Sound reconstruction device and digital loudspeaker

Abstract

The utility model discloses a sound reconstruction device and a digital loudspeaker. According to the sound reconstruction device, an audio input module is connected with a first end of a control module; the second end of the control module is connected with the first end of the controlled switch module, and the control module is used for converting the received analog audio signal into a digital audio signal and transmitting the digital audio signal to the controlled switch module; the second end of the controlled switch module is connected with the carrier output module, the third end of the controlled switch module is connected with the first end of the driving module, the second end of the driving module is connected with the digital loudspeaker array, and the controlled switch module is used for controlling connection and disconnection between the carrier output module and the driving module based on digital audio signals; the carrier output module is used for sending a carrier signal to the controlled switch module; and the driving module is used for controlling the digital loudspeaker array to work based on the carrier signal. According to the utility model, sound reconstruction of the digital loudspeaker array is realized on the hardware level.

Description

TECHNICAL FIELD

[0001] The utility model relates to sound reconstruction technical field especially relates to a sound reconstruction device and digital loudspeaker. BACKGROUND

[0002] Because the performance of the traditional analog loudspeaker is limited by many factors, such as frequency response and linearity, one solution is to replace it with a digital loudspeaker array. This array can be made of several loudspeakers (i.e. array elements) integrated by micro-machining technology. When the array is used to output an acoustic signal, each array element contributes to a part of the total acoustic signal output, thus improving the overall dynamic characteristics.

[0003] In the prior art, it is possible to integrate hundreds to thousands of loudspeaker arrays on a single chip, but it is difficult to realize sound reconstruction of the digital loudspeaker array. SUMMARY

[0004] The utility model provides a kind of sound reconstruction device and digital loudspeaker, to realize the sound reconstruction of digital loudspeaker array on hardware level.

[0005] According to an aspect of the utility model, a sound reconstruction device is provided, which includes:

[0006] An audio input module, a control module, a carrier output module, a controlled switch module and a driving module;

[0007] The audio input module is connected to the first end of the control module, and the audio input module is used to transmit the analog audio signal to be output to the control module;

[0008] The second end of the control module is connected to the first end of the controlled switch module, and the control module is used to convert the received analog audio signal into a digital control signal corresponding to the analog audio signal, and transmit the digital control signal to the controlled switch module;

[0009] The second end of the controlled switch module is connected to the carrier output module, the third end of the controlled switch module is connected to the first end of the driving module, the second end of the driving module is connected to the digital loudspeaker array, and the controlled switch module is used to control the on-off between the carrier output module and the driving module based on the digital audio signal;

[0010] The carrier output module is used to generate a carrier signal and send the carrier signal to the controlled switch module; the driving module is used to drive the digital loudspeaker array to work based on the carrier signal.

[0011] Further, the controlled switch module includes a plurality of controlled switches.

[0012] The second end of the control module includes a plurality of connection ports, the connection ports are arranged and connected one by one with the controlled switches; the carrier output module includes a plurality of carrier output ports, the carrier output ports are arranged and connected one by one with the controlled switches; and the drive module includes a plurality of drive receiving ports, the drive receiving ports are arranged and connected one by one with the controlled switches.

[0013] Further, the control module includes:

[0014] The first multiplexer, the second multiplexer, the third multiplexer, the comparison unit, the subtractor, the register, the demultiplexer, the threshold calculation unit, the voltage holding unit and the enable output unit;

[0015] The audio input module is connected with the first input end of the first multiplexer, the output end of the register is connected with the second input end of the first multiplexer, the output end of the first multiplexer is connected with the first input end of the comparison unit, the output end of the second multiplexer is connected with the second input end of the comparison unit, the output end of the comparison unit is connected with the first input end of the demultiplexer, and the output end of the demultiplexer is connected with the controlled switch module;

[0016] The threshold calculation unit is connected with the first input end of the second multiplexer, the output end of the second multiplexer is connected with the second end of the subtractor, the output end of the first multiplexer is connected with the second end of the subtractor and the first input end of the third multiplexer respectively, the output end of the subtractor is connected with the second input end of the third multiplexer, the output end of the comparison unit is connected with the enable end of the third multiplexer, and the output end of the third multiplexer is connected with the input end of the register through the voltage holding unit;

[0017] The first output end of the enable output module is connected with the enable end of the first multiplexer, the second output end of the enable output module is connected with the enable end of the second multiplexer, and the third output end of the enable output module is connected with the enable end of the demultiplexer, and the enable output module is used for outputting a first enable signal to the first multiplexer and outputting a second enable signal to the second multiplexer and the demultiplexer.

