CN117376779A - Volume control method of digital loudspeaker, digital loudspeaker and electronic equipment - Google Patents
Volume control method of digital loudspeaker, digital loudspeaker and electronic equipment Download PDFInfo
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- CN117376779A CN117376779A CN202311500252.6A CN202311500252A CN117376779A CN 117376779 A CN117376779 A CN 117376779A CN 202311500252 A CN202311500252 A CN 202311500252A CN 117376779 A CN117376779 A CN 117376779A
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- 230000009471 action Effects 0.000 claims description 4
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- 230000002349 favourable effect Effects 0.000 abstract description 3
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- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000000275 quality assurance Methods 0.000 description 2
- 230000026683 transduction Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The application relates to a volume control method of a digital loudspeaker, the digital loudspeaker and electronic equipment, and belongs to the technical field of digital loudspeakers, the method is applied to an electrostatic digital loudspeaker, and comprises the steps of determining an electric energy signal loaded on a loudspeaker unit based on a received volume adjustment instruction, wherein any loudspeaker unit comprises a first electrode and a second electrode; based on the electric energy signal, adjusting the sound pulse energy output by the loudspeaker unit to finish volume adjustment; the first voltage signal with fixed pulse waveform is loaded on the first electrode, and the adjustable second voltage signal is loaded on the second electrode based on an amplitude modulation or phase modulation mode, so that the loading of the electric energy signal is realized. The method can obviously improve the consistency of devices and is favorable for realizing the guarantee and improvement of the tone quality of the digital loudspeaker.
Description
Technical Field
The application belongs to the technical field of digital speakers, and particularly relates to a volume control method and device of a digital speaker and electronic equipment.
Background
MEMS (Micro-Electro-Mechanical System) speakers are array sound emitting devices composed of a plurality of pixel speaker units, and unlike the traditional speaker analog sound emitting principle, the sound emission is realized by adopting a digital sound reconstruction mode, which is also called a digital speaker. Based on the different transduction modes, the digital speakers can be classified into three types, i.e., electric type, electrostatic type and piezoelectric type. In the related art of digital speakers, how to control the sound volume of the digital speakers without reducing the sound quality is a hot subject of current research.
In the related art, the volume control of the digital speaker (as described in the prior patent CN114598969a, "a method, apparatus, device and medium for volume control of digital speaker") is to perform volume adjustment based on the amplitude signal or the time signal of the power applied to the speaker unit, and in practice, for the digital speaker with electrostatic transduction, one electrode (such as a driving board) is grounded, and the other electrode (such as a diaphragm) is loaded with a pulse voltage, so as to implement volume adjustment by changing the amplitude or duty ratio of the pulse voltage.
The digital loudspeaker is an array sounding device formed by a plurality of pixel loudspeaker units, and consistency of regulation and control of each unit is an important factor affecting the sound quality of digital sounding. In the scheme of controlling volume based on pulse voltage waveform adopted by the existing electrostatic digital loudspeaker, the single pulse period is only 10us, extremely high control frequency and response time are required in the implementation, the actual control precision can influence the consistency of the sound producing unit, and the capacitance, inductance and other devices of the circuit in waveform control can cause the change of the circuit electrical signal to have rising edge and falling edge, in other words, the rising edge and the falling edge in the mode can influence the volume control precision of the digital loudspeaker, in other words, the existing volume control implementation scheme aiming at the electrostatic digital loudspeaker has factors which are unfavorable for the consistency of the digital sound producing unit and influence the sound quality assurance and the improvement of the digital loudspeaker.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
In order to overcome the problems existing in the related art to at least a certain extent, the application provides a volume control method of a digital loudspeaker, the digital loudspeaker and electronic equipment, and solves the problem that the consistency of a sound generating unit is affected by a volume control implementation scheme in the prior art, so that the quality of the digital loudspeaker is guaranteed and improved.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect of the present invention,
the application provides a volume control method of a digital loudspeaker, which is applied to an electrostatic digital loudspeaker and comprises the following steps:
determining an electric energy signal loaded to a speaker unit based on a received volume adjustment instruction, wherein any speaker unit comprises a first electrode and a second electrode;
based on the electric energy signal, adjusting the sound pulse energy output by the loudspeaker unit to finish volume adjustment;
and loading a first voltage signal with a fixed pulse waveform on the first electrode, and loading an adjustable second voltage signal on the second electrode based on an amplitude modulation or phase modulation mode to realize the loading of the electric energy signal.
Optionally, when the electric energy signal is an electric energy acting time signal, the second voltage signal is a fixed pulse waveform signal with an adjustable phase relative to the first voltage signal, and loading of the electric energy acting time signal is achieved based on a phase modulation mode.
