CN112261563A - Mems digital loudspeaker system and working method thereof - Google Patents
Mems digital loudspeaker system and working method thereof Download PDFInfo
- Publication number
- CN112261563A CN112261563A CN202011136154.5A CN202011136154A CN112261563A CN 112261563 A CN112261563 A CN 112261563A CN 202011136154 A CN202011136154 A CN 202011136154A CN 112261563 A CN112261563 A CN 112261563A
- Authority
- CN
- China
- Prior art keywords
- output
- unit
- digital
- mems
- dsp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/02—Loudspeakers
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The invention discloses a mems digital speaker system and a working method thereof, comprising a DSP unit, a switch circuit, a driving unit and a mems speaker array unit; the DSP unit is provided with digital audio signal and analog audio signal input ports and 8 digital signal output ports; the switch circuit and the driving unit are composed of 8 independent driving units; the mems loudspeaker array unit consists of 255 array elements. The invention generates very strong sound with directivity by the DSP unit, the 8 driving units and the mems loudspeaker array, and can effectively reduce the distortion of the sound, the DSP has a digital signal processing algorithm for audio frequency to eliminate harmonic interference, and each driving unit is provided with a corresponding matching circuit to adjust sound pressure, thereby reducing the distortion of the sound, and realizing the directional propagation process of the sound by means of the high directivity of the ultrasonic wave.
Description
Technical Field
The invention relates to the technical field of loudspeaker systems, in particular to a mems digital loudspeaker system and a working method thereof.
Background
The speaker is an electroacoustic transducer, and with the development of technology, the mems speaker is gradually applied to electronic products, and mems is an abbreviation of Micro-Electro-Mechanical System, i.e. Micro Electro-Mechanical System. The mems loudspeaker has the advantages of low power consumption, small size, small volume, good consistency and the like, and is a development direction in the field of loudspeakers.
The loudspeakers on the moving iron market at present are usually moving coil loudspeaker type loudspeakers, piezoelectric loudspeakers and electrostatic loudspeakers. However, since the radiation sound pressure of the mems speaker is reduced compared to the radiation sound pressure of the conventional speaker, the radiation sound pressure sensitivity of the conventional mems speaker cannot fully satisfy the practical requirement. In addition, on the one hand, the privacy of the traditional loudspeaker is poor in the using process due to the problems of large sound and poor directivity of the traditional loudspeaker.
Disclosure of Invention
The invention aims to provide a mems digital loudspeaker system and a working method thereof, which are different from the traditional loudspeaker, the adopted mems loudspeaker is composed of 255 array elements, each array element has a fixed 44.1Khz resonant frequency, is equivalent to an ultrasonic sensor, can directly convert audio digital signals into sound, does not need digital-to-analog conversion, can generate very strong sound beams with directivity and broadband audibility similar to a spotlight light beam, and realizes sound directional propagation so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a mems digital speaker system includes a DSP unit, a switching circuit and driving unit, and a mems speaker array unit;
the DSP unit is provided with digital audio signal and analog audio signal input ports and 8 digital signal output ports; the analog audio signal is converted into a digital signal by the DSP through the analog audio signal input port, the digital audio signal is received by the DSP through the digital audio signal input port, and the digital signal is modulated and processed by an algorithm through the DSP;
the switch circuit and the drive unit are composed of 8 independent drive units, the enable N1 of the drive unit 1 is controlled by the Output of Output1, the enable N2 of the drive unit 2 is controlled by the Output of Output2, the enable N3 of the drive unit 3 is controlled by the Output of Output3, the enable N4 of the drive unit 4 is controlled by the Output of Output4, the enable N5 of the drive unit 5 is controlled by the Output of Output5, the enable N6 of the drive unit 6 is controlled by the Output of Output6, the enable N7 of the drive unit 7 is controlled by the Output of Output7, and the enable N8 of the drive unit 8 is controlled by the Output of Output 8; each driving unit is provided with an output matching circuit which is matched with the mems loudspeaker array unit;
the mems loudspeaker array unit consists of 255 array elements, wherein the 255 array elements are divided into 8 groups, and the number of the array elements in each group is 2 degrees and 2 degrees respectively1，22，23，24，25，26，27(ii) a The resonant frequency of each array element is 44.1Khz, the working frequency is fixed 44.1Khz, and each array element works to emit ultrasonic waves with directivity.
