CN108540888A - A kind of improved earphone noise reduction system and its noise-reduction method - Google Patents
A kind of improved earphone noise reduction system and its noise-reduction method Download PDFInfo
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- CN108540888A CN108540888A CN201810511153.0A CN201810511153A CN108540888A CN 108540888 A CN108540888 A CN 108540888A CN 201810511153 A CN201810511153 A CN 201810511153A CN 108540888 A CN108540888 A CN 108540888A
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- noise
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- resistance
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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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
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
Abstract
The invention discloses a kind of improved earphone noise reduction systems, including noise Rx module, for detecting outside noise signal；Noise filtering module, for being filtered to noise signal；Noise analysis module sends out control signal for analyzing noise signal, and to noise suppression module；Noise suppression module, for sending out the inhibition signal for inhibiting noise.The present invention can improve the deficiencies in the prior art, simplify the operand of noise reduction process.
Description
Technical field
The present invention relates to audio signal processing technique field, especially a kind of improved earphone noise reduction system and its noise-reduction method.
Background technology
With the development of audio signal processing technique, noise cancelling headphone becomes product popular in recent years.The principle of noise cancelling headphone
It is that active noise reduction processing is carried out to outside noise by sending out the inhibition signal for offsetting outside noise.Existing noise reduction side
Although method can obtain preferable noise reduction, its inhibition signal complexity used, operand are big, high to hardware requirement,
Cause the cost of noise cancelling headphone high.
Invention content
The technical problem to be solved in the present invention is to provide a kind of improved earphone noise reduction system and its noise-reduction methods, can solve
Certainly the deficiencies in the prior art simplify the operand of noise reduction process.
In order to solve the above technical problems, the technical solution used in the present invention is as follows.
A kind of improved earphone noise reduction system, including,
Noise Rx module, for detecting outside noise signal；
Noise filtering module, for being filtered to noise signal；
Noise analysis module sends out control signal for analyzing noise signal, and to noise suppression module；
Noise suppression module, for sending out the inhibition signal for inhibiting noise.
Preferably, the input terminal of the noise filtering module passes through concatenated first capacitance and the second capacitance connection to
The normal phase input end of one amplifier passes through concatenated first resistor, zener diode and third between the first capacitance and the second capacitance
Capacity earth is connected to the output end of the first amplifier, the first amplifier by second resistance between first resistor and zener diode
Positive input the collector of the first triode is connected to by 3rd resistor, the positive input of the first amplifier passes through series connection
The 4th resistance and the 4th capacitance connection to the first triode base stage, the emitter of the first triode connect by the 5th capacitance
Ground, the positive input of the first amplifier are connected to the collector of the second triode by the 5th resistance, and the forward direction of the first amplifier is defeated
Enter the base stage that end is connected to the second triode by concatenated 4th resistance and the 6th resistance, the emitter of the second triode passes through
7th resistance eutral grounding, for the inverting input of the first amplifier by the 8th resistance eutral grounding, the inverting input of the first amplifier passes through
Nine resistance are connected to the output end of the first amplifier, the output end of the output end of the first amplifier as noise filtering module.
Preferably, inverting input of the output end of the first amplifier by the 6th capacitance connection to the second amplifier, second
The inverting input of amplifier (is connected to the output end of the second amplifier, the normal phase input end of the second amplifier passes through by the tenth resistance
Eleventh resistor is grounded, and the output end of the second amplifier is connected to the inverting input of the first amplifier.
A kind of noise-reduction method of above-mentioned improved earphone noise reduction system, includes the following steps：
A, noise Rx module detects outside noise signal；
B, noise filtering module is filtered noise signal；
C, noise analysis module analyzes noise signal, and sends out control to noise suppression module according to analysis result
Signal；
D, noise suppression module sends out inhibition signal according to control signal, inhibits to noise.