[0018] Further, the sound reconstruction device further includes:

[0019] The delay module includes a first delay unit, a second delay unit, a third delay unit and a fourth delay unit;

[0020] The first delay unit is arranged at the third multiplexer and connected with the first input end of the third multiplexer, the second delay unit is arranged at the third multiplexer and connected with the second input end of the third multiplexer, the third delay unit is arranged at the third multiplexer and connected with the output end of the third multiplexer, and the fourth delay unit is arranged at the third multiplexer and connected with the enable end of the third multiplexer.

[0021] Further, the sound reconstruction device further includes:

[0022] Clamping module;

[0023] The clamping module is connected to the second end of the driver module.

[0024] Furthermore, the sound reconstruction device also includes:

[0025] Amplification module;

[0026] The first end of the amplification module is connected to the third end of the controlled switch module, and the second end of the amplification module is connected to the first end of the drive module.

[0027] Furthermore, if the carrier signal includes a sine wave or a triangular wave, the controlled switch includes an analog switching device; if the carrier signal includes a square wave, the controlled switch includes an analog switching device or a logic gate device.

[0028] Furthermore, the comparison unit includes a comparator or a Schmitt latch.

[0029] Furthermore, if the carrier signal includes a sine wave or a triangular wave, the drive module includes an analog audio amplifier; if the carrier signal includes a square wave, the drive module includes an analog audio amplifier or a MOSFET driver.

[0030] According to another aspect of the present invention, a digital loudspeaker is provided, comprising: a digital loudspeaker array and any of the sound reconstruction devices described in the above embodiments;

[0031] The sound reconstruction device is connected to a digital speaker array.

[0032] The sound reconstruction device provided in this embodiment includes an audio input module, a control module, a carrier output module, a controlled switch module, and a drive module. By connecting the audio input module to the first end of the control module, the second end of the control module to the first end of the controlled switch module, the second end of the controlled switch module to the carrier output module, the third end of the controlled switch module to the first end of the drive module, and the second end of the drive module to the digital speaker array, sound reconstruction of the digital speaker array is realized at the hardware level.

[0033] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a sound reconstruction device according to an embodiment of the present utility model;

[0036] Figure 2 This is a schematic diagram of another sound reconstruction device provided according to an embodiment of the present utility model;

[0037] Figure 3 This is a partial structural schematic diagram of a sound reconstruction device according to an embodiment of the present utility model;

[0038] Figure 4 This is a schematic diagram of the signal output of the first enable signal at the k-th sampling time according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the signal output of the second enable signal at the k-th sampling time according to an embodiment of the present invention;

[0040] Figure 6 This is a partial structural schematic diagram of a sound reconstruction device according to an embodiment of the present utility model;

[0041] Figure 7 This is a structural schematic diagram of another sound reconstruction device provided according to an embodiment of the present utility model;

[0042] Figure 8 This is a structural schematic diagram of another sound reconstruction device provided according to an embodiment of the present utility model. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] This utility model provides a sound reconstruction device. Figure 1 This is a structural schematic diagram of a sound reconstruction device according to an embodiment of the present invention, with reference to... Figure 1 The sound reconstruction device includes:

[0046] Audio input module 1, control module 2, carrier output module 3, controlled switch module 4, and drive module 5;

[0047] The audio input module 1 is connected to the first end of the control module 2. The audio input module 1 is used to transmit the analog audio signal to be output to the control module 2.

[0048] The second end of the control module 2 is connected to the first end of the controlled switch module 4. The control module 2 is used to convert the received analog audio signal into a digital control signal corresponding to the analog audio signal and transmit the digital control signal to the controlled switch module 4.

[0049] The second end of the controlled switch module 4 is connected to the carrier output module 3, the third end of the controlled switch module 4 is connected to the first end of the drive module 5, and the second end of the drive module 5 is connected to the digital speaker array 6. The controlled switch module 4 is used to control the on / off state between the carrier output module 3 and the drive module 5 based on the digital audio signal.

[0050] The carrier output module 3 is used to generate a carrier signal and send the carrier signal to the controlled switch module 4; the drive module 5 is used to drive the digital speaker array 6 to work based on the carrier signal.

