments of the present disclosure refers to the circuit that provides power to the laser projection device 40 (including the circuit that provides power to the main unit and screen of the laser projection device 40). The power supply circuit 300 is part of the power system. Generally, the main unit and screen of the laser projection device 40 are powered by the same power system. Therefore, the main unit and screen of the laser projection device 40 can also be understood as being electrically connected through the power system.

[0209] Based on this, in some embodiments of the present disclosure, the laser projection device 40 can transmit signals between the host 41 and the screen 42 via the power supply circuit 300. In addition, because the power supply circuit 300 is a circuit that both the host and the screen of the laser projection device 40 need to be connected to, transmitting signals between the host and the screen of the laser projection device 40 via the power supply circuit does not increase the number of wired or wireless lines between the host and the screen of the laser projection device 40.

[0210] Some embodiments of the present disclosure provide a laser projection device 40 comprising a main unit and a screen. The main unit comprises a main board and a power supply board. The screen comprises a power adapter, a sound board, and a plurality of vibrators disposed within the sound board. The power supply board is connected to a power supply circuit and configured to rectify the power provided by the power supply circuit to power the main unit. The power adapter is connected to the power supply circuit and configured to rectify the power provided by the power supply circuit to power the screen.

[0211] The main board is configured to acquire audio data from at least one channel and modulate the audio data from the at least one channel into an analog audio signal in a first frequency band. The power board is further configured to transmit the analog audio signal to the power supply circuit. The power adapter is further configured to couple the analog audio signal from the power supply circuit. The sound board is configured to demodulate the analog audio signal coupled from the power adapter to acquire audio data from the at least one channel, and drive at least one of the plurality of vibrators to produce sound based on the audio data from the at least one channel.

[0212] It can be understood that since the transmission paths of the audio data of each channel of the laser projection device 40 provided in some embodiments of the present disclosure are, in sequence, the main board, the power board, the power line, the power adapter, the sound board, and the multiple vibrators arranged in the sound board, some embodiments of the present disclosure can realize the transmission of audio data of each channel between the host and the screen through the power supply circuit, thereby avoiding connecting an audio cable between the host and the screen, or deploying a wireless transceiver module in the host and the screen.

[0213] In some embodiments, the sound board 424 is further configured to obtain control information and modulate the control information into an analog control signal in a second frequency band. The power adapter 21 is further configured to transmit the analog control signal to the power supply circuit 300. The power board 12 is further configured to couple the analog control signal from the power supply circuit 300. The main board 11 is further configured to demodulate the analog control signal coupled by the power board 12 to obtain control information and perform sound control based on the control information.

[0214] In some embodiments, the control information may include the amount of channel data supported by the sound board 424, audio data reception confirmation information (ACK information), etc.

[0215] When the control information includes the number of channels supported by the sound board, as shown in FIG. 20 , based on the sound board 424 shown in FIG. 18 , the sound board 424 further includes: a current detection amplifier 226 and a second operational amplifier 227 .

[0216] The sound board 424 is also configured to detect the current of the power amplifier 223 corresponding to each channel of the sound board 424 through the current detection amplifier 226, determine the number of channels supported by the sound board 424 based on the current of the power amplifier 223 corresponding to each channel, and linearly amplify the analog control signal through the second operational amplifier 226.

[0217] In some embodiments, the sound board 424 is configured to detect the current of the power amplifier 223 corresponding to each channel through the current detection amplifier 226, determine the number of channels supported by the sound board 424 based on the current of the power amplifier 223 corresponding to each channel, modulate the number of channels into an analog control signal of the second frequency band through the second modulation and demodulation chip 222, amplify the analog control signal through the second operational amplifier 226, and output the amplified analog control signal to the power adapter 21 through the fourth interface component 225.

[0218] It can be understood that in some embodiments of the present disclosure, the current of the power amplifier corresponding to each channel of the sound board 424 is detected by the current detection amplifier 226, and the number of channels supported by the sound board 424 is determined according to the current of the power amplifier 223 corresponding to each channel, and the number of channels supported by the sound board is output to the main board 11 through the power adapter 21, the power supply circuit 300, and the power board 12, so as to facilitate the use of the sound board with screens that support different numbers of channels, and avoid the channel data output by the main board from being inconsistent with the channels supported by the sound board.