Furthermore, the audio signal adopts 8 bits, from the most significant bit to the least significant bit, the corresponding I/O pins are Output8 to Output1 in sequence, and the 8I/os generate corresponding high-low level changes according to the high-low level change of each bit of the audio digital signal, thereby controlling the operation of the switch circuit in each driving unit.
Further, 8 independent driving units 1 to 8 output sine waves having a fixed frequency of 44.1Khz, the output is controlled by an enable terminal, if the enable terminal is at a high level, the sine waves of 44.1Khz for one period are output, and the sampling frequency for the audio signals is 44.1Khz, which is consistent with the operating frequency of the mems speaker array unit.
The invention provides another technical scheme: a method of operating a mems digital loudspeaker system, comprising the steps of:
s1: analog audio signals are converted into 8-bit digital signals through DSP A/D, and the digital audio signals directly enter DSP algorithm for modulation;
s2: the modulated 8-bit digital signal is output through 8I/O of the DSP unit, 8I/O respectively corresponds to each bit of the 8-bit digital signal, and the 8I/O output high level or low level is correspondingly changed according to binary change of each bit of the digital signal;
s3: enabling or disabling the 8 independent driving units according to the output level, outputting a sine wave with a period of 44.1khz to drive corresponding mems 8 array tuples once each driving unit is enabled, and not outputting the sine wave if the driving unit is not enabled;
s4: the DSP sequentially outputs 8-bit digital audio signals at a frequency of 44.1khz, and reconstructs the digital sound by recycling through S1-S3.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a mems digital loudspeaker system and a working method thereof, which generate very strong sound with directivity and can effectively reduce the distortion of the sound through a DSP unit, 8 driving units and a mems loudspeaker array which are arranged for processing digital signals and outputting the digital signals.
Drawings
FIG. 1 is a system diagram of the present invention;
fig. 2 is a diagram of a mems speaker array of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in the embodiment of the present invention: a mems digital speaker system includes a DSP unit, a switching circuit and driving unit, and a mems speaker array unit.
The DSP unit is provided with digital audio signal and analog audio signal input ports and 8 digital signal output ports; the analog audio signal is converted into a digital signal by the DSP through the analog audio signal input port, the digital audio signal is received by the DSP through the digital audio signal input port, and the DSP modulates the digital signal and performs algorithm processing to reduce harmonic interference output by the loudspeaker.
The switch circuit and the drive unit are composed of 8 independent drive units, the enable N1 of the drive unit 1 is controlled by the Output of Output1, the enable N2 of the drive unit 2 is controlled by the Output of Output2, the enable N3 of the drive unit 3 is controlled by the Output of Output3, the enable N4 of the drive unit 4 is controlled by the Output of Output4, the enable N5 of the drive unit 5 is controlled by the Output of Output5, the enable N6 of the drive unit 6 is controlled by the Output of Output6, the enable N7 of the drive unit 7 is controlled by the Output of Output7, and the enable N8 of the drive unit 8 is controlled by the Output of Output 8; each driving unit is provided with an output matching circuit which is matched with the mems loudspeaker array unit.
Referring to fig. 2, the mems speaker array unit is composed of 255 array elements, the 255 array elements are divided into 8 groups, and the number of the array elements in each group is 2 ° and 2 ° respectively1，22，23，24，25，26，27(ii) a The resonant frequency of each array element is 44.1Khz, the working frequency is fixed 44.1Khz, and each array element works to emit ultrasonic waves with directivity.
In the above embodiment, the audio signal adopts 8 bits, from the most significant bit to the least significant bit, the corresponding I/O pins are Output8 to Output1 in sequence, and the 8I/os generate corresponding high-low level changes according to the high-low level change of each bit of the audio digital signal, thereby controlling the operation of the switch circuit in each driving unit.
In the above embodiment, the 8 independent driving units 1 to 8 output sine waves having a fixed frequency of 44.1Khz, the output is controlled by the enable terminal, and if the enable terminal is at a high level, the sine waves of 44.1Khz for one cycle are output, and the sampling frequency for the audio signal is 44.1Khz, which coincides with the operating frequency of the mems speaker array unit.