Optionally, the first voltage signal and the second voltage signal are both rectangular pulse signals.
Optionally, the first voltage signal and the second voltage signal are rectangular pulse signals with fixed duty cycle.
Optionally, the waveform phase of the second voltage signal is controlled based on a manner in which a delay is provided in the second electrode circuit.
Optionally, when the electric energy signal is a voltage amplitude signal, the second voltage signal is a direct current voltage signal with adjustable amplitude, and loading of the voltage amplitude signal is achieved based on an amplitude modulation mode.
Optionally, the first voltage signal is a rectangular pulse signal, and a high level of the rectangular pulse signal is a first preset value;
the upper limit of the amplitude adjustment of the second voltage signal is a second preset value, and the second preset value is smaller than or equal to the first preset value.
Optionally, the first electrode is a driving plate, and the second electrode is a vibrating diaphragm;
or, the first electrode is a vibrating diaphragm, and the second electrode is a driving plate.
In a second aspect of the present invention,
the application provides a digital loudspeaker, which realizes volume control based on the volume control method.
In a third aspect of the present invention,
the application provides electronic equipment, wherein at least one digital loudspeaker is arranged in the electronic equipment.
The application adopts the technical scheme, possesses following beneficial effect at least:
the technical scheme is applied to the electrostatic digital loudspeaker, determines an electric energy signal loaded on the loudspeaker unit based on a received volume adjustment instruction, adjusts the sound pulse energy output by the loudspeaker unit based on the electric energy signal, and completes volume adjustment; the first voltage signal with fixed pulse waveform is loaded on the first electrode, and the adjustable second voltage signal is loaded on the second electrode based on an amplitude modulation or phase modulation mode, so that the loading of the electric energy signal is realized. In the volume control implementation in this application, fixed pulse waveform on the first electrode cooperates with the adjustable signal of electricity loaded on the second electrode based on amplitude modulation or phase modulation mode, realizes the loading of electric energy signal, and wherein fixed pulse waveform does not participate in volume control, and pulse circuit is simple, can make the device uniformity improve by a wide margin, is favorable to realizing the assurance and the promotion of digital loudspeaker tone quality.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the technical aspects or prior art of the present application and constitute a part of this specification. The drawings, which are used to illustrate the technical solution of the present application, together with the embodiments of the present application, but do not limit the technical solution of the present application.
Fig. 1 is a flow chart of a volume control method of a digital speaker according to an embodiment of the present application;
FIG. 2 is a schematic illustration of loading of a voltage amplitude signal based on amplitude modulation in one embodiment of the present application;
FIG. 3 is a schematic illustration of loading of a phase modulation based power on time signal in one embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the examples herein, which are within the scope of the protection sought by those of ordinary skill in the art without undue effort, are intended to be encompassed by the present application.
As described in the background art, the digital speaker is an array sound emitting device composed of a plurality of pixel speaker units, and consistency of adjustment and control of each unit is an important factor affecting sound quality of digital sound emission. In the scheme of controlling volume based on pulse voltage waveform adopted by the existing electrostatic digital loudspeaker, the single pulse period is only 10us, extremely high control frequency and response time are required in the implementation, the actual control precision can influence the consistency of the sound producing unit, and the capacitance, inductance and other devices of the circuit in waveform control can cause the change of the circuit electrical signal to have rising edge and falling edge, in other words, the rising edge and the falling edge in the mode can influence the volume control precision of the digital loudspeaker, in other words, the existing volume control implementation scheme aiming at the electrostatic digital loudspeaker has factors which are unfavorable for the consistency of the digital sound producing unit and influence the sound quality assurance and the improvement of the digital loudspeaker.
In view of this, the application provides a volume control method of a digital speaker, so as to solve the problem that the volume control implementation scheme of an electrostatic digital speaker in the prior art affects the consistency of a sound generating unit.
In an embodiment, as shown in fig. 1, a volume control method of a digital speaker provided in the present application is applied to an electrostatic digital speaker, and the volume control method includes:
step S110, determining an electrical energy signal loaded on the speaker unit based on the received volume adjustment instruction, wherein in this embodiment, any speaker unit of the electrostatic digital speaker includes a first electrode and a second electrode;
step S120, based on the electric energy signal, adjusting the sound pulse energy output by the loudspeaker unit to finish volume adjustment;
the first voltage signal with fixed pulse waveform is loaded on the first electrode, and the adjustable second voltage signal is loaded on the second electrode based on an amplitude modulation or phase modulation mode, so that the loading of the electric energy signal is realized.