[0219] In some embodiments, the second frequency band is [3 MHz, 5.5 MHz]. In some embodiments, the second frequency band is the same as the first frequency band.

[0220] In some embodiments, the amplification factor of the second operational amplifier 227 is 10 times.

[0221] In some embodiments, the second operational amplifier 227 amplifies the analog control signal by a factor of 2 to 20. In some embodiments, the amplification factor is 2, 5, 10, 15, or 20.

[0222] Referring to Figure 21 , in addition to the power supply board 12 shown in Figure 15 , the power supply board 12 further includes a second coupling circuit 123. The second coupling circuit 123 is connected to the power supply circuit 300 and the second interface component 122, respectively. The second coupling circuit 123 is arranged in parallel with the first rectifier circuit 121. The power supply board 12 is further configured to couple an analog control signal from the power supply circuit 300 via the second coupling circuit 123.

[0223] 22 , the second coupling circuit 123 includes a second coupling transformer Q2 , a third filter capacitor C03 , and a fourth filter capacitor C04 . The second coupling transformer Q2 includes a second primary coil 101 and a second secondary coil 102 .

[0224] The third filter capacitor C03 and the fourth filter capacitor C04 are respectively disposed at both ends of the second secondary coil 102 . The cutoff frequency of the second coupling circuit Q2 is greater than the power frequency of the power supply circuit 300 and less than the second frequency band.

[0225] In some embodiments, the cutoff frequency of the second coupling circuit Q2 is 60 Hz.

[0226] In some embodiments, the inductance of the second primary coil 101 of the second coupling transformer Q2 is 1.5 mH, and the turns ratio of the second primary coil 101 to the second secondary coil 102 is 1:1.

[0227] In some embodiments, the capacitance of the third filter capacitor C03 and the fourth filter capacitor C04 is 10 nF, and the rated voltage of the third filter capacitor C03 and the fourth filter capacitor C04 is 220V.

[0228] Referring to FIG. 23 , in addition to the mainboard 11 shown in FIG. 14 , the mainboard 11 further includes a second bandpass filter 116. The second bandpass filter 116 is connected to the first modulation and demodulation chip 112 and the first interface component 115, respectively, and is arranged in parallel with the first operational amplifier 113. The mainboard 11 is further configured to filter the analog control signal coupled from the power board 12 through the second bandpass filter 116 before demodulating the analog control signal.

[0229] In some embodiments, the second bandpass filter 116 may be a third-order bandpass Butterworth filter. The structure of the third-order bandpass Butterworth filter may refer to some of the aforementioned embodiments and FIG.

[0230] It can be understood that before demodulating the analog control signal coupled to the power board 12, filtering the analog control signal through the second bandpass filter 116 can filter out the noise in the analog control signal, thereby helping to improve the accuracy of demodulating the control signal by the first modulation and demodulation chip.

[0231] In some embodiments, the second modem chip 222 may perform OFMD modulation on the control signal to obtain an analog differential signal corresponding to the control information, and the first modem chip 112 may perform OFMD demodulation on the analog differential signal corresponding to the control information to obtain the control information.

[0232] Some embodiments of the present disclosure further provide a sound emitting method of a laser projection device 40 . As shown in FIG. 12 and FIG. 13 , the laser projection device 40 includes a host 41 and a screen 42 .

[0233] The main unit 41 includes a mainboard 11 and a power board 12. The screen 42 includes a power adapter 21, a sound board 424, and multiple vibrators 220 disposed within the sound board 424. The power board 12 is connected to the power supply circuit 300 and is configured to rectify the power provided by the power supply circuit 300 to power the main unit 41. The power adapter 21 is connected to the power supply circuit 300 and is configured to rectify the power provided by the power supply circuit 300 to power the screen 42.

[0234] 24 , some embodiments of the present disclosure provide a sound emitting method for a laser projection device 40 including steps S121 to S124 .