Preferably, in step C, noise analysis module carries out analysis to noise signal and includes the following steps,
C1, noise analysis module carry out piecemeal to noise signal；
C2, each noise signal signature waveform in the block of extraction；
C3, the signature waveform of similar frequency bands is merged, Fourier's contravariant then is carried out to the signature waveform after merging
It changes, be inhibited signal collection of illustrative plates.
It is using advantageous effect caused by above-mentioned technical proposal：The present invention is effective pre- by being carried out to noise signal
Processing, improves the Feature Saliency of noise signal.Then utilize signature waveform composition inhibit signal, can effectively reduce for
The operand of noise analysis.
Description of the drawings
Fig. 1 is the schematic diagram of a specific implementation mode of the invention.
Fig. 2 is the circuit diagram of noise filtering module in a specific implementation mode of the invention.
Specific implementation mode
Referring to Fig.1-2, a specific implementation mode of the invention includes,
Noise Rx module 1, for detecting outside noise signal；
Noise filtering module 2, for being filtered to noise signal；
Noise analysis module 3 sends out control signal for analyzing noise signal, and to noise suppression module 4；
Noise suppression module 4, for sending out the inhibition signal for inhibiting noise.
The input terminal of the noise filtering module 2 is connected to the first fortune by concatenated first capacitance C1 and the second capacitance C2
The normal phase input end of A1 is put, passes through concatenated first resistor R1, zener diode DZ between the first capacitance C1 and the second capacitance C2
It is grounded with third capacitance C3, is connected to the first amplifier A1's by second resistance R2 between first resistor R1 and zener diode DZ
Output end, the positive input of the first amplifier A1 are connected to the collector of the first triode Q1, the first fortune by 3rd resistor R3
The positive input for putting A1 is connected to the base stage of the first triode Q1 by concatenated 4th resistance R4 and the 4th capacitance C4, and first
The emitter of triode Q1 is connected to by the 5th capacitance C5 ground connection, the positive input of the first amplifier A1 by the 5th resistance R5
The positive input of the collector of second triode Q2, the first amplifier A1 is connected by concatenated 4th resistance R4 and the 6th resistance R6
It is connected to the base stage of the second triode Q2, for the emitter of the second triode Q2 by the 7th resistance R7 ground connection, the first amplifier A1's is anti-
Phase input terminal is connected to the first amplifier by the 8th resistance R8 ground connection, the inverting input of the first amplifier A1 by the 9th resistance R9
The output end of A1, the output end of the output end of the first amplifier A1 as noise filtering module 2.
The output end of first amplifier A1 is connected to the inverting input of the second amplifier A2, the second amplifier by the 6th capacitance C6
The inverting input of A2 is connected to the output end of the second amplifier A2, the normal phase input end of the second amplifier A2 by the tenth resistance R10
It is grounded by eleventh resistor R11, the output end of the second amplifier A2 is connected to the inverting input of the first amplifier A1.
Wherein, first resistor R1 is 2.5k Ω, second resistance R2 is 1k Ω, 3rd resistor R3 is 5k Ω, the 4th resistance R4
For 11.5k Ω, the 5th resistance R5 is 4.5k Ω, and the 6th resistance R6 is 7k Ω, the 7th resistance R7 is 10k Ω, the 8th resistance R8 is
15k Ω, the 9th resistance R9 are 3.5k Ω, the tenth resistance R10 is 6k Ω, eleventh resistor R11 is 2.5k Ω.First capacitance C1 is
120 μ F, the second capacitance C2 are 240 μ F, and third capacitance C3 is that 500 μ F, the 4th capacitance C4 are 100 μ F, and the 5th capacitance C5 is 200 μ
F, the 6th capacitance C6 are 250 μ F.The voltage stabilizing value of zener diode DZ is 2 times of average voltage in voicefrequency circuit.
