CN108419172A - Wave beam forming directional microphone - Google Patents
Wave beam forming directional microphone Download PDFInfo
- Publication number
- CN108419172A CN108419172A CN201810080152.5A CN201810080152A CN108419172A CN 108419172 A CN108419172 A CN 108419172A CN 201810080152 A CN201810080152 A CN 201810080152A CN 108419172 A CN108419172 A CN 108419172A
- Authority
- CN
- China
- Prior art keywords
- chip
- wave beam
- beam forming
- power supply
- directional microphone
- 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
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 241000209140 Triticum Species 0.000 claims 1
- 235000021307 Triticum Nutrition 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 230000001629 suppression Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
-
- 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
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L15/00—Speech recognition
- G10L15/20—Speech recognition techniques specially adapted for robustness in adverse environments, e.g. in noise, of stress induced speech
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- General Health & Medical Sciences (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention relates to loud speaker electroacoustic fields, provide a kind of wave beam forming directional microphone.Directive property is formed using beamforming technique, the direction of axle steer sound source will be directed toward, including wave beam forming noise treatment DSP processing chips, the processing chip connects two non-direction microphone DAC inputs, the processing chip is equipped with crystal 4MHz crystal oscillators, the processing chip is additionally provided with reset chip control connection, the processing chip, reset chip is by 3.3V chip power supply module for power supply, the 3.3V chip power supply modules are also connected with 5V power supplies, 5V power supplies also while for operational amplifier chip power supply provide voice signal output, processing chip passes through audio output DAC chip data connection aforementioned opamp chip.Using two microphones without direction, which forms directive property using beamforming technique, because the direction that will be directed toward axle steer sound source, greatly reduces environmental noise.By the function of noise suppression, the fixation noise for remaining in and being directed toward axis direction is further decreased.
Description
Technical field
The present invention relates to loud speaker electroacoustic field, more particularly to a kind of wave beam forming directional microphone.
Background technology
Growing with speech recognition technology, voice entry system is widely used in automobile navigation instrument and intelligent hand
In mobile device headed by machine, from now on, household appliances will be also expanded to.
The design forms directive property using beamforming technique, because of the direction that will be directed toward axle steer sound source, significantly
Reduce environmental noise.By the function of noise suppression, the fixation noise for remaining in and being directed toward axis direction is further decreased.This skill
Art is different with the technology that noise elimination is only used only, and the pickup sound source that can be more clear develops directional microphone scheme,
By using the beamforming technique for using two non-direction microphones, the sound source voice of specific direction is made to be apparent from.
So far, directional microphone can only form directive property by physical arrangement (tubular structure), but to make
Directive property improves, and just will appear becoming large-sized for microphone, and physical arrangement does not change, the problems such as can not controlling directive property
Occur, and using beamforming technique to form directional microphone can solve these problems.
Invention content
The purpose of the present invention provides a kind of wave beam forming directional microphone aiming at the above technical problem, reduces low
Remain in the fixation noise for being directed toward axis direction, improves phonetic recognization rate.
The technical problem of the present invention is mainly addressed by following technical proposals：
A kind of wave beam forming directional microphone forms directive property using beamforming technique, will be directed toward axle steer sound source
Direction, including wave beam forming noise treatment DSP processing chips, which connects two non-direction microphone DAC
Input, the processing chip are equipped with crystal 4MHz crystal oscillators, which is additionally provided with reset chip control connection, the place
Chip, reset chip are managed by 3.3V chip power supply module for power supply, which is also connected with 5V power supplies, which supplies
Electricity also while for operational amplifier chip power supply provides voice signal output, and the processing chip passes through audio output DAC chip
Data connection aforementioned opamp chip.
Preferably, the wave beam forming noise treatment DSP processing chips use BU8332 model DSP processing chips.
Preferably, the reset chip uses BD5231 model reset chips.
Preferably, the 3.3V chip power supplies module uses TLV70033 model 3.3V chip power supply modules.
Preferably, the operational amplifier chip uses BU7261G model operational amplifier chips.
Further, described two non-direction microphone spacing are not more than 10mm.
1. exclusive signal processing technology realizes sharp directive property, carries out the clear of sound compared with previous microphone
Clear degree processing.Sounnd source direction (0 °) more significantly improves the attenuation of back side direction (180 °) with previous microphone
30dB or more.Further, it is also possible to realize 10mm clipping rooms away from.
2. voice can be made not deteriorate, environmental noise can be reduced.Therefore, the speech recognition under ambient noise conditions is improved
Rate.By the detection of our company, precision of identifying speech in the environment of environmental noise class 5 5dBSPL is increased to from 5%
90%.To increase substantially phonetic recognization rate.
3. by using the beamforming technique for using two non-direction microphones, make the sound source voice of specific direction
It is apparent from.
The beneficial effects of the invention are as follows：Using two microphones without direction, which is formed using beamforming technique
Directive property, because the direction that will be directed toward axle steer sound source, greatly reduces environmental noise.By the function of noise suppression,
Further decrease the fixation noise for remaining in and being directed toward axis direction.Moreover, because two can be installed on the thin space of only 10mm
A microphone, so can be built in using smart mobile phone as on the various mini-plants of representative.It is handled by optimization, wave beam is assigned
Shape technology can control processing delay time when using in 10msec or less so that the influence control for other application program
It makes in minimum limit.By these measures, helps to improve the phonetic recognization rate of various equipment and improve hands-free call
Quality.