[0051] The number of speaker elements in the digital speaker array 6 can be set according to actual needs. For example, if the number of speaker elements in the digital speaker array 6 is 2... n -1, where n is an integer greater than 0. Therefore, the number of speaker elements in this digital speaker array 6 can be represented by an n-bit binary number. At this point, the total number of elements in the digital speaker array 6 corresponding to the i-th bit is 2.i-1 A non-repeating count of speaker elements. For example, a digital speaker array with 15 elements can be divided into 4 groups (n=4) with no extra elements remaining, wherein the number of elements in each group is as follows: the first bit group contains 1 speaker, the second bit group contains 2 speakers, the third bit group contains 4 speakers, and the fourth bit group contains 8 speakers.

[0052] Specifically, after receiving the analog audio signal output from the audio input module 1, the control module 2 discretizes the received analog audio signal, converting it into a digital audio signal. This digital audio signal comprises n digital audio sub-signals, the number of which is the same as the number of bit groups in the digital speaker array. After converting the analog audio signal into a digital audio signal, the control module 2 transmits the digital audio signal to the controlled switch module 4. The controlled switch module 4 controls the connection and disconnection of the signal link from the carrier output module 3 to the drive module 5 based on the received digital audio signal, thereby achieving the reconstruction of the analog audio signal. The effective level of the controlled switch module 4 is consistent with the effective level of the control module 2; for example, both the effective levels of the controlled switch module 4 and the control module 2 can be high or low. The carrier signal output by the carrier output module 3 can be a 45kHz sine wave.

[0053] The sound reconstruction device provided in this embodiment includes an audio input module 1, a control module 2, a carrier output module 3, a controlled switch module 4, and a drive module 5. By connecting the audio input module 1 to the first end of the control module 2, the second end of the control module 2 to the first end of the controlled switch module 4, the second end of the controlled switch module 4 to the carrier output module 3, the third end of the controlled switch module 4 to the first end of the drive module 5, and the second end of the drive module 5 to the digital speaker array 6, the sound reconstruction of the digital speaker array 6 is realized at the hardware level.

[0054] Furthermore, Figure 2 This is a schematic diagram of another sound reconstruction device provided according to an embodiment of the present invention, with reference to... Figure 2 The controlled switch module includes multiple controlled switches 41;

[0055] The second end of the control module 2 includes multiple connection ports, which are configured and connected to the controlled switch 41 in a one-to-one correspondence; the carrier output module 3 includes multiple carrier output ports, which are configured and connected to the controlled switch 41 in a one-to-one correspondence; the drive module 5 includes multiple drive receiving ports, which are configured and connected to the controlled switch 41 in a one-to-one correspondence.

[0056] The number of connection ports, the number of carrier output ports, and the number of drive receiving ports are the same as the number of bit groups in the digital speaker array.

[0057] Specifically, after the control module 2 converts the analog audio signal into multiple digital audio sub-signals, it transmits each digital audio sub-signal to its corresponding controlled switch 41 through different connection ports. Each controlled switch 41 controls the connection and disconnection between different carrier output ports in the carrier output module 3 and different drive receiving ports in the drive module 5 according to the received digital audio sub-signals, thereby enabling different bit groups in the digital speaker array 6 to be controlled simultaneously to achieve the reconstruction of the analog audio signal.

[0058] Furthermore, Figure 3 This is a partial structural schematic diagram of a sound reconstruction device according to an embodiment of the present invention, with reference to... Figure 3 The control module includes:

[0059] First multiplexer 21, second multiplexer 22, third multiplexer 23, comparison unit 24, subtractor 25, register 26, demultiplexer 27, threshold calculation unit 28, voltage holding unit 30, and enable output unit 29;

[0060] The audio input module 1 is connected to the first input terminal of the first multiplexer 21, the output terminal of the register 26 is connected to the second input terminal of the first multiplexer 21, the output terminal of the first multiplexer 21 is connected to the first input terminal of the comparison unit 24, the output terminal of the second multiplexer 22 is connected to the second input terminal of the comparison unit 24, the output terminal of the comparison unit 24 is connected to the first input terminal of the demultiplexer 27, and the output terminal of the demultiplexer 27 is connected to the controlled switch module 4 through the voltage holding unit 30.

[0061] The threshold calculation unit 28 is connected to the first input terminal of the second multiplexer 22, the output terminal of the second multiplexer 22 is connected to the second terminal of the subtractor 25, the output terminal of the first multiplexer 21 is connected to the second terminal of the subtractor 25 and the first input terminal of the third multiplexer 23 respectively, the output terminal of the subtractor 25 is connected to the second input terminal of the third multiplexer 23, the output terminal of the comparison unit 24 is connected to the enable terminal of the third multiplexer 23, and the output terminal of the third multiplexer 23 is connected to the input terminal of the register 26.

