Digital sound production method and digital sound production device

Abstract

The present invention provides a digital sound production method and a digital sound production device. The digital sound production method comprises: continuously generating periodic sound production driving signals, wherein each sound production driving signal has a preset period and a preset amplitude; acquiring target acoustic frequency signals, and on the basis of positive and negative polarities and amplitudes of the target acoustic frequency signals at different moments, generating a corresponding number of micro-switch driving signals at different moments; and by means of the corresponding number of micro-switch driving signals at the different moments, controlling a corresponding number of micro-switches in a micro-switch array to be turned on, such that the corresponding number of sound production driving signals are respectively superimposed after passing through the turned-on micro-switches, thereby achieving synthesis and demodulation of the target acoustic frequency signals at the different moments. The digital sound production method and the digital sound production device provided by the present invention are conducive to increasing the sound pressure of target acoustic frequency signals and achieving sound production under a high sound pressure level.

Description

Digital sound production method and digital sound production device TECHNICAL FIELD

[0001] The present application relates to the field of digital sound production, and in particular to a digital sound production method and a digital sound production device. BACKGROUND

[0002] The principle of the existing digital loudspeaker for realizing digital sound production is that a plurality of sound production pixels are driven to produce pulse superposition to realize digital sound production. However, there are positive and negative sound pressure pulses in the sound pressure pulses produced by pixel vibration, and the synthesized single pulse sound pressure exists positive and negative offsetting, which leads to problems such as low sound volume of sound production, low transduction efficiency and the like.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical scheme of the present application and facilitating the understanding of those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art only because it is described in the background section of the present application. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a digital sound production method and a digital sound production device for improving the sound pressure of a target audio signal and realizing high-sound-pressure sound production

[0005] To achieve the above-mentioned purpose and other related purposes, the present application provides a digital sound production method, which comprises:

[0006] continuously generating a periodic sound production driving signal, wherein the sound production driving signal has a preset period and a preset amplitude;

[0007] obtaining a target audio signal, and generating a corresponding number of microswitch driving signals at different time instants based on the positive and negative and amplitude of the target audio signal at different time instants;

[0008] controlling a corresponding number of microswitches in a microswitch array to be turned on by the corresponding number of microswitch driving signals at different time instants, so that the corresponding number of sound production driving signals are superimposed after passing through the turned-on microswitches, to realize the synthesis and demodulation of the target audio signal at different time instants.

[0009] Optionally, the size of the volume of the synthesized and demodulated target audio signal is adjusted by controlling the number of turned-on microswitches in the microswitch array to change in multiples.

[0010] Optionally, the size of the volume of the synthesized and demodulated target audio signal is adjusted by adjusting the size of the preset amplitude.

[0011] Optionally, the method for generating a corresponding number of microswitch driving signals at different time instants comprises:

[0012] the opening position of the micro switch at different time is set according to the positive or negative of the target audio signal at different time and the positive pulse phase or the negative pulse phase of each preset period in the sound generating driving signal;

[0013] the opening number of the micro switch at different time is set according to the amplitude of the target audio signal at different time and the preset amplitude;

[0014] the micro switch driving signal of the corresponding number is generated at different time based on the opening position of the micro switch at different time and the opening number of the micro switch at different time.

[0015] Optionally, the rising slope of the micro switch driving signal is less than or equal to the rising slope of the sound generating driving signal, and the falling slope of the micro switch driving signal is less than or equal to the falling slope of the sound generating driving signal.

[0016] The application further provides a digital sound generating device, which comprises:

[0017] a first sound generating part and a control part, the first sound generating part comprising a sound generating power source, a micro switch array and a chamber;

[0018] the sound generating power source is arranged on the first side of the chamber and is used for continuously generating a periodic sound generating driving signal, wherein the sound generating driving signal has a preset period and a preset amplitude;

[0019] the micro switch array is arranged on the second side of the chamber and is used for controlling the opening of the corresponding number of micro switches based on the corresponding number of micro switch driving signals at different time, so as to realize the synthesis and demodulation of the target audio signal at different time by superimposing the corresponding number of sound generating driving signals;

[0020] the control part is electrically connected with the micro switch array and is used for generating the corresponding number of micro switch driving signals at different time based on the positive or negative and the amplitude of the target audio signal at different time.

[0021] Optionally, the control part is further electrically connected with the sound generating power source and is used for setting the preset period and the preset amplitude.

