Digital sounding method and digital sounding device

Abstract

The invention provides a digital sound production method and a digital sound production device, and the method comprises the steps: continuously generating a periodic sound production driving signal which has a preset period and a preset amplitude; obtaining a target audio signal, and generating a corresponding number of micro-switch driving signals at different moments based on the positive and negative and amplitude values of the target audio signal at different moments; the corresponding number of micro switches in the micro switch array are controlled to be turned on through the corresponding number of micro switch driving signals at different moments, so that the corresponding number of sound production driving signals pass through the turned-on micro switches and then are superposed, and synthesis and demodulation of target audio signals at different moments are realized. According to the digital sound production method and the digital sound production device provided by the invention, the sound pressure of the target audio signal is improved, and high-sound-pressure sound production is realized.

Description

Technical Field

[0001] The present invention relates to the field of digital sound generation, and in particular to a digital sound generation method and a digital sound generation device. Background Art

[0002] The principle of digital sound generation by existing digital speakers is to drive multiple sound pixels to generate pulse superposition to achieve digital sound generation; however, the sound pressure pulses generated by pixel vibration contain positive sound pressure pulses and negative sound pressure pulses, and the synthesized single pulse sound pressure has positive and negative cancellation, resulting in low sound volume, low transducer efficiency and other problems.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a digital sound generation method and a digital sound generation device for increasing the sound pressure of the target audio signal and realizing high sound pressure sound generation.

[0005] To achieve the above-mentioned object and other related objects, the present invention provides a digital sound generation method, which comprises:

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

[0007] Acquire a target audio signal, and generate a corresponding number of micro switch driving signals at different times based on the positive and negative values ​​and amplitudes of the target audio signal at different times;

[0008] 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 times, so that the corresponding number of sound driving signals are superimposed after passing through the opened micro switches respectively, thereby realizing the synthesis and demodulation of the target audio signals at different times.

[0009] Optionally, the volume of the synthesized and demodulated target audio signal is adjusted by controlling the number of micro switches in the micro switch array to change in multiples.

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

[0011] Optionally, the method of generating a corresponding number of micro-switch driving signals at different times includes:

[0012] Based on the positive and negative of the target audio signal at different times, the opening position of the micro switch at different times is set corresponding to the positive pulse phase or negative pulse phase of each preset cycle in the sound driving signal;

[0013] The number of micro switches opened at different times is set based on the amplitude of the target audio signal at different times and the preset amplitude;

[0014] Based on the opening positions of the micro switches at different times and the number of micro switches opened at different times, a corresponding number of micro switch driving signals are generated at different times.

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

[0016] The present invention also provides a digital sound generating device, the digital sound generating device comprising:

[0017] A first sound-generating part and a control part, wherein the first sound-generating part includes a sound-generating power source, a micro-switch array and a chamber;

[0018] The sound power source is disposed on the first side of the chamber, and is used to continuously generate a periodic sound driving signal, wherein the sound driving signal has a preset period and a preset amplitude;

[0019] The micro switch array is disposed on the second side of the chamber, and controls a corresponding number of micro switches to be turned on based on a corresponding number of micro switch driving signals at different times, so as to achieve synthesis and demodulation of target audio signals at different times by superimposing a corresponding number of the sound driving signals;

[0020] The control unit is electrically connected to the micro switch array, and generates a corresponding number of micro switch driving signals at different times based on the positive and negative values ​​and amplitudes of the target audio signals at different times.

[0021] Optionally, the control unit is also electrically connected to the sound power source for setting the preset period and the preset amplitude.

[0022] Optionally, the control unit sets the opening position of the micro switches at different times at the positive pulse phase or negative pulse phase of each preset period in the sound driving signal based on the positive and negative of the target audio signal at different times, and sets the number of micro switches opened at different times based on the amplitude of the target audio signal at different times and the preset amplitude, and generates a corresponding number of micro switch driving signals at different times based on the opening position of the micro switches at different times and the number of micro switches opened at different times.