A kind of noise-reduction method for the improved earphone noise reduction system stated, includes the following steps：
A, noise Rx module 1 detects outside noise signal；
B, noise filtering module 2 is filtered noise signal；
C, noise analysis module 3 analyzes noise signal, and sends out control to noise suppression module 4 according to analysis result
Signal processed；
D, noise suppression module 4 sends out inhibition signal according to control signal, inhibits to noise.
In step C, noise analysis module 3 carries out analysis to noise signal and includes the following steps,
C1, noise analysis module 3 carry out piecemeal to noise signal；
C2, each noise signal signature waveform in the block of extraction；
C3, the signature waveform of similar frequency bands is merged, Fourier's contravariant then is carried out to the signature waveform after merging
It changes, be inhibited signal collection of illustrative plates.
Inhibition signal collection of illustrative plates for obtained different noise signal blocks, by the inhibition signal graph of adjacent noise block
Spectrum carries out time domain stretching, makes it have 15%~20% overlapping region.Inhibition signal in overlapping region is carried out linear
Combination, while the mapping relations for respectively inhibiting signal collection of illustrative plates overlapping region are established before and after linear combination, utilize this mapping relations pair
The same Non-overlapping Domain for inhibiting signal collection of illustrative plates is calibrated.By this process, entire inhibition signal pair can effectively improve
Link up in the inhibition of noise and spend, improves noise reduction.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of improved earphone noise reduction system, it is characterised in that：Including,
Noise Rx module (1), for detecting outside noise signal；
Noise filtering module (2), for being filtered to noise signal；
Noise analysis module (3) sends out control signal for analyzing noise signal, and to noise suppression module (4)；
Noise suppression module (4), for sending out the inhibition signal for inhibiting noise.
2. improved earphone noise reduction system according to claim 1, it is characterised in that：The noise filtering module (2)
Input terminal is connected to the normal phase input end of the first amplifier (A1) by concatenated first capacitance (C1) and the second capacitance (C2), and first
Pass through concatenated first resistor (R1), zener diode (DZ) and third capacitance (C3) between capacitance (C1) and the second capacitance (C2)
Ground connection, is connected to the output of the first amplifier (A1) by second resistance (R2) between first resistor (R1) and zener diode (DZ)
End, the positive input of the first amplifier (A1) are connected to the collector of the first triode (Q1) by 3rd resistor (R3), and first
The positive input of amplifier (A1) is connected to the first triode (Q1) by concatenated 4th resistance (R4) and the 4th capacitance (C4)
Base stage, the emitter of the first triode (Q1) is grounded by the 5th capacitance (C5), and the positive input of the first amplifier (A1) is logical
Cross the collector that the 5th resistance (R5) is connected to the second triode (Q2), the positive input of the first amplifier (A1) passes through concatenated
4th resistance (R4) and the 6th resistance (R6) are connected to the base stage of the second triode (Q2), and the emitter of the second triode (Q2) is logical
The 7th resistance (R7) ground connection is crossed, the inverting input of the first amplifier (A1) is grounded by the 8th resistance (R8), the first amplifier (A1)
Inverting input the output end of the first amplifier (A1) is connected to by the 9th resistance (R9), the output end of the first amplifier (A1) is made
For the output end of noise filtering module (2).
3. improved earphone noise reduction system according to claim 2, it is characterised in that：The output end of first amplifier (A1) is logical
The inverting input that the 6th capacitance (C6) is connected to the second amplifier (A2) is crossed, the inverting input of the second amplifier (A2) passes through the tenth
Resistance (R10) is connected to the output end of the second amplifier (A2), and the normal phase input end of the second amplifier (A2) passes through eleventh resistor
(R11) it is grounded, the output end of the second amplifier (A2) is connected to the inverting input of the first amplifier (A1).
4. a kind of noise-reduction method of the improved earphone noise reduction system described in claim 1-3 any one, it is characterised in that packet
Include following steps：
A, noise Rx module (1) detects outside noise signal；
B, noise filtering module (2) is filtered noise signal；
C, noise analysis module (3) analyzes noise signal, and sends out control to noise suppression module (4) according to analysis result
Signal processed；
D, noise suppression module (4) sends out inhibition signal according to control signal, inhibits to noise.