[0022] Optionally, the control part sets the opening position of the micro switch at different time according to the positive or negative of the target audio signal at different time and the positive pulse phase or the negative pulse phase of each preset period in the sound generating driving signal, sets the opening number of the micro switch at different time according to the amplitude of the target audio signal at different time and the preset amplitude, and generates the micro switch driving signal of the corresponding number at different time based on the opening position of the micro switch at different time and the opening number of the micro switch at different time.

[0023] Optionally, the first sound generating part is replaced by a second sound generating part, the second sound generating part comprising a plurality of sound generating power sources, a plurality of micro switches and a plurality of chambers, one-to-one correspondence; the sound generating power source is arranged on the first side of the chamber, and the micro switch is arranged on the second side of the chamber, wherein the plurality of micro switches constitute the micro switch array.

[0024] Optionally, the sound generating power source comprises an ultrasonic transducer, a piezoelectric sound generator, an electrostatic sound generator or a moving coil sound generator.

[0025] As described above, the digital sound generating method and the digital sound generating device of the present application, by the cooperation of the sound generating power source and the micro switch array, when synthesizing and demodulating the target audio signal, only one kind of pulse superposition is involved at any time, or positive pulse superposition or negative pulse superposition, there is no case of positive and negative pulse offsetting each other, which is conducive to improving the sound pressure of the target audio signal; the present application has the advantages of full-band high-fidelity, high sound pressure sound generation, and small size of the sound generating device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 shows the structure of the digital sound generating device in the embodiment one of the present application.

[0027] Fig. 2 shows the structure of the digital sound generating device in the embodiment two of the present application.

[0028] Fig. 3 shows the flow chart of the digital sound generating method in the embodiment three of the present application.

[0029] Fig. 4 shows a related signal waveform involved in the digital sound generating method in the embodiment three of the present application.

[0030] Fig. 5 shows another related signal waveform involved in the digital sound generating method in the embodiment three of the present application.

[0031] Fig. 6 shows another related signal waveform involved in the digital sound generating method in the embodiment three of the present application.

[0032] Fig. 7 shows the switch state diagram of each micro switch at different times in the waveform shown in Fig. 6.

[0033] Element No. Explanation 10 Digital sound generating device 100 First sound generating unit 110 Sound generating power source 120 Micro switch array 121-12n Micro switch 130 Chamber 200 Control unit 300 Second sound generating unit 310 Sound generating power source 320 Micro switch array 320a Micro switch 330 Chamber DETAILED DESCRIPTION

[0034] Other advantages and effects of the present application can be easily understood by those skilled in the art from the above description. The present application can also be implemented or applied in other different embodiments, and the details in the present description can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0035] Please refer to FIG. 1 to FIG. 7. It is to be noted that the diagrams provided in the present embodiment only schematically illustrate the basic concept of the present application, and thus the diagrams only show the components related to the present application but not the actual number, shape and size of the components in actual implementation, and the shape, number and ratio of the components in actual implementation can be arbitrarily changed, and the layout of the components can be more complicated.

[0036] Embodiment One

[0037] As shown in FIG. 1, the present embodiment provides a digital sound generating device 10, which comprises a first sound generating unit 100 and a control unit 200; wherein the first sound generating unit 100 comprises a sound generating power source 110, a micro switch array 120 and a chamber 130.

[0038] The sound generating power source 110 is arranged at the first side of the chamber 130, and is used to continuously generate a periodic sound generating driving signal, wherein the sound generating driving signal has a preset period and a preset amplitude.

[0039] Specifically, the sound generating power source 110 is controlled by the control unit 200 to continuously generate a sound generating driving signal with a preset period and a preset amplitude, wherein the sound generating driving signal is a high-frequency digital signal, including positive and negative pulses; in actual application, the higher the frequency of the sound generating driving signal, the better the accuracy of the final synthesized and demodulated target audio signal. In an example, the sound generating power source 110 includes an ultrasonic transducer, a piezoelectric sound generator, an electrostatic sound generator, or a moving coil sound generator, of course, the sound generating power source 110 can also include other forms of sound generators, which are not limited.

[0040] The microswitch array 120 is arranged on the second side of the cavity 130, and a corresponding number of microswitches are opened based on a corresponding number of microswitch driving signals at different times to synthesize and demodulate the target audio signal at different times by superimposing a corresponding number of sound generating driving signals.