[0023] Optionally, a second sound-emitting part is used to replace the first sound-emitting part, and the second sound-emitting part includes a plurality of sound power sources, a plurality of micro switches and a plurality of chambers, which correspond to each other one by one; the sound 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 power source includes an ultrasonic transducer, a piezoelectric sound generator, an electrostatic sound generator or a moving coil sound generator.

[0025] As described above, the digital sound generation method and the digital sound generation device of the present invention, through the cooperation of the sound generation power source and the micro switch array, only involve the superposition of one pulse at any time when synthesizing and demodulating the target audio signal, either the superposition of positive pulses or the superposition of negative pulses, and there is no situation where the positive and negative pulses cancel each other out, which is beneficial to improving the sound pressure of the target audio signal; the present invention has the advantages of high fidelity in the full frequency band, high sound pressure sound generation, and a small size of the sound generation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It shows a schematic diagram of the structure of the digital sound generating device in the first embodiment of the present invention.

[0027] Figure 2 The figure shows the structure of the digital sound generating device in the second embodiment of the present invention.

[0028] Figure 3 Shown is a flow chart of the digital sound generation method in the third embodiment of the present invention.

[0029] Figure 4 Shown is a relevant signal waveform diagram involved in the digital sound generation method in the third embodiment of the present invention.

[0030] Figure 5 Shown is another related signal waveform diagram involved in the digital sound generation method in the third embodiment of the present invention.

[0031] Figure 6 Shown is another related signal waveform diagram involved in the digital sound generation method in the third embodiment of the present invention.

[0032] Figure 7 Display as Figure 6 Schematic diagram of the switching state of each micro switch at different times in the waveform shown.

[0033] Component number description

[0034] 10 Digital sound device

[0035] 100 First Voice

[0036] 110 Sound Power Source

[0037] 120 Micro Switch Array

[0038] 121~12n Micro switch

[0039] 130 Chamber

[0040] 200 Control Department

[0041] 300 Second Voice

[0042] 310 Sound Power Source

[0043] 320 Micro Switch Array

[0044] 320a Micro switch

[0045] 330 Chamber DETAILED DESCRIPTION

[0046] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0047] See also Figures 1 to 7 It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the illustrations only show the components related to the present invention rather than the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0048] Embodiment 1

[0049] like Figure 1 As shown, this embodiment provides a digital sound device 10 , including a first sound-emitting part 100 and a control part 200 ; wherein the first sound-emitting part 100 includes a sound power source 110 , a micro-switch array 120 and a chamber 130 .

[0050] The sound power source 110 is disposed at a first side of the chamber 130 and is used to continuously generate a periodic sound driving signal, wherein the sound driving signal has a preset period and a preset amplitude.

[0051] Specifically, the sound power source 110 is controlled by the control unit 200 to continuously generate a sound driving signal with a preset period and a preset amplitude, wherein the sound driving signal is a high-frequency digital signal, including positive pulses and negative pulses; in practical applications, the higher the frequency of the sound driving signal, the better the accuracy of the target audio signal finally synthesized and demodulated. In one example, the sound power source 110 includes an ultrasonic transducer, a piezoelectric sound generator, an electrostatic sound generator, or a dynamic sound generator. Of course, the sound power source 110 may also include other forms of sound generators, which are not limited to this.

[0052] The micro switch array 120 is disposed on the second side of the chamber 130, and controls a corresponding number of micro switches to be turned on based on a corresponding number of micro switch driving signals at different times, so as to achieve synthesis and demodulation of target audio signals at different times by superimposing a corresponding number of sound driving signals.

[0053] Specifically, the micro switch array 120 includes n (n≥2) micro switches 121-12n, each of which is controlled by its own micro switch drive signal to be turned on or off. For example, when the corresponding micro switch drive signal is at a low level, the corresponding micro switch is turned off, and vice versa, when the corresponding micro switch drive signal is at a high level, the corresponding micro switch is turned on. In one example, each of the micro switches 121-12n is a micro-electromechanical switch. In the micro switch array 120 of this embodiment, each of the micro switches 121-12n is controlled by its own micro switch drive signal to switch between a closed state and an open state.