[0062] The first output terminal of the enable output module 29 is connected to the enable terminal of the first multiplexer 21, the second output terminal of the enable output module 29 is connected to the enable terminal of the second multiplexer 22, and the third output terminal of the enable output module 29 is connected to the enable terminal of the demultiplexer 27. The enable output module 29 is used to output a first enable signal S0 to the first multiplexer 21 and a second enable signal S1 to the second multiplexer 22 and the demultiplexer 27.

[0063] Specifically, since the control module needs to break down the analog audio signal into multiple input signals for processing, if the time required for the control module to process a certain input signal in the analog audio signal is T, such as... Figure 3 The time-division multiplexing-based hardware design shown requires further subdividing each period T into n time slots T0, i.e., T0 = T / n, with each time slot T0 capable of outputting a digital control sub-signal. Simultaneously, the threshold calculation unit 28 is used to calculate V... i,th =(V max -V min )·2 i-1-n +V min The system calculates n voltage comparison thresholds and transmits them to the second multiplexer 22 for use in calculating digital control sub-signals, where i is an integer greater than 0 and less than or equal to n, and V... max V is the maximum analog voltage in an analog audio signal. min This represents the minimum analog voltage in the analog audio signal. For the k-th sampling time t = t_k... k At that time, the voltage value corresponding to the analog audio signal output by audio input module 1 is It can be converted into a digital control sub-signal compatible with a digital speaker array through the following steps. The specific description is as follows:

[0064] Figure 4 This is a schematic diagram of the signal output of the first enable signal at the k-th sampling time according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the signal output of the second enable signal at the k-th sampling time according to an embodiment of the present invention, as shown below. Figure 4 and Figure 5 As shown, at t=t k At this time, set S0 = 1 and S1 = n. The input signal... The threshold V will be compared with the nth voltage. n,th The comparison is performed, and the comparison result is output to the controlled switch module 4 via the voltage holding unit 30 through the multiplexer 27. The comparison result is also used as the selection signal S2 of the third multiplexer 23. For example, when hour, The signal will be set to a high level, passed through the voltage holding unit 30 via the demultiplexer 27, and output to the controlled switch module 4. The selection signal S2 = 1 will also be output to the third multiplexer 23. Since S2 = 1, the input signal... Compare with the threshold V of the nth voltage n,th The difference is stored in register 26, which is... Stored in a register. hour, The signal will be set to low level, and output to the controlled switch module 4 via the voltage holding unit 30 through the demultiplexer 27. The selection signal S2 = 0 will also be output to the third multiplexer 23. Since S2 = 0, the input signal... Stored in register 26. At this point, the driving voltage for the nth bit group of the digital speaker array has been calculated.

[0065] When t k +T0≤t <t k When +T, always set S0 = 0. At t = t k At +T0, S1 is set to n-1. At this time, register 26 will store the previously stored value, i.e. or Noted as V n,r And V n,r Compare the threshold V with the (n-1)th voltage n-1,th The comparison is performed, and the comparison result is output to the controlled switch module 4 via the voltage holding unit 30 through the multiplexer 27. The comparison result is also used as the selection signal S2 of the third multiplexer 23. For example, when V... n,r >V n-1,th hour, The signal will be set to high level, and output to the controlled switch module 4 via the voltage holding unit 30 through the demultiplexer 27. The selection signal S2 = 1 will also be output to the third multiplexer 23. Since S2 = 1, the previously stored value V in register 26 will be... n,r Compare the threshold V with the (n-1)th voltage n-1,th The difference is stored in register 26, that is, V n,r -V n-1,th Store in register 26. When V n,r <V n-1,th hour, The signal will be set to low level and output to the controlled switch module 4 via demultiplexer 27, and the selection signal S2 = 0 will be output to the third multiplexer 23; since S2 = 0, the previous stored value V in register 26 will be... n,r Continue storing in register 26. At this point, the drive voltage for the (n-1)th bit group of the digital speaker array has been calculated. And so on, based on... Figure 3 The hardware architecture shown calculates all digital audio sub-signals. Before each loop begins, T0 and other relevant parameters should be appropriately selected to ensure that all signals are in a stable state. The sound reconstruction device provided by this invention has high compatibility and can adapt to digital speaker arrays of different sizes without requiring customized hardware for different speaker array sizes. Furthermore, each bit group in the digital speaker array 6 uses the same hardware module, thus achieving efficient utilization of hardware resources and reducing hardware costs. The required number of enable control signals is also small, and the control process is relatively simple. The voltage holding unit 30 ensures the stability of the digital audio sub-signals. After the calculation is completed, it can be maintained for a duration of one period T. For example, the voltage holding unit 30 can be a latch.