[0041] Specifically, the microswitch array 120 includes n (n≥2) microswitches 121-12n, each microswitch 121-12n is controlled by a corresponding microswitch driving signal to open or close, for example, when the corresponding microswitch driving signal is low, the corresponding microswitch is closed, and vice versa, when the corresponding microswitch driving signal is high, the corresponding microswitch is opened; in an example, each microswitch 121-12n is a micro-electro-mechanical switch. In the microswitch array 120 of the present embodiment, each microswitch 121-12n is switched between the closed state and the open state under the control of the corresponding microswitch driving signal.

[0042] The cavity 130 is used to fix the sound generating power source 110 and the microswitch array 120, and cooperates with the sound generating power source 110 and the microswitch array 120 to provide a sound generating space, so as to avoid the sound generating driving signal generated by the sound generating power source 110 from overflowing through other channels other than the microswitch, thereby affecting the synthesis and demodulation of the target audio signal. Wherein, the first side of the cavity 130 and the second side of the cavity 130 are opposite sides; in an example, the first side of the cavity 130 is the lower side, and the second side of the cavity 130 is the upper side. In actual application, the sound generating power source 110, the microswitch array 120 and the cavity 130 can be an integral structure or a combined structure, which has no substantial effect on the present embodiment.

[0043] In the first sound generating unit 100 of the present embodiment, the sound generating power source 110 and the microswitch array 120 are arranged on opposite sides of the cavity 130, so that when all the microswitches 121-12n in the microswitch array 120 are closed, the sound generating driving signal continuously generated by the sound generating power source 110 cannot be emitted, and when a microswitch in the microswitch array 120 is opened, the sound generating driving signal continuously generated by the sound generating power source 110 can be emitted directly through the opened microswitch.

[0044] The control unit 200 is electrically connected with the microswitch array 120, and generates a corresponding number of microswitch driving signals at different time based on the positive and negative and amplitude of the target audio signal at different time. Further, the control unit 200 is also electrically connected with the sound generating power source 110, and is used for setting the preset period and the preset amplitude.

[0045] Specifically, the control unit 200 sets the opening positions of the microswitches at different time corresponding to the positive pulse phase or the negative pulse phase of each preset period of the sound generating driving signal based on the positive and negative of the target audio signal at different time. The control unit 200 sets the opening number of the microswitches at different time based on the amplitude of the target audio signal at different time and the preset amplitude, wherein the opening number of the microswitches at a certain time is equal to the amplitude of the target audio signal at the time divided by the preset amplitude. The control unit 200 also generates a corresponding number of microswitch driving signals at different time based on the opening positions of the microswitches at different time and the opening number of the microswitches at different time.

[0046] Embodiment Two

[0047] As shown in FIG. 2, the embodiment provides a digital sound generating device 10, which is different from the first embodiment in the first sound generating unit 100. In the embodiment, the second sound generating unit 300 is used to replace the first sound generating unit 100 in the first embodiment. At this time, the digital sound generating device 10 comprises the second sound generating unit 300 and the control unit 200.

[0048] The second sound generating unit 300 comprises a plurality of sound generating power sources 310, a plurality of microswitches 320a and a plurality of chambers 330, which are one-to-one corresponding. The sound generating power source 310 is arranged at the first side of the chamber 330, the microswitch 320a is arranged at the second side of the chamber 330, and the plurality of microswitches 320a constitute a microswitch array 320. Of course, it is also feasible that the sound generating power source 310, the microswitch 320a and the chamber 330 are not completely one-to-one corresponding, for example, the second sound generating unit 300 comprises two parts: in the first part, one sound generating power source 310 corresponds to one chamber 330 and at least two microswitches 320, and in the second part, one sound generating power source 310 corresponds to one chamber 330 and one microswitch 320. It should be noted that the second sound generating unit 300 in the embodiment is only different from the first sound generating unit 100 in the first embodiment in structure, and is completely same in function, so it is not described here.

[0049] Embodiment Three

[0050] As shown in FIG. 3, the embodiment provides a digital sound production method, including steps S1 to S3; wherein the digital sound production method can be implemented based on the digital sound production device 10 described in embodiment one or embodiment two, of course, can also be implemented based on other structures of digital sound production device, which is not limited. Below, referring to FIGS. 3-7, the digital sound production method of the embodiment is introduced.