[0054] The chamber 130 is used to fix the sound power source 110 and the micro switch array 120, and cooperate with the sound power source 110 and the micro switch array 120 to provide a sound space to prevent the sound driving signal generated by the sound power source 110 from overflowing through other channels except the micro switch, thereby affecting the synthesis and demodulation of the target audio signal. Among them, the first side of the chamber 130 and the second side of the chamber 130 are opposite sides; in one example, the first side of the chamber 130 is the lower side, and the second side of the chamber 130 is the upper side. In actual applications, the sound power source 110, the micro switch array 120 and the chamber 130 can be an integrated structure or a combined structure, which has no substantial impact on this embodiment.

[0055] In the first sound-emitting part 100 of the present embodiment, the sound power source 110 and the micro-switch array 120 are respectively arranged on opposite sides of the chamber 130. Therefore, when all the micro-switches 121~12n in the micro-switch array 120 are closed, the sound driving signal continuously generated by the sound power source 110 cannot be emitted. When a micro-switch in the micro-switch array 120 is turned on, the sound driving signal continuously generated by the sound power source 110 can be directly emitted through the turned-on micro-switch.

[0056] The control unit 200 is electrically connected to the micro-switch array 120, and based on the positive and negative and amplitude of the target audio signal at different times, generates a corresponding number of micro-switch driving signals at different times; further, the control unit 200 is also electrically connected to the sound power source 110 for setting a preset period and a preset amplitude.

[0057] Specifically, the control unit 200 sets the opening position of the micro switches at different times at the positive pulse phase or the negative pulse phase of each preset period in the sound driving signal based on the positive and negative of the target audio signal at different times; the control unit 200 sets the number of micro switches opened at different times based on the amplitude of the target audio signal at different times and the preset amplitude, wherein the number of micro switches opened at a certain moment is equal to the amplitude of the target audio signal at that moment divided by the preset amplitude; the control unit 200 also generates a corresponding number of micro switch driving signals at different times based on the opening positions of the micro switches at different times and the number of micro switches opened at different times.

[0058] Embodiment 2

[0059] like Figure 2 As shown, this embodiment provides a digital sound-generating device 10, which differs from the first embodiment in the first sound-generating part 100; in this embodiment, the second sound-generating part 300 is used to replace the first sound-generating part 100 in the first embodiment. At this time, the digital sound-generating device 10 includes the second sound-generating part 300 and the control part 200.

[0060] The second sound-emitting part 300 includes a plurality of sound-emitting power sources 310, a plurality of micro switches 320a and a plurality of chambers 330, which correspond to each other one by one; wherein the sound-emitting power source 310 is arranged on the first side of the chamber 330, the micro switch 320a is arranged on the second side of the chamber 330, and the plurality of micro switches 320a constitute a micro switch array 320. Of course, it is also feasible that the sound-emitting power source 310, the micro switch 320a and the chamber 330 do not completely correspond to each other one by one. For example, the second sound-emitting part 300 includes two parts: in the first part, one sound-emitting power source 310 corresponds to one chamber 330 and at least two micro switches 320, and in the second part, one sound-emitting power source 310 corresponds to one chamber 330 and one micro switch 320. It should be noted that the second sound-emitting part 300 in this embodiment and the first sound-emitting part 100 in the first embodiment are only different in structure, and are completely identical in function, so they will not be described here.

[0061] Embodiment 3

[0062] like Figure 3As shown, this embodiment provides a digital sound generation method, including steps S1 to S3; wherein the digital sound generation method can be implemented based on the digital sound generation device 10 described in the first embodiment or the second embodiment, and of course, can also be implemented based on digital sound generation devices of other structures, without limitation. Figure 3 to Figure 7 , the digital sound generation method of this embodiment is introduced.

[0063] Step S1, continuously generating a periodic sound driving signal, wherein the sound driving signal has a preset period and a preset amplitude. In practical applications, the sound driving signal is a high-frequency digital signal, including positive pulses and negative pulses; and the higher the frequency of the sound driving signal, the better the accuracy of the target audio signal finally synthesized and demodulated.