Description of the drawings
Fig. 1 is inventive microphone control principle drawing；
Fig. 2 is that present invention is generally directed to property microphone working principle figures；
Fig. 3 is specifically to disclose the directional microphone circuit diagram fully provided；
Specific implementation mode
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
In conjunction with a kind of wave beam forming directional microphones of attached drawing 1-2, directive property is formed using beamforming technique, will be directed toward
The direction of axle steer sound source, including wave beam forming noise treatment DSP processing chips, processing chip connection two are non-direction
Microphone DAC inputs, the processing chip are equipped with crystal 4MHz crystal oscillators, which is additionally provided with reset chip control and connects
It connects, by 3.3V chip power supply module for power supply, which is also connected with 5V confessions for the processing chip, reset chip
Electricity, 5V power supplies also while for operational amplifier chip power supply provide voice signal output, and the processing chip is defeated by audio
Go out DAC chip data connection aforementioned opamp chip.
The wave beam forming noise treatment DSP processing chips use BU8332 model DSP processing chips.It is assigned by wave beam soft
Part algorithm realizes wave beam forming noise treatment.
The reset chip uses BD5231 model reset chips.
The 3.3V chip power supplies module uses TLV70033 model 3.3V chip power supply modules.
The operational amplifier chip uses BU7261G model operational amplifier chips.
Described two non-direction microphone spacing are not more than 10mm.
Specifically to disclose fully, the present embodiment also provides attached drawing 3 directional microphone circuit diagram, convenient to carry out.
The present embodiment (1) acumen directive property can more clearly from pick up sound source, using exclusive signal processing technology, with
Previous microphone compares, and realizes sharp directive property, carries out the clarity processing of sound.Sounnd source direction (0 °) is for back side side
More significantly improve 30dB or more with previous microphone to the attenuation of (180 °).Further, it is also possible to realize that 10mm is installed
Spacing.(2) phonetic recognization rate is increased substantially, voice can be made not deteriorate, environmental noise can be reduced.Therefore, it improves in environment
Phonetic recognization rate under noise conditions.By the detection of our company, voice in the environment of environmental noise class 5 5dBSPL is known
Other precision is increased to 90% from 5%.
The present embodiment is the exemplary embodiment of the present invention, for those skilled in the art, in the present invention
On the basis of disclosing application process and principle, it is easy to make various types of improvement or deformation, be not limited solely to the present invention
Structure described in above-mentioned specific implementation mode, therefore previously described mode is preferred embodiment, and it is not restrictive
Meaning, it is every according to equivalence changes made by the present invention with modification, all in the range protection domain of claims of the present invention.
Claims (6)
1. wave beam forming directional microphone, it is characterised in that：Directive property is formed using beamforming technique, axle steer will be directed toward
The direction of sound source, including wave beam forming noise treatment DSP processing chips, the processing chip connect two non-direction microphones
DAC is inputted, which is equipped with crystal 4MHz crystal oscillators, which is additionally provided with reset chip control connection, institute
Processing chip, reset chip are stated by 3.3V chip power supply module for power supply, which is also connected with 5V power supplies, should
5V power supplies also while for operational amplifier chip power supply provide voice signal output, and the processing chip passes through audio output DAC
Chip data connects aforementioned opamp chip.
2. wave beam forming directional microphone according to claim 1, it is characterised in that：The wave beam forming noise treatment
DSP processing chips use BU8332 model DSP processing chips.
3. wave beam forming directional microphone according to claim 1, it is characterised in that：The reset chip uses
BD5231 model reset chips.
4. wave beam forming directional microphone according to claim 1, it is characterised in that：The 3.3V chip power supplies module
Using TLV70033 model 3.3V chip power supply modules.
5. wave beam forming directional microphone according to claim 1, it is characterised in that：The operational amplifier chip is adopted
With BU7261G model operational amplifier chips.
6. wave beam forming directional microphone according to claim 1, it is characterised in that：Described two non-direction wheats
Gram wind spacing is not more than 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810080152.5A CN108419172A (en) | 2018-01-27 | 2018-01-27 | Wave beam forming directional microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810080152.5A CN108419172A (en) | 2018-01-27 | 2018-01-27 | Wave beam forming directional microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108419172A true CN108419172A (en) | 2018-08-17 |
Family
ID=63126443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810080152.5A Pending CN108419172A (en) | 2018-01-27 | 2018-01-27 | Wave beam forming directional microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108419172A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807404A (en) * | 2010-03-04 | 2010-08-18 | 清华大学 | Pretreatment system for strengthening directional voice at front end of electronic cochlear implant |
| CN205249484U (en) * | 2015-12-30 | 2016-05-18 | 临境声学科技江苏有限公司 | Microphone linear array reinforcing directive property adapter |
| JP2016516343A (en) * | 2013-03-13 | 2016-06-02 | コピン コーポレーション | Noise canceling microphone device |
-
2018
- 2018-01-27 CN CN201810080152.5A patent/CN108419172A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807404A (en) * | 2010-03-04 | 2010-08-18 | 清华大学 | Pretreatment system for strengthening directional voice at front end of electronic cochlear implant |
| JP2016516343A (en) * | 2013-03-13 | 2016-06-02 | コピン コーポレーション | Noise canceling microphone device |
| CN205249484U (en) * | 2015-12-30 | 2016-05-18 | 临境声学科技江苏有限公司 | Microphone linear array reinforcing directive property adapter |
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| 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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180817 |