5. the noise-reduction method of improved earphone noise reduction system according to claim 4, it is characterised in that：In step C, noise
Analysis module (3) carries out analysis to noise signal and includes the following steps,
C1, noise analysis module (3) carry out piecemeal to noise signal；
C2, each noise signal signature waveform in the block of extraction；
C3, the signature waveform of similar frequency bands is merged, Fourier inversion then is carried out to the signature waveform after merging, is obtained
To inhibition signal collection of illustrative plates.
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| CN201810511153.0A CN108540888B (en) | 2018-05-24 | 2018-05-24 | Improved earphone noise reduction system and noise reduction method thereof |
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| CN201810511153.0A CN108540888B (en) | 2018-05-24 | 2018-05-24 | Improved earphone noise reduction system and noise reduction method thereof |
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| CN108540888A true CN108540888A (en) | 2018-09-14 |
| CN108540888B CN108540888B (en) | 2020-12-18 |
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Citations (7)
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| CN101308662A (en) * | 2007-05-18 | 2008-11-19 | 索尼株式会社 | Imaging device, sound treating circuit, noise reduction circuit, noise reduction method and program |
| CN201425835Y (en) * | 2009-06-19 | 2010-03-17 | 深圳市同洲电子股份有限公司 | Noise cancellation device for mobile phones |
| CN102737646A (en) * | 2012-06-21 | 2012-10-17 | 佛山市瀚芯电子科技有限公司 | Real-time dynamic voice noise reduction method for single microphone |
| CN103634439A (en) * | 2012-08-21 | 2014-03-12 | 鸿富锦精密工业(武汉)有限公司 | Noise reduction processing system |
| CN104703093A (en) * | 2013-12-09 | 2015-06-10 | 中国移动通信集团公司 | Audio output method and device |
| US20150189447A1 (en) * | 2013-12-27 | 2015-07-02 | Gn Resound A/S | Hearing instrument with switchable power supply voltage |
| CN106535022A (en) * | 2016-12-07 | 2017-03-22 | 北京工业大学 | Earphone noise reduction circuit with balancer and power amplification function |
-
2018
- 2018-05-24 CN CN201810511153.0A patent/CN108540888B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101308662A (en) * | 2007-05-18 | 2008-11-19 | 索尼株式会社 | Imaging device, sound treating circuit, noise reduction circuit, noise reduction method and program |
| CN201425835Y (en) * | 2009-06-19 | 2010-03-17 | 深圳市同洲电子股份有限公司 | Noise cancellation device for mobile phones |
| CN102737646A (en) * | 2012-06-21 | 2012-10-17 | 佛山市瀚芯电子科技有限公司 | Real-time dynamic voice noise reduction method for single microphone |
| CN103634439A (en) * | 2012-08-21 | 2014-03-12 | 鸿富锦精密工业(武汉)有限公司 | Noise reduction processing system |
| CN104703093A (en) * | 2013-12-09 | 2015-06-10 | 中国移动通信集团公司 | Audio output method and device |
| US20150189447A1 (en) * | 2013-12-27 | 2015-07-02 | Gn Resound A/S | Hearing instrument with switchable power supply voltage |
| CN106535022A (en) * | 2016-12-07 | 2017-03-22 | 北京工业大学 | Earphone noise reduction circuit with balancer and power amplification function |
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| CN108540888B (en) | 2020-12-18 |
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Effective date of registration: 20230905 Address after: No. 358 Xingping Third Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province, 314299 Patentee after: PINGHU HUARUI GLASS Co.,Ltd. Address before: 314000 No.21, shangrenbang middle, panjiabang village, Xincheng Town, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee before: Jiaxing Hengyi Safety Service Co.,Ltd. |
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