[0064] Step S2, obtaining the target audio signal, and generating a corresponding number of micro-switch drive signals at different times based on the positive and negative and amplitude of the target audio signal at different times. Specifically, the method for generating a corresponding number of micro-switch drive signals at different times includes the following steps. Step S21, based on the positive and negative of the target audio signal at different times, the opening position of the micro-switch at different times is set at the positive pulse phase or negative pulse phase of each preset cycle in the sound drive signal. Step S22, based on the amplitude of the target audio signal at different times and the preset amplitude, the number of micro-switches opened at different times is set; wherein, the number of micro-switches opened at a certain moment is equal to the amplitude of the target audio signal at that moment divided by the preset amplitude. Step S23, based on the opening position of the micro-switch at different times and the number of micro-switches opened at different times, a corresponding number of micro-switch drive signals are generated at different times. It should be noted that the execution order of step S2 and step S1 can be interchanged, which has no substantial impact on this embodiment.

[0065] In one example, the target audio signal at all moments is positive; if the amplitude of the target audio signal at a certain moment is twice the preset amplitude, then: the opening position of the microswitch at that moment is set at the positive pulse phase in the corresponding preset cycle of the sound driving signal and the number of microswitches opened at that moment is set to two, so that at that moment, a microswitch driving signal with two openings and an opening position corresponding to the positive pulse phase in the corresponding preset cycle is generated; if the amplitude of the target audio signal at a certain moment is three times the preset amplitude, then: the opening position of the microswitch at that moment is set at the positive pulse phase in the corresponding preset cycle of the sound driving signal and the number of microswitches opened at that moment is set to three, so that at that moment, a microswitch driving signal with three openings and an opening position corresponding to the positive pulse phase in the corresponding preset cycle is generated; Figure 4 Shown in the dashed box.

[0066] In another example, the target audio signal at all moments is negative; if the amplitude of the target audio signal at a certain moment is twice the preset amplitude, then: the opening position of the microswitch at that moment is set at the negative pulse phase in the corresponding preset cycle of the sound driving signal and the number of microswitches opened at that moment is set to two, so that at this moment, a microswitch driving signal with two openings and an opening position corresponding to the negative pulse phase in the corresponding preset cycle is generated; if the amplitude of the target audio signal at a certain moment is three times the preset amplitude, then: the opening position of the microswitch at that moment is set at the negative pulse phase in the corresponding preset cycle of the sound driving signal and the number of microswitches opened at that moment is set to three, so that at this moment, a microswitch driving signal with three openings and an opening position corresponding to the negative pulse phase in the corresponding preset cycle is generated; Figure 5 Shown in the dashed box.

[0067] In another example, the target audio signal at some moments is positive and the target audio signal at some moments is negative; if the target audio signal at a certain moment is positive and the amplitude is twice the preset amplitude, then: the opening position of the microswitch at that moment is set at the positive pulse phase in the corresponding preset cycle of the sound driving signal and the number of microswitches opened at that moment is set to two, so that at this moment, a microswitch driving signal with two openings and an opening position corresponding to the positive pulse phase in the corresponding preset cycle is generated; if the target audio signal at a certain moment is negative and the amplitude is twice the preset amplitude, then: the opening position of the microswitch at that moment is set at the negative pulse phase in the corresponding preset cycle of the sound driving signal and the number of microswitches opened at that moment is set to two, so that at this moment, a microswitch driving signal with two openings and an opening position corresponding to the negative pulse phase in the corresponding preset cycle is generated, such as Figure 6 Shown in the dashed box.

[0068] Step S3, controlling the corresponding number of micro switches in the micro switch array to turn on through the corresponding number of micro switch driving signals at different times, so that the corresponding number of sound driving signals pass through the turned-on micro switches respectively and then perform signal superposition, thereby realizing the synthesis and demodulation of the target audio signals at different times.