To further better explain the present invention, there is also provided an operating method of the mems digital speaker system, comprising the steps of:
the first step is as follows: analog audio signals are converted into 8-bit digital signals through DSP A/D, and the digital audio signals directly enter DSP algorithm for modulation;
the second step is that: the modulated 8-bit digital signal is output through 8I/O of the DSP unit, 8I/O respectively corresponds to each bit of the 8-bit digital signal, and the 8I/O output high level or low level is correspondingly changed according to binary change of each bit of the digital signal;
the third step: enabling or disabling the 8 independent driving units according to the output level, outputting a sine wave with a period of 44.1khz to drive corresponding mems 8 array tuples once each driving unit is enabled, and not outputting the sine wave if the driving unit is not enabled;
the fourth step: the DSP sequentially outputs 8-bit digital audio signals at a frequency of 44.1khz, which are recycled through steps one-three to reconstruct the digital sound.
The working principle is as follows: the invention provides a mems digital loudspeaker system and a working method thereof, wherein the number of array elements of the mems in a mems loudspeaker array unit is used for corresponding to each bit of 8-bit digital audio, thereby realizing digital sound reconstruction, the working frequency of each array element in the mems is consistent and is more than 20Khz, and the ultrasonic wave is in the self-demodulation effect of nonlinear propagation in the air, thus realizing the directional propagation process of the sound by means of the high directivity of the ultrasonic wave.
In summary, the following steps: the invention provides a mems digital speaker system and a working method thereof, which generate very strong sound with directivity and can effectively reduce the distortion of the sound through a DSP unit, 8 driving units and a mems speaker array which are arranged for processing digital signals and outputting the digital signals.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (4)
1. A mems digital speaker system, comprising a DSP unit, a switching circuit and driving unit, and a mems speaker array unit;
the DSP unit is provided with digital audio signal and analog audio signal input ports and 8 digital signal output ports; the analog audio signal is converted into a digital signal by the DSP through the analog audio signal input port, the digital audio signal is received by the DSP through the digital audio signal input port, and the digital signal is modulated and processed by an algorithm through the DSP;
the switch circuit and the drive unit are composed of 8 independent drive units, the enable N1 of the drive unit 1 is controlled by the Output of Output1, the enable N2 of the drive unit 2 is controlled by the Output of Output2, the enable N3 of the drive unit 3 is controlled by the Output of Output3, the enable N4 of the drive unit 4 is controlled by the Output of Output4, the enable N5 of the drive unit 5 is controlled by the Output of Output5, the enable N6 of the drive unit 6 is controlled by the Output of Output6, the enable N7 of the drive unit 7 is controlled by the Output of Output7, and the enable N8 of the drive unit 8 is controlled by the Output of Output 8; each driving unit is provided with an output matching circuit which is matched with the mems loudspeaker array unit;
the mems loudspeaker array unit consists of 255 array elements, wherein the 255 array elements are divided into 8 groups, and the number of the array elements in each group is 2 degrees and 2 degrees respectively1，22，23，24，25，26，27(ii) a The resonant frequency of each array element is 44.1Khz, the working frequency is fixed 44.1Khz, and each array element works to emit ultrasonic waves with directivity.
2. A mems digital loudspeaker system as in claim 1 wherein: the audio signal adopts 8 bits, from the most significant bit to the least significant bit, the corresponding I/O pins are Output8 to Output1 in sequence, and the 8I/Os generate corresponding high-low level changes according to the high-low level changes of each bit of the audio digital signal, so that the switch circuit in each drive unit is controlled to work.
3. A mems digital speaker system and method of operating the same as recited in claim 1, wherein: the 8 independent driving units 1 to 8 output sine waves with a fixed frequency of 44.1Khz, the output is controlled by an enable terminal, if the enable terminal is at a high level, the sine waves with 44.1Khz of one period are output, and the sampling frequency for audio signals is 44.1Khz and is consistent with the working frequency of the mems loudspeaker array unit.