[0066] Furthermore, Figure 6 This is a partial structural schematic diagram of a sound reconstruction device according to an embodiment of the present invention, with reference to... Figure 6 The sound reconstruction device also includes:

[0067] The delay module includes a first delay unit 71, a second delay unit 72, a third delay unit 73, and a fourth delay unit 74.

[0068] The first delay unit 71 is located at the third multiplexer 23 and connected to the first input terminal of the third multiplexer 23. The second delay unit 72 is located at the third multiplexer 23 and connected to the second input terminal of the third multiplexer 23. The third delay unit 73 is located at the third multiplexer 23 and connected to the output terminal of the third multiplexer 23. The fourth delay unit 74 is located at the third multiplexer 23 and connected to the enable terminal of the third multiplexer 23.

[0069] Specifically, delay units are provided at the input, output and enable terminals of the third multiplexer 23 to ensure that when the register 26 updates the stored value, the input, output and enable signals of the third multiplexer 23 are all in a stable state, so as to ensure that the stored value stored in the register 26 is correct.

[0070] Furthermore, Figure 7 This is a structural schematic diagram of another sound reconstruction device according to an embodiment of the present invention, with reference to... Figure 7 The sound reconstruction device also includes:

[0071] Clamping module 7;

[0072] The clamping module 7 is connected to the second end of the drive module 5.

[0073] Specifically, connecting the clamping module 7 to the second end of the drive module 5 can prevent the drive module 5 from floating or outputting uncertain signals. For example, the clamping module 7 can be a pull-up resistor or a pull-down resistor, and this embodiment of the present invention does not limit this.

[0074] Furthermore, Figure 8 This is a structural schematic diagram of another sound reconstruction device according to an embodiment of the present invention, with reference to... Figure 8 The sound reconstruction device also includes:

[0075] Amplification module 8;

[0076] The first end of the amplification module 8 is connected to the third end of the controlled switch module 4, and the second end of the amplification module 8 is connected to the first end of the drive module 5.

[0077] Specifically, the amplification module 8 first amplifies the carrier signal sent by the carrier output module 3, and then transmits the amplified carrier signal to the drive module 5 to drive the digital speaker array 6.

[0078] Furthermore, if the carrier signal includes a sine wave or a triangular wave, the controlled switch includes an analog switching device; if the carrier signal includes a square wave, the controlled switch includes an analog switching device or a logic gate device.

[0079] Specifically, if the carrier signal is a square wave, the controlled switch can be configured as a logic gate device, reducing production costs. Furthermore, a square wave is a sine wave composed of multiple superimposed harmonics, resulting in low harmonic distortion, and the demodulated audio signal has minimal impact on the total harmonic distortion. The logic gate devices include NAND gate devices.

[0080] Furthermore, the comparison unit includes a comparator or a Schmitt latch.

[0081] Furthermore, if the carrier signal includes a sine wave or a triangular wave, the drive module includes an analog audio amplifier; if the carrier signal includes a square wave, the drive module includes an analog audio amplifier or a MOSFET driver.

[0082] The analog audio amplifier can be a Class AB audio amplifier, a Class D audio amplifier, etc., and this embodiment of the invention does not limit this, in order to provide low output impedance, sufficient drive current, and voltage amplification. The MOSFET driver can be a half-bridge driver, a full-bridge driver, etc., and this embodiment of the invention does not limit this.

[0083] This utility model provides an embodiment of a digital loudspeaker, see reference. Figure 1The digital loudspeaker includes a digital loudspeaker array 6 and a sound reconstruction device as described in any of the above embodiments; the sound reconstruction device is connected to the digital loudspeaker array 6. By connecting the sound reconstruction device to the digital loudspeaker array 6, sound reconstruction of the digital loudspeaker array 6 is achieved.