[0069] For example, at a certain moment, two micro switches in the micro switch array 130 are turned on. At this time, if the opening positions of the two micro switches correspond to the positive pulse phase of the corresponding preset period in the sound driving signal, then after the sound driving signal passes through the two micro switches, two positive pulses are superimposed; if the opening positions of the two micro switches correspond to the negative pulse phase of the corresponding preset period in the sound driving signal, then after the sound driving signal passes through the two micro switches, two negative pulses are superimposed; for another example, at a certain moment, three micro switches in the micro switch array 130 are turned on. At this time, if the opening positions of the three micro switches correspond to the positive pulse phase of the corresponding preset period in the sound driving signal, then after the sound driving signal passes through the three micro switches, three positive pulses are superimposed; if the opening positions of the three micro switches correspond to the negative pulse phase of the corresponding preset period in the sound driving signal, then after the sound driving signal passes through the three micro switches, three negative pulses are superimposed; in this way, the synthesis and demodulation of the target audio signals at different moments are realized. Taking the target audio signal as positive at some moments and negative at some moments as an example, the switch states of each micro switch at different moments are as follows: Figure 7 As shown in the figure, an unfilled square box indicates that the micro switch is in a closed state, and a square box filled with slashes indicates that the micro switch is in an open state.

[0070] In the digital sound generation method of this embodiment, at a certain moment: if the target audio signal requires the superposition of several positive pulses, the microswitch driving signal can be used to control the corresponding number of microswitches to open at the corresponding positive pulse phase in the sound generation drive signal, and control all the microswitches to be closed at the corresponding negative pulse phase in the sound generation drive signal; if the target audio signal requires the superposition of several negative pulses, the microswitch driving signal can be used to control all the microswitches to be closed at the corresponding positive pulse phase in the sound generation drive signal, and control the corresponding number of microswitches to be opened at the corresponding negative pulse phase in the sound generation drive signal, thereby realizing the synthesis and demodulation of the target audio signal at different moments, thereby completing the sound reconstruction. When the target audio signal is synthesized and demodulated in the above manner, only one type of pulse is superimposed at any time, or only positive pulses are superimposed, or only negative pulses are superimposed. There is no situation where the positive and negative pulses cancel each other out. Therefore, the target audio signal finally synthesized and demodulated has a high sound pressure, that is, a high volume. Moreover, digital sound generation can cover lower frequency bands, for example, frequency bands below 1KHz, which is conducive to achieving full-band (i.e., 20Hz to 20,000Hz) sound generation.

[0071] In addition, the digital sound generation method of the present embodiment can also adjust the volume to further increase the sound pressure of the target audio signal. In one example, the volume of the synthesized and demodulated target audio signal is adjusted by controlling the number of micro switches in the micro switch array to change in multiples, so that the volume can be adjusted; wherein, during the entire synthesis and demodulation process of the target audio signal, the multiple change of the number of micro switches turned on at any time is constant. In specific implementation, the micro switch array can be divided into at least two groups, and the number of micro switches turned on in the micro switch array can be controlled to change in multiples by adjusting the number of groups turned on; for example, the micro switch array is divided into four groups, the first group is used to synthesize and demodulate the target audio signal, and the second to fourth groups are used to adjust the volume of the target audio signal. At this time, if two groups are turned on at the same time, it is equivalent to increasing the volume of the target audio signal by 1 times, and if three groups are turned on at the same time, it is equivalent to increasing the volume of the target audio signal by 2 times, wherein the number of micro switches turned on in each turned-on group at the same time is the same; Figure 4 For example, Figure 4 The example shows the case where one group is turned on. If another group is turned on based on this, the number of micro switches turned on at each moment must be multiplied by 2, so it can be regarded as doubling the volume. In another example, the volume of the target audio signal that is finally synthesized and demodulated is adjusted by adjusting the preset amplitude of the sound drive signal, so that the volume can be adjusted. At this time, the micro switch array is not grouped or only one group is turned on, the number of micro switches turned on remains unchanged, and the volume is adjusted by adjusting the preset amplitude; for example, the preset amplitude is adjusted to 2 times the original value. When the number of micro switches turned on at each moment remains unchanged, the amplitude of the target audio signal at each moment is doubled, so it can be regarded as doubling the volume.