[0051] Step S1, continuously generating a periodic sound production driving signal, wherein the sound production driving signal has a preset period and a preset amplitude. In practical application, the sound production driving signal is a high-frequency digital signal, including positive and negative pulses; and the higher the frequency of the sound production driving signal, the better the accuracy of the final synthesized and demodulated target audio signal.

[0052] Step S2, obtaining a target audio signal, and generating a corresponding number of microswitch driving signals at different times based on the positive and negative and amplitude of the target audio signal at different times. Specifically, the method of generating a corresponding number of microswitch driving signals at different times includes the following steps. Step S21, based on the positive and negative of the target audio signal at different times, setting the opening position of the microswitch at different times corresponding to the positive pulse phase or negative pulse phase of each preset period in the sound production driving signal. Step S22, based on the amplitude of the target audio signal at different times and the preset amplitude, setting the opening number of the microswitch at different times; wherein the opening number of the microswitch at a certain time is equal to the amplitude of the target audio signal at that time divided by the preset amplitude. Step S23, based on the opening position of the microswitch at different times and the opening number of the microswitch at different times, generating a corresponding number of microswitch driving signals at different times. It should be noted that the execution order of step S2 and step S1 can be exchanged, which has no substantial effect on the embodiment.

[0053] In an example, all the target audio signals at different times are positive; if the amplitude of the target audio signal at a certain time is twice the preset amplitude, then: the opening position of the microswitch at that time is set corresponding to the positive pulse phase in the corresponding preset period of the sound production driving signal, and the opening number of the microswitch at that time is set to two, so that the microswitch driving signal with an opening number of two and an opening position corresponding to the positive pulse phase in the corresponding preset period is generated at that time; if the amplitude of the target audio signal at a certain time is three times the preset amplitude, then: the opening position of the microswitch at that time is set corresponding to the positive pulse phase in the corresponding preset period of the sound production driving signal, and the opening number of the microswitch at that time is set to three, so that the microswitch driving signal with an opening number of three and an opening position corresponding to the positive pulse phase in the corresponding preset period is generated at that time; as shown in the dashed box in FIG. 4.

[0054] In another example, all the target audio signals at different time points are negative; if the amplitude of the target audio signal at a time point is twice the preset amplitude, then: the opening position of the micro switch at the time point is set at the negative pulse phase in the corresponding preset period of the sound generating driving signal, and the number of openings of the micro switch at the time point is set to two, so that the micro switch driving signal with the number of openings of two and the opening position corresponding to the negative pulse phase in the corresponding preset period is generated at the time point; if the amplitude of the target audio signal at a time point is three times the preset amplitude, then: the opening position of the micro switch at the time point is set at the negative pulse phase in the corresponding preset period of the sound generating driving signal, and the number of openings of the micro switch at the time point is set to three, so that the micro switch driving signal with the number of openings of three and the opening position corresponding to the negative pulse phase in the corresponding preset period is generated at the time point; as shown in the dashed box in FIG. 5.

[0055] In yet another example, the target audio signals at some time points are positive and the target audio signals at some time points are negative; if the target audio signal at a time point is positive and the amplitude is twice the preset amplitude, then: the opening position of the micro switch at the time point is set at the positive pulse phase in the corresponding preset period of the sound generating driving signal, and the number of openings of the micro switch at the time point is set to two, so that the micro switch driving signal with the number of openings of two and the opening position corresponding to the positive pulse phase in the corresponding preset period is generated at the time point; if the target audio signal at a time point is negative and the amplitude is twice the preset amplitude, then: the opening position of the micro switch at the time point is set at the negative pulse phase in the corresponding preset period of the sound generating driving signal, and the number of openings of the micro switch at the time point is set to two, so that the micro switch driving signal with the number of openings of two and the opening position corresponding to the negative pulse phase in the corresponding preset period is generated at the time point, as shown in the dashed box in FIG. 6.

[0056] In step S3, the corresponding number of micro switches in the micro switch array are controlled to open by the corresponding number of micro switch driving signals at different time points, so that the corresponding number of sound generating driving signals are respectively superimposed after passing through the opened micro switches, thereby realizing the synthesis and demodulation of the target audio signals at different time points.