[0084] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0085] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sound reconstruction device, characterized in that, include: Audio input module, control module, carrier output module, controlled switch module, and driver module; The audio input module is connected to the first end of the control module, and the audio input module is used to transmit the analog audio signal to be output to the control module; The second end of the control module is connected to the first end of the controlled switch module. The control module is used to convert the received analog audio signal into a digital audio signal corresponding to the analog audio signal, and transmit the digital audio signal to the controlled switch module. The second terminal of the controlled switch module is connected to the carrier output module, the third terminal of the controlled switch module is connected to the first terminal of the drive module, and the second terminal of the drive module is connected to the digital speaker array. The controlled switch module is used to control the connection and disconnection between the carrier output module and the drive module based on the digital audio signal. The carrier output module is used to generate a carrier signal and send the carrier signal to the controlled switch module; the drive module is used to drive the digital speaker array to work based on the carrier signal.

2. The sound reconstruction device according to claim 1, characterized in that, The controlled switch module includes multiple controlled switches; The second end of the control module includes multiple connection ports, each corresponding to and connected to one of the controlled switches; the carrier output module includes multiple carrier output ports, each corresponding to and connected to one of the controlled switches; the drive module includes multiple drive receiving ports, each corresponding to and connected to one of the controlled switches.

3. The sound reconstruction apparatus according to claim 1, characterized in that, The control module includes: The system includes a first multiplexer, a second multiplexer, a third multiplexer, a comparison unit, a subtractor, a register, a demultiplexer, a threshold calculation unit, a voltage holding unit, and an enable output unit. The audio input module is connected to the first input terminal of the first multiplexer, the output terminal of the register is connected to the second input terminal of the first multiplexer, the output terminal of the first multiplexer is connected to the first input terminal of the comparison unit, the output terminal of the second multiplexer is connected to the second input terminal of the comparison unit, the output terminal of the comparison unit is connected to the first input terminal of the demultiplexer, and the output terminal of the demultiplexer is connected to the controlled switch module through the voltage holding unit. The threshold calculation unit is connected to the first input terminal of the second multiplexer, the output terminal of the second multiplexer is connected to the second terminal of the subtractor, the output terminal of the first multiplexer is connected to the second terminal of the subtractor and the first input terminal of the third multiplexer, the output terminal of the subtractor is connected to the second input terminal of the third multiplexer, the output terminal of the comparison unit is connected to the enable terminal of the third multiplexer, and the output terminal of the third multiplexer is connected to the input terminal of the register. The first output terminal of the enable output module is connected to the enable terminal of the first multiplexer, the second output terminal of the enable output module is connected to the enable terminal of the second multiplexer, and the third output terminal of the enable output module is connected to the enable terminal of the demultiplexer. The enable output module is used to output a first enable signal to the first multiplexer and a second enable signal to the second multiplexer and the demultiplexer.

4. The sound reconstruction apparatus according to claim 3, characterized in that, Also includes: Delay module; The delay module includes a first delay unit, a second delay unit, a third delay unit, and a fourth delay unit; The first delay unit is located at the third multiplexer and connected to the first input terminal of the third multiplexer; the second delay unit is located at the third multiplexer and connected to the second input terminal of the third multiplexer; the third delay unit is located at the third multiplexer and connected to the output terminal of the third multiplexer; and the fourth delay unit is located at the third multiplexer and connected to the enable terminal of the third multiplexer.

5. The sound reconstruction apparatus according to claim 1, characterized in that, Also includes: Clamping module; The clamping module is connected to the second end of the driving module.

6. The sound reconstruction apparatus according to claim 1, characterized in that, Also includes: Amplification module; The first end of the amplification module is connected to the third end of the controlled switch module, and the second end of the amplification module is connected to the first end of the drive module.

7. The sound reconstruction apparatus according to claim 2, characterized in that, If the carrier signal includes a sine wave or a triangular wave, the controlled switch includes an analog switching device; if the carrier signal includes a square wave, the controlled switch includes an analog switching device or a logic gate device.

8. The sound reconstruction apparatus according to claim 3, characterized in that, The comparison unit includes a comparator or a Schmitt latch.

9. The sound reconstruction apparatus according to claim 1, characterized in that, If the carrier signal includes a sine wave or a triangular wave, the driving module includes an analog audio amplifier; if the carrier signal includes a square wave, the driving module includes an analog audio amplifier or a MOSFET driver.

10. A digital loudspeaker, characterized in that, include: Digital loudspeaker array and the sound reconstruction apparatus according to any one of claims 1-9; The sound reconstruction device is connected to the digital speaker array.

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