[0235] In step S121, audio data of at least one channel is acquired through the mainboard, and the audio data of at least one channel is modulated into an analog audio signal of a first frequency band.

[0236] In some embodiments, modulating the audio data of at least one channel into an analog audio signal in a first frequency band includes: modulating the audio data of at least one channel into an analog differential signal based on OFMD technology.

[0237] In step S122, the analog audio signal is sent to the power supply circuit via the power board.

[0238] In some embodiments, the analog audio signal obtained by modulating the audio data of at least one channel by the mainboard is applied to the power supply circuit 300 for transmission.

[0239] In step S123, an analog audio signal is coupled from the power supply circuit via the power adapter.

[0240] It should be noted that, since the power supply circuit 300 also transmits industrial frequency power, the first coupling circuit needs to filter out the industrial frequency component in the power supply circuit when coupling the analog audio signal.

[0241] In step S124, the analog audio signal coupled by the power adapter is demodulated through the power adapter to obtain audio data of at least one channel, and at least one vibrator among the multiple vibrators is driven to produce sound based on the audio data of the at least one channel.

[0242] It can be understood that the sound generation method of the laser projection device provided in some embodiments of the present disclosure can achieve the technical effect of the laser projection device as described in any of the above embodiments, which will not be elaborated here.

[0243] In some embodiments, the sound generation method of the laser projection device 40 further includes: filtering the analog audio signal through the mainboard before sending the analog audio signal to the power supply circuit through the power board.

[0244] In some embodiments, the sound generation method of the laser projection device 40 further includes: filtering the analog audio signal coupled by the power adapter through the sound generation board before demodulating the analog audio signal coupled by the power adapter through the power adapter to obtain audio data of at least one channel.

[0245] In some embodiments, the sound-generating method of the laser projection device 40 also includes: obtaining control information through a sound-generating board, and modulating the control information into an analog control signal of a second frequency band; sending the analog control signal to the power supply circuit through a power adapter; coupling the analog control signal from the power supply circuit through the power board; obtaining control information by demodulating the analog control signal coupled by the power board, and performing sound control based on the control information.

[0246] In some embodiments, the control information includes the number of channels supported by the soundboard.

[0247] In some embodiments, the sound generation method of the laser projection device 40 further includes: amplifying the analog control signal before sending the analog control signal to the power supply circuit through the power adapter.

[0248] In some embodiments, the sound generation method of the laser projection device 40 further includes: demodulating the analog control signal coupled to the power board to obtain the control information, and then filtering the analog control signal.

[0249] Some embodiments of the present disclosure also provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium), on which a computer program is stored. When the computer program is executed by a processor, the various steps of the sound emission method of the laser projection device 40 described in any of the above embodiments can be implemented, and the same technical effect can be achieved.

[0250] The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0251] The present disclosure provides a computer program product, which includes a computer program. When the computer program is run on a computer, the computer implements the sound emission method of the laser projection device 40 described in any of the above embodiments and can achieve the same technical effect.

[0252] It should be noted that, in some embodiments, the laser projection devices 40 in any two or more of the above embodiments may be combined to achieve the technical effects achieved by multiple embodiments.

[0253] In some embodiments, the laser projection device shown in Figures 12 to 23 can be applied to the laser projection device shown in Figures 1 to 8. In this way, in the laser projection device shown in Figures 1 to 8, the host 41 and the screen 42 can realize the transmission of audio data of each channel through the power supply circuit, so that the first wireless communication component, the second wireless communication component and the third wireless communication component can be omitted, further reducing the manufacturing process difficulty and manufacturing cost of the laser projection device 40.

[0254] It should be noted that any one of the technical solutions disclosed in the present disclosure can, to a certain extent, solve one or more of the above-mentioned technical problems and achieve certain disclosure purposes; multiple technical disclosures can also be combined into an overall solution to solve one or more of the above-mentioned technical problems and achieve certain disclosure purposes; some of the technical disclosures can also be selected to be combined into an overall solution, while adopting related technologies and inferior solutions, but the inferior trend can be compensated by the means disclosed in this technology, and the above-mentioned one or more technical problems can be solved to a certain extent as a whole and certain disclosure purposes can be achieved; each technical disclosure combined into a complete technical solution constitutes an organic and inseparable overall solution, which solves technical problems as a whole and achieves certain disclosure purposes.