[0057] For example, at a certain moment, two microswitches in the microswitch array 130 are open. At this moment, if the open positions of the two microswitches correspond to the positive pulse phases of the corresponding preset period in the sound generating driving signal, then after the sound generating driving signal passes through the two microswitches, two positive pulses are superimposed. If the open positions of the two microswitches correspond to the negative pulse phases of the corresponding preset period in the sound generating driving signal, then after the sound generating driving signal passes through the two microswitches, two negative pulses are superimposed. For another example, at a certain moment, three microswitches in the microswitch array 130 are open. At this moment, if the open positions of the three microswitches correspond to the positive pulse phases of the corresponding preset period in the sound generating driving signal, then after the sound generating driving signal passes through the three microswitches, three positive pulses are superimposed. If the open positions of the three microswitches correspond to the negative pulse phases of the corresponding preset period in the sound generating driving signal, then after the sound generating driving signal passes through the three microswitches, three negative pulses are superimposed. In this way, the synthesis and demodulation of the target sound frequency signal at different moments are realized. Taking the example of the target sound frequency signal being positive at some moments and negative at some moments, the switch states of the microswitches at different moments are shown in FIG. 7. In the figure, the square frame without filling represents that the microswitch is in the closed state, and the square frame with diagonal line filling represents that the microswitch is in the open state.

[0058] In the digital sound generating method of the embodiment, at a certain moment: if the target sound frequency signal needs a number of positive pulses to be superimposed, then a corresponding number of microswitches can be controlled to be open at the corresponding positive pulse phases in the sound generating driving signal by the microswitch driving signal, and all the microswitches can be controlled to be closed at the corresponding negative pulse phases in the sound generating driving signal; if the target sound frequency signal needs a number of negative pulses to be superimposed, then all the microswitches can be controlled to be closed at the corresponding positive pulse phases in the sound generating driving signal by the microswitch driving signal, and a corresponding number of microswitches can be controlled to be open at the corresponding negative pulse phases in the sound generating driving signal, so as to realize the synthesis and demodulation of the target sound frequency signal at different moments, thereby completing the sound reconstruction. When the synthesis and demodulation of the target sound frequency signal are performed in the above manner, only one kind of pulse superposition, or only positive pulse superposition, or only negative pulse superposition is involved at any moment, and there is no case of positive and negative pulse mutual cancellation, so that the finally synthesized and demodulated target sound frequency signal has high sound pressure, that is, high volume. Moreover, the sound is generated in a digital manner, which can cover a lower frequency band, for example, a frequency band lower than 1 KHz, and is conducive to realizing full-band (i.e., 20 Hz-20000 Hz) sound generation.

[0059] In addition, the digital sound production method can also adjust the volume size, so as to further improve the sound pressure of the target audio signal. In an example, the volume size of the synthesized and demodulated target audio signal is adjusted by controlling the multiple change of the number of opened microswitches in the microswitch array, so as to realize the adjustable volume size. In the whole process of synthesizing and demodulating the target audio signal, the multiple change of the number of opened microswitches at any time is constant. In the specific implementation, the microswitch array can be divided into at least two groups, and the number of opened groups is adjusted to control the multiple change of the number of opened microswitches in the microswitch array. For example, the microswitch array is divided into four groups, the first group is used for synthesizing and demodulating the target audio signal, and the second to fourth groups are used for adjusting the volume size of the target audio signal. At this time, if two groups are opened at the same time, the volume of the target audio signal is increased by 1 times, and if three groups are opened at the same time, the volume of the target audio signal is increased by 2 times. The number of opened microswitches in each group is the same at the same time. Taking FIG. 4 as an example, FIG. 4 shows the case of opening one group. If one more group is opened on this basis, the number of opened microswitches at each time needs to be multiplied by 2, so it can be regarded as increasing the volume by 1 times. In another example, the volume size of the finally synthesized and demodulated target audio signal is adjusted by adjusting the size of the preset amplitude of the sound production driving signal, so as to realize the adjustable volume size. At this time, the microswitch array is not grouped or only one group is opened, the number of opened microswitches is unchanged, and the volume size is adjusted by adjusting the size of the preset amplitude. For example, the preset amplitude is adjusted to be 2 times of the original, and the amplitude of the target audio signal at each time is increased by 1 times without changing the number of opened microswitches at each time, so it can be regarded as increasing the volume by 1 times.

[0060] In practical application, the rising slope of the microswitch driving signal can be designed to be less than or equal to the rising slope of the sound production driving signal, and the falling slope of the microswitch driving signal can be designed to be less than or equal to the falling slope of the sound production driving signal, so as to reduce the noise generated by the microswitch when performing switching action.