As will be readily understood, as an electrostatic digital speaker, a speaker unit thereof generally employs a driving plate+an electrode structure of a diaphragm; correspondingly, in the application of the technical scheme, the first electrode can be a driving plate, the second electrode is a vibrating diaphragm, or the first electrode is a vibrating diaphragm, and the second electrode is a driving plate.
In the above process, the framework principles of how to implement the adjustment of the acoustic pulse energy and the implementation of the volume control based on the electric energy signal are described in the related prior patent, and are not repeated herein.
The volume control scheme aims at the consistency problem existing in the volume control of the existing electrostatic digital loudspeaker, is different from the prior art, and in the technical scheme of the application, a first voltage signal with a fixed pulse waveform is loaded on a first electrode, and an adjustable second voltage signal is loaded on a second electrode based on an amplitude modulation or phase modulation mode, so that the loading of an electric energy signal is realized. The fixed pulse waveform on the first electrode is matched with the adjustable electric signal loaded on the second electrode based on the amplitude modulation or phase modulation mode to realize the loading of the electric energy signal, wherein the fixed pulse waveform does not participate in the volume control, the pulse circuit is simple, the consistency of devices can be obviously improved, and the method is favorable for realizing the guarantee and the improvement of the sound quality of the digital loudspeaker.
In a specific implementation scenario, the electric energy signal is a voltage amplitude signal, the second voltage signal is a direct-current voltage signal with adjustable amplitude, and loading of the voltage amplitude signal is realized based on an amplitude modulation mode;
as shown in fig. 2, the left-hand illustration in fig. 2 is a first voltage signal, the middle illustration in fig. 2 is a second voltage signal, and the right-hand illustration in fig. 2 is a voltage amplitude signal implemented by matching the first voltage signal with the second voltage signal;
it is easy to understand that the second voltage signal is a variable direct current voltage, and in the technical scene of the application, compared with the prior art, the second voltage signal is a steady-state voltage, and the device does not need rapid frequency response, has simple circuit, and is beneficial to ensuring consistency.
Further, as a preferable example, as shown in fig. 2, the first voltage signal is a rectangular pulse signal, and the high level of the rectangular pulse signal is a first preset value, where the first preset value is generally 100V at the most;
the upper limit of the amplitude adjustment of the second voltage signal is a second preset value, and the second preset value is smaller than or equal to the first preset value so as to prevent the complex overturning condition of the voltage amplitude signal realized by matching the first voltage signal and the second voltage signal, thereby reducing the complexity of the related control circuit and being beneficial to ensuring the consistency.
In a specific implementation scenario, when the electric energy signal is an electric energy action time signal, the second voltage signal is a fixed pulse waveform signal with an adjustable phase relative to the first voltage signal, and loading of the electric energy action time signal is realized based on a phase modulation mode;
as shown in fig. 3, the left-hand illustration in fig. 3 is a first voltage signal, the middle illustration in fig. 3 is a second voltage signal, and the right-hand illustration in fig. 3 is a time signal for the electric energy to be applied by the first voltage signal and the second voltage signal in cooperation;
in practical implementation, the waveform phase of the second voltage signal can be controlled by setting a delay device in the second electrode circuit (namely, a circuit for generating the second voltage signal), so as to realize phase modulation;
specifically, as a specific implementation mode, the first voltage signal and the second voltage signal are rectangular pulse signals, and the mode can further ensure that related pulse circuits are simple, thereby being beneficial to ensuring the consistency of devices;
as mentioned above, the capacitance, inductance, etc. in the waveform control circuit may cause the circuit electrical signal to change, and the rising edge and the falling edge may affect the volume control accuracy of the digital speaker, for this, further, the first voltage signal and the second voltage signal are rectangular pulse signals with fixed duty ratios, for example, the duty ratio of the pulse signals may be preferably in the range of 0.3 to 0.7, so as to further ensure the implemented control accuracy.
In addition, it should be noted that the sound emission control principle of the digital speaker is based on the digital sound reconstruction technology (Digital Sound Reconstruction, DSR), so that in the present application, the first voltage signal is a digital pulse signal including DSR control (i.e. the pulse waveform thereof is discrete in overall time sequence to carry DSR control information), and the second voltage signal is a reference signal, and the second voltage signal is used for volume control as a whole.
In an embodiment, the present application further provides a digital speaker, where the digital speaker implements volume control based on the volume control method described above.
In an embodiment, the present application further provides an electronic device, where at least one digital speaker is configured.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A volume control method of a digital speaker, applied to an electrostatic digital speaker, comprising:
determining an electric energy signal loaded to a speaker unit based on a received volume adjustment instruction, wherein any speaker unit comprises a first electrode and a second electrode;
based on the electric energy signal, adjusting the sound pulse energy output by the loudspeaker unit to finish volume adjustment;
and loading a first voltage signal with a fixed pulse waveform on the first electrode, and loading an adjustable second voltage signal on the second electrode based on an amplitude modulation or phase modulation mode to realize the loading of the electric energy signal.