[0255] Any technical disclosure in this disclosure, as well as the recombination of multiple technical disclosures, can form a complete technical solution and can solve one or more of the above-mentioned technical problems and achieve the purpose of disclosure. They all belong to the content of this disclosure and are the content that is directly and unambiguously determined based on the content of this disclosure.

[0256] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A laser projection device, comprising: A main chip is configured to output a first audio signal and a first control signal in a first sound emission mode, and to output a second audio signal and a second control signal in a second sound emission mode; A first wireless communication component is configured to input one of the first audio signal and the second audio signal output by the main chip into a first audio signal processing circuit; a second wireless communication component, configured to input one of the first control signal and the second control signal output by the main chip into the first audio signal processing circuit; Sounding board; A plurality of vibrators to be selected are arranged in the sounding board and distributed at different positions of the sounding board; and The first audio signal processing circuit is configured to: under the control of the first control signal, output the first audio signal through the target vibrator among the multiple vibrators to be selected, or, under the control of the second control signal, output the second audio signal through the first vibrator to be selected and the second vibrator to be selected among the multiple vibrators to be selected.

2. The laser projection device according to claim 1, wherein: The main chip is also configured as: When the sound emission mode of the laser projection device is the first sound emission mode, acquiring a video image frame displayed by the laser projection device; According to the distribution positions of the multiple vibrators to be selected in the sounding board, the video image frame is divided into a plurality of image blocks; When the facial features of the organism are recognized from the target image block among the plurality of image blocks, intercepting the facial image of the organism in the target image block; When it is determined that the corresponding organism in the facial image of the organism has a vocalization action by identifying the key points of the mouth in the facial image of the organism, the candidate vibrator corresponding to the target image block is determined as the target vibrator.

3. The laser projection device according to claim 1 or 2, wherein: The first audio signal processing circuit comprises: a first power amplifier configured to: under the control of the first control signal, based on a first audio processing parameter, amplify the first audio signal to obtain a first audio signal to be output; and The first analog switch is configured to: under the control of the first control signal, input the first audio signal to be output into the target vibrator, so as to output the first audio signal to be output through the target vibrator.

4. The laser projection device according to claim 3, wherein: The first power amplifier is further configured to: under the control of the second control signal, amplify the second audio signal based on the second audio processing parameter to obtain a second audio signal to be output; The first audio signal processing circuit also includes a second analog switch; the second analog switch is configured to: under the control of the second control signal, input the second audio signal to be output into the first vibrator to be selected and the second vibrator to be selected, so as to output the second audio signal to be output through the first vibrator to be selected and the second vibrator to be selected.

5. The laser projection device according to any one of claims 1 to 4, wherein: The main chip is further configured to output a third audio signal and a fourth audio signal; The laser projection device also includes: A left surround vibrator, a right surround vibrator, a left rear surround vibrator and a right rear surround vibrator arranged in the sound-emitting panel; A third wireless communication component is configured to: input the third audio signal and the fourth audio signal into a second audio signal processing circuit; The second audio signal processing circuit is configured to: output the third audio signal through the left surround vibrator and the right surround vibrator, and output the fourth audio signal through the left rear surround vibrator and the right rear surround vibrator.

6. The laser projection device according to claim 5, wherein: The second audio signal processing circuit comprises: a second power amplifier configured to amplify the third audio signal to obtain a third audio signal to be played, and input the third audio signal to be output into the left surround vibrator and the right surround vibrator to output the third audio signal to be output through the left surround vibrator and the right surround vibrator; and The third power amplifier is configured to amplify the fourth audio signal to obtain a fourth audio signal to be played, and to input the fourth audio signal to be output into the left rear surround vibrator and the right rear surround vibrator to output the fourth audio signal to be output through the left rear surround vibrator and the right rear surround vibrator.