4. A method of operating a mems digital loudspeaker system as defined in claim 1 including the steps of:
s1: analog audio signals are converted into 8-bit digital signals through DSP A/D, and the digital audio signals directly enter DSP algorithm for modulation;
s2: the modulated 8-bit digital signal is output through 8I/O of the DSP unit, 8I/O respectively corresponds to each bit of the 8-bit digital signal, and the 8I/O output high level or low level is correspondingly changed according to binary change of each bit of the digital signal;
s3: enabling or disabling the 8 independent driving units according to the output level, outputting a sine wave with a period of 44.1khz to drive corresponding mems 8 array tuples once each driving unit is enabled, and not outputting the sine wave if the driving unit is not enabled;
s4: the DSP sequentially outputs 8-bit digital audio signals at a frequency of 44.1khz, and reconstructs the digital sound by recycling through S1-S3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011136154.5A CN112261563A (en) | 2020-10-22 | 2020-10-22 | Mems digital loudspeaker system and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011136154.5A CN112261563A (en) | 2020-10-22 | 2020-10-22 | Mems digital loudspeaker system and working method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112261563A true CN112261563A (en) | 2021-01-22 |
Family
ID=74263893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011136154.5A Pending CN112261563A (en) | 2020-10-22 | 2020-10-22 | Mems digital loudspeaker system and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112261563A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070046396A1 (en) * | 2005-08-03 | 2007-03-01 | Yongli Huang | Mems acoustic filter and fabrication of the same |
| CN101203062A (en) * | 2007-07-20 | 2008-06-18 | 徐利梅 | Method for numeral sound signal processing and digital type sound frequency directional loudspeaker |
| CN101583064A (en) * | 2009-06-26 | 2009-11-18 | 电子科技大学 | Micro audio directional loudspeaker with three dimension soundeffect |
| CN101558659B (en) * | 2006-05-22 | 2013-02-13 | 奥迪欧彼塞尔斯有限公司 | Volume and tone control in direct digital speakers |
| CN110099343A (en) * | 2019-05-28 | 2019-08-06 | 安徽奥飞声学科技有限公司 | A kind of earpiece and communication device with MEMS loudspeaker array |
-
2020
- 2020-10-22 CN CN202011136154.5A patent/CN112261563A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070046396A1 (en) * | 2005-08-03 | 2007-03-01 | Yongli Huang | Mems acoustic filter and fabrication of the same |
| CN101558659B (en) * | 2006-05-22 | 2013-02-13 | 奥迪欧彼塞尔斯有限公司 | Volume and tone control in direct digital speakers |
| CN101203062A (en) * | 2007-07-20 | 2008-06-18 | 徐利梅 | Method for numeral sound signal processing and digital type sound frequency directional loudspeaker |
| CN101583064A (en) * | 2009-06-26 | 2009-11-18 | 电子科技大学 | Micro audio directional loudspeaker with three dimension soundeffect |
| CN110099343A (en) * | 2019-05-28 | 2019-08-06 | 安徽奥飞声学科技有限公司 | A kind of earpiece and communication device with MEMS loudspeaker array |
Non-Patent Citations (1)
| Title |
|---|
| 约翰·尔格: "《扬声器与音箱设计手册》", 31 December 2008 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kite et al. | Parametric array in air: Distortion reduction by preprocessing | |
| CN101790118A (en) | Audio-frequency directional loudspeaker system and signal processing method thereof | |
| KR970707648A (en) | A directional acoustic signal processor and method therefor | |
| CN110784799B (en) | Sound directional transmission method and system | |
| CN204031425U (en) | Active directional loudspeaker | |
| CN101583064A (en) | Micro audio directional loudspeaker with three dimension soundeffect | |
| WO2002043437A8 (en) | Wave field synthesys sound reproduction system using a distributed mode panel | |
| CN104380698A (en) | Verbal system, and switching method and device which are applied to verbal system | |
| CN104053093A (en) | Portable indoor noise reduction device | |
| CN111818422A (en) | Fixed-point sound wave transmitting device based on parametric array principle | |
| CN111816155A (en) | Expandable and wave beam controllable directional sound wave transmitting device | |
| CN112218220A (en) | Micro loudspeaker based on MEMS ultrasonic transducer | |
| CN112261563A (en) | Mems digital loudspeaker system and working method thereof | |
| JP2002354575A (en) | Parametric multiway speaker system based on ultrasonic wave | |
| CN209897254U (en) | Parameter burst sounding system | |
| CN103167376A (en) | Directional loudspeaker and signal processing method thereof | |
| CN112601155A (en) | Method and system for digital parametric array loudspeaker | |
| CN112637731A (en) | Full digital audio frequency directional system based on PCM coding and bit group switch control | |
| CN1519059A (en) | Equipment and method for generating directional sound wave | |
| CN106887223A (en) | A kind of musical instrument loudspeaker remote intelligent control system | |
| Sakai et al. | Dynamic single sideband modulation for realizing parametric loudspeaker | |
| US20240040314A1 (en) | Vibration and audio output device and electronic equipment | |
| WO2019047860A1 (en) | Acoustic wave touch device and terminal | |
| CN220858326U (en) | High-quality sounding loudspeaker box | |
| Bhorge et al. | Unidirectional Parametric Speaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210122 |
|
| RJ01 | Rejection of invention patent application after publication |