2. The volume control method according to claim 1, wherein when the power signal is a power action time signal, the second voltage signal is a fixed pulse waveform signal with an adjustable phase relative to the first voltage signal, and loading of the power action time signal is achieved based on a phase modulation manner.
3. The volume control method of claim 2, wherein the first voltage signal and the second voltage signal are both rectangular pulse signals.
4. A volume control method according to claim 3, wherein the first voltage signal and the second voltage signal are rectangular pulse signals of fixed duty cycle.
5. The sound volume control method according to claim 2, wherein the waveform phase of the second voltage signal is controlled based on a manner in which a delay is provided in the second electrode circuit.
6. The volume control method according to claim 1, wherein when the electric energy signal is a voltage amplitude signal, the second voltage signal is a direct current voltage signal with adjustable amplitude, and loading of the voltage amplitude signal is achieved based on an amplitude modulation mode.
7. The method according to claim 6, wherein the first voltage signal is a rectangular pulse signal, and a high level of the rectangular pulse signal is a first preset value;
the upper limit of the amplitude adjustment of the second voltage signal is a second preset value, and the second preset value is smaller than or equal to the first preset value.
8. The volume control method of claim 1, wherein the first electrode is a drive plate and the second electrode is a diaphragm;
or, the first electrode is a vibrating diaphragm, and the second electrode is a driving plate.
9. A digital speaker, characterized in that the digital speaker realizes volume control based on the volume control method according to any one of claims 1 to 8.
10. An electronic device, characterized in that at least one digital loudspeaker as claimed in claim 9 is arranged in the electronic device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311500252.6A CN117376779B (en) | 2023-11-13 | 2023-11-13 | Volume control method of digital loudspeaker, digital loudspeaker and electronic equipment |
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| CN202311500252.6A CN117376779B (en) | 2023-11-13 | 2023-11-13 | Volume control method of digital loudspeaker, digital loudspeaker and electronic equipment |
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| CN117376779A true CN117376779A (en) | 2024-01-09 |
| CN117376779B CN117376779B (en) | 2024-03-22 |
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| US20030044029A1 (en) * | 2001-08-17 | 2003-03-06 | Gabriel Kaigham J. | Method and apparatus for reconstruction of soundwaves from digital signals |
| KR20080040834A (en) * | 2006-11-06 | 2008-05-09 | 양길섭 | Multiple arrayed electrostatic loudspeakers |
| JP2008118247A (en) * | 2006-11-01 | 2008-05-22 | Seiko Epson Corp | Electrostatic type ultrasonic transducer and ultrasonic speaker using the same, method of reproducing sound signal, super-directivity sound system, and display device |
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| CN105681989A (en) * | 2016-02-26 | 2016-06-15 | 无锡吉仓纳米材料科技有限公司 | Composite diaphragm electrostatic loudspeaker of ultrathin graphite film and carbon tube film |
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| CN115052230A (en) * | 2022-05-27 | 2022-09-13 | 地球山(苏州)微电子科技有限公司 | Sound orientation method, device and equipment based on digital sound production chip |
| CN115668979A (en) * | 2020-05-18 | 2023-01-31 | 波音频有限公司 | Control of an electrostatic acoustic device |
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2023
- 2023-11-13 CN CN202311500252.6A patent/CN117376779B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030044029A1 (en) * | 2001-08-17 | 2003-03-06 | Gabriel Kaigham J. | Method and apparatus for reconstruction of soundwaves from digital signals |
| JP2008118247A (en) * | 2006-11-01 | 2008-05-22 | Seiko Epson Corp | Electrostatic type ultrasonic transducer and ultrasonic speaker using the same, method of reproducing sound signal, super-directivity sound system, and display device |
| KR20080040834A (en) * | 2006-11-06 | 2008-05-09 | 양길섭 | Multiple arrayed electrostatic loudspeakers |
| CN104967948A (en) * | 2015-06-16 | 2015-10-07 | 苏州上声无线音频传输系统研究院有限公司 | Method and apparatus for driving digital loudspeaker based on amplitude modulation and phase modulation |
| CN105681989A (en) * | 2016-02-26 | 2016-06-15 | 无锡吉仓纳米材料科技有限公司 | Composite diaphragm electrostatic loudspeaker of ultrathin graphite film and carbon tube film |
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| CN117376779B (en) | 2024-03-22 |
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