[0061] In summary, the digital sound production method and the digital sound production device can cooperate the sound production power source with the microswitch array. In the process of synthesizing and demodulating the target audio signal, only one kind of pulse is involved at any time, or the superposition of positive pulses or the superposition of negative pulses, and there is no mutual offset between positive and negative pulses, which is conducive to improving the sound pressure of the target audio signal. The present application has the advantages of full-band high-fidelity, high-sound-pressure sound production, and small size of the sound production device. Therefore, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0062] The above embodiments are only illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A method of digitally generating sound, characterized by, The digital sound production method comprises: continuously generating a periodic sound production driving signal, wherein the sound production driving signal has a preset period and a preset amplitude; obtaining a target audio signal, and generating a corresponding number of microswitch driving signals at different time instants based on the sign and amplitude of the target audio signal at different time instants; controlling a corresponding number of microswitches in a microswitch array to be turned on through the corresponding number of microswitch driving signals at different time instants, so that the corresponding number of sound production driving signals are superimposed after passing through the turned-on microswitches, to realize synthesis and demodulation of the target audio signal at different time instants.

2. The digital sound production method of claim 1, wherein, The number of turned-on microswitches in the microswitch array is controlled to change in multiples, to adjust the volume of the synthesized and demodulated target audio signal.

3. The digital sound production method of claim 1, wherein, The volume of the synthesized and demodulated target audio signal is adjusted by adjusting the size of the preset amplitude.

4. The digital sound production method of claim 1, wherein, The method for generating a corresponding number of microswitch driving signals at different time instants comprises: based on the sign of the target audio signal at different time instants, setting the turning-on positions of the microswitches at different time instants corresponding to the positive pulse phase or negative pulse phase of each preset period in the sound production driving signal; based on the amplitude of the target audio signal at different time instants and the preset amplitude, setting the number of turned-on microswitches at different time instants; based on the turning-on positions of the microswitches at different time instants and the number of turned-on microswitches at different time instants, generating a corresponding number of microswitch driving signals at different time instants.

5. The digital sound production method according to claim 1 or 4, characterized in that, The rising slope of the microswitch driving signal is less than or equal to the rising slope of the sound production driving signal, and the falling slope of the microswitch driving signal is less than or equal to the falling slope of the sound production driving signal.

6. A digital sound production device, characterized by The digital sound production device comprises: a first sound production part and a control part, the first sound production part comprising a sound production power source, a microswitch array and a chamber; the sound production power source is arranged on the first side of the chamber, for continuously generating a periodic sound production driving signal, wherein the sound production driving signal has a preset period and a preset amplitude; the microswitch array is arranged on the second side of the chamber, and a corresponding number of microswitches are controlled to be turned on based on a corresponding number of microswitch driving signals at different time instants, so as to realize synthesis and demodulation of a target audio signal at different time instants by superimposing a corresponding number of sound production driving signals; the control part is electrically connected with the microswitch array, and generates a corresponding number of microswitch driving signals at different time instants based on the sign and amplitude of the target audio signal at different time instants.

7. The digital sound production device of claim 6, wherein, the control part is also electrically connected with the sound production power source, for setting the preset period and the preset amplitude.

8. The digital sound production device of claim 6 or 7, wherein, the control part sets the turning-on positions of the microswitches at different time instants corresponding to the positive pulse phase or negative pulse phase of each preset period in the sound production driving signal based on the sign of the target audio signal at different time instants, sets the number of turned-on microswitches at different time instants based on the amplitude of the target audio signal at different time instants and the preset amplitude, and generates a corresponding number of microswitch driving signals at different time instants based on the turning-on positions of the microswitches at different time instants and the number of turned-on microswitches at different time instants.

9. The digital sound production device of claim 6, wherein, The first sound production part is replaced by a second sound production part, which comprises a plurality of sound production power sources, a plurality of micro switches and a plurality of chambers, one-to-one correspondence; the sound production power source is arranged on the first side of the chamber, and the micro switch is arranged on the second side of the chamber, wherein a plurality of micro switches constitute the micro switch array.

10. The digital sound production device of claim 6 or 9, wherein, The sound production power source comprises an ultrasonic transducer, a piezoelectric sounder, an electrostatic sounder or a moving coil sounder.

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