[0072] In practical applications, the rising slope of the microswitch drive signal can be designed to be less than or equal to the rising slope of the sound drive signal, and the falling slope of the microswitch drive signal can be designed to be less than or equal to the falling slope of the sound drive signal, so as to reduce the noise emitted by the microswitch when performing a switching action.

[0073] In summary, the digital sounding method and digital sounding device of the present invention, through the cooperation of the sounding power source and the micro switch array, only involves the superposition of one pulse at any time when synthesizing and demodulating the target audio signal, either the superposition of positive pulses or the superposition of negative pulses, and there is no situation where the positive and negative pulses cancel each other, which is conducive to improving the sound pressure of the target audio signal; the present invention has the advantages of high fidelity and high sound pressure sounding in the full frequency band, and the sounding device is small in size. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A digital sounding method, characterized in that: The digital sounding method comprises: Continuously generating a periodic sound driving signal, wherein the sound driving signal has a preset period and a preset amplitude; Acquire a target audio signal, and generate a corresponding number of micro switch driving signals at different times based on the positive and negative values ​​and amplitudes of the target audio signal at different times; 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 times, so that the corresponding number of sound driving signals are superimposed after passing through the opened micro switches respectively, thereby realizing the synthesis and demodulation of the target audio signals at different times.

2. The digital sound generation method according to claim 1, characterized in that: The volume of the synthesized and demodulated target audio signal is adjusted by controlling the number of micro switches in the micro switch array to change in multiples.

3. The digital sound generation method according to claim 1, characterized in that: The volume of the synthesized and demodulated target audio signal is adjusted by adjusting the preset amplitude.

4. The digital sound generation method according to claim 1, characterized in that: The method of generating a corresponding number of micro switch driving signals at different times includes: Based on the positive and negative of the target audio signal at different times, the opening position of the micro switch at different times is set corresponding to the positive pulse phase or negative pulse phase of each preset cycle in the sound driving signal; The number of micro switches opened at different times is set based on the amplitude of the target audio signal at different times and the preset amplitude; Based on the opening positions of the micro switches at different times and the number of micro switches opened at different times, a corresponding number of micro switch driving signals are generated at different times.

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

6. A digital sound generating device, characterized in that: The digital sound generating device comprises: A first sound-generating part and a control part, wherein the first sound-generating part includes a sound-generating power source, a micro-switch array and a chamber; The sound power source is disposed on the first side of the chamber, and is used to continuously generate a periodic sound driving signal, wherein the sound driving signal has a preset period and a preset amplitude; The micro switch array is disposed on the second side of the chamber, and controls a corresponding number of micro switches to be turned on based on a corresponding number of micro switch driving signals at different times, so as to achieve synthesis and demodulation of target audio signals at different times by superimposing a corresponding number of the sound driving signals; The control unit is electrically connected to the micro switch array, and generates a corresponding number of micro switch driving signals at different times based on the positive and negative values ​​and amplitudes of the target audio signals at different times.

7. The digital sound generating device according to claim 6, characterized in that: The control unit is also electrically connected to the sound power source and is used to set the preset period and the preset amplitude.

8. The digital sound generating device according to claim 6 or 7, characterized in that: The control unit sets the opening position of the micro switches at different times at the positive pulse phase or the negative pulse phase of each preset period in the sound driving signal based on the positive and negative of the target audio signal at different times, sets the number of micro switches opened at different times based on the amplitude of the target audio signal at different times and the preset amplitude, and generates a corresponding number of micro switch driving signals at different times based on the opening positions of the micro switches at different times and the number of micro switches opened at different times.

9. The digital sound generating device according to claim 6, characterized in that: The first sound-emitting part is replaced by a second sound-emitting part, which includes a plurality of sound-emitting power sources, a plurality of micro-switches and a plurality of chambers, which correspond to each other one by one; the sound-emitting power source is arranged on a first side of the chamber, and the micro-switch is arranged on a second side of the chamber, wherein a plurality of the micro-switches constitute the micro-switch array.

10. The digital sound generating device according to claim 6 or 9, characterized in that: The sound power source includes an ultrasonic transducer, a piezoelectric sound generator, an electrostatic sound generator or a moving coil sound generator.

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