7. The laser projection device according to claim 5, wherein: The main chip includes: A first audio bus interface, through which the main chip is connected to a wireless transmitter of the first wireless communication component; A bidirectional two-wire synchronous serial bus interface and a universal serial bus interface, wherein the main chip is connected to the second wireless communication component via one of the bidirectional two-wire synchronous serial bus interface and the universal serial bus interface; A second audio bus interface and a third audio bus interface, wherein the main chip is connected to the wireless transmitting end of the third wireless communication component through the second audio bus interface and the third audio bus interface; Wherein, the main chip is further configured as: Sending one of the first audio signal and the second audio signal to a wireless transmitter of the first wireless communication component through the first audio bus interface; Sending one of the first control signal and the second control signal to a wireless transmitting end of the second wireless communication component through one of the bidirectional two-wire synchronous serial bus interface and the universal serial bus interface; and The third audio signal is sent to the wireless transmitting end of the third wireless communication component through the second audio bus interface, and the fourth audio signal is sent to the wireless transmitting end of the third wireless communication component through the third audio bus interface.

8. The laser projection device according to any one of claims 1 to 7, wherein: The sounding board comprises: First skin layer; A first adhesive film layer, located on one side of the first skin layer; A honeycomb core layer, located on a side of the first adhesive film layer away from the first skin layer; A second adhesive film layer is located on a side of the honeycomb core layer away from the first adhesive film layer; and A second skin layer is located on a side of the second adhesive film layer away from the honeycomb core layer; Wherein, the plurality of vibrators to be selected are mounted on a side of the first skin layer away from the first adhesive film layer.

9. The laser projection device according to claim 8, wherein: The sounding board satisfies at least one of the following: The thickness of the first skin layer and the second skin layer is 0.12 mm; The thickness of the honeycomb core layer is 0.03 mm; or, The thickness of the sounding plate is less than or equal to 8 mm.

10. The laser projection device according to any one of claims 1 to 9, wherein: The plurality of vibrators to be selected include nine vibrators to be selected, and the nine vibrators to be selected are distributed in the sound-generating plate in the form of a 3×3 array.

11. A laser projection device, wherein: include: Host, including: a mainboard configured to acquire audio data of at least one channel and modulate the audio data of the at least one channel into an analog audio signal of a first frequency band; and a power board configured to be connected to a power supply circuit and to rectify power provided by the power supply circuit to supply power to the host; and Screen, including A power adapter is configured to be connected to the power supply circuit and to rectify the power provided by the power supply circuit to power the screen; Sounding board; and A plurality of vibrators are arranged in the sound-generating plate; Wherein, the power board is further configured to: send the analog audio signal to the power supply circuit; The power adapter is further configured to: couple the analog audio signal from the power supply circuit; The sounding board is configured as: Demodulating the analog audio signal coupled by the power adapter to obtain audio data of the at least one channel; and At least one of the plurality of transducers is driven to produce sound based on the audio data of the at least one channel.

12. The laser projection device according to claim 11, wherein: The main board comprises: A system chip configured to obtain audio encoding data and decode the audio encoding data to obtain audio data of the at least one channel; A first modem chip is configured to modulate the audio data of the at least one channel to obtain the analog audio signal; The first operational amplifier is configured to linearly amplify the analog audio signal and input the linearly amplified analog audio signal into the power adapter.

13. The laser projection device according to claim 12, wherein: The first modem chip is further configured to perform orthogonal frequency division multiplexing modulation on the audio data of the at least one channel to obtain an analog differential signal corresponding to the audio data of the at least one channel.

14. The laser projection device according to any one of claims 11 to 13, wherein: The power adapter includes a first coupling circuit; the power adapter is further configured to: couple the analog audio signal from the power supply circuit through the first coupling circuit; The first coupling circuit comprises: A first coupling transformer including a first primary coil and a first secondary coil; a first filter capacitor; and A second filter capacitor; the first filter capacitor and the second filter capacitor are respectively arranged at two ends of the first secondary coil; Wherein, the cut-off frequency of the first coupling circuit is greater than the power frequency of the power supply circuit and less than the first frequency band.

15. The laser projection device according to any one of claims 11 to 14, wherein: The sounding board comprises: A first bandpass filter is configured to filter the analog audio signal coupled by the power adapter; A second modulation and demodulation chip is configured to demodulate the analog audio signal after filtering to obtain audio data of the at least one channel; At least one power amplifier corresponds to the at least one channel; any one of the at least one power amplifier is configured to: amplify the audio data of the corresponding channel, and transmit the amplified audio data to the vibrator corresponding to the corresponding channel.

16. The laser projection device according to any one of claims 11 to 15, wherein: The sound board is further configured to: obtain control information, and modulate the control information into an analog control signal of a second frequency band; The power adapter is further configured to: send the analog control signal to the power supply circuit; The power board is further configured to: couple the analog control signal from the power supply circuit; The main board is further configured to: demodulate the analog control signal coupled to the power board to obtain the control information, and perform sound control based on the control information.

17. The laser projection device according to claim 16, wherein: The control information includes: the number of channels supported by the sound board; the sound board also includes a current detection amplifier and a second operational amplifier; The sounding board is also configured as: Detecting the current of at least one power amplifier corresponding to the at least one channel by the current detection amplifier; Determining the number of channels supported by the sound board according to the current of the at least one power amplifier; and The analog control signal is linearly amplified by the second operational amplifier.

18. The laser projection device according to claim 16 or 17, wherein: The power board includes a second coupling circuit; the power board is further configured to: couple the analog control signal from the power supply circuit through the second coupling circuit; The second coupling circuit comprises: A second coupling transformer including a second primary coil and a second secondary coil; A third filter capacitor; and A fourth filter capacitor, wherein the third filter capacitor and the fourth filter capacitor are respectively arranged at two ends of the second secondary coil; Wherein, the cut-off frequency of the second coupling circuit is greater than the power frequency of the power supply circuit and less than the second frequency band.

19. The laser projection device according to any one of claims 16 to 18, wherein: The main board also includes a second bandpass filter; The main board is further configured to filter the analog control signal through the second bandpass filter before demodulating the analog control signal coupled to the power board.

20. A method for producing sound by a laser projection device, wherein: The laser projection device comprises: a main chip, a first wireless communication component, a second wireless communication component, a first audio signal processing circuit, a plurality of vibrators to be selected and a sounding board; the plurality of vibrators to be selected are distributed at different positions in the sounding board; The method comprises: When the sound emission mode of the laser projection device is the first sound emission mode, a first audio signal and a first control signal are output through the main chip, the first audio signal is input into the first audio signal processing circuit through the first wireless communication component, and the first control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the first audio signal through a target vibrator among the multiple vibrators to be selected under the control of the first control signal; and When the sound emission mode of the laser projection device is the second sound emission mode, a second audio signal and a second control signal are output through the main chip, the second audio signal is input into the first audio signal processing circuit through the second wireless communication component, and the second control signal is input into the first audio signal processing circuit through the second wireless communication component, so that the first audio signal processing circuit outputs the second audio signal through the first to be selected vibrator and the second to be selected vibrator among the multiple to be selected vibrators under the control of the second control signal.

21. A method for producing sound by a laser projection device, wherein: The laser projection device comprises: a host and a screen; the host comprises: a main board and a power board; the screen comprises: a power adapter, a sound board and a plurality of vibrators arranged in the sound board; the power board is connected to a power supply circuit and is configured to rectify the power provided by the power supply circuit to power the host; the power adapter is connected to the power supply circuit and is configured to rectify the power provided by the power supply circuit to power the screen; The method comprises: Acquire audio data of at least one channel through the mainboard, and modulate the audio data of the at least one channel into an analog audio signal of a first frequency band; sending the analog audio signal to the power supply circuit via the power board; coupling the analog audio signal from the power supply circuit via the power adapter; and The analog audio signal coupled by the power adapter is demodulated through the power adapter to obtain audio data of the at least one channel, and at least one vibrator among the multiple vibrators is driven to produce sound based on the audio data of the at least one channel.

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