CN108540888B - Improved earphone noise reduction system and noise reduction method thereof - Google Patents
Improved earphone noise reduction system and noise reduction method thereof Download PDFInfo
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- CN108540888B CN108540888B CN201810511153.0A CN201810511153A CN108540888B CN 108540888 B CN108540888 B CN 108540888B CN 201810511153 A CN201810511153 A CN 201810511153A CN 108540888 B CN108540888 B CN 108540888B
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- 238000000034 method Methods 0.000 title claims description 10
- 230000001629 suppression Effects 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000004458 analytical method Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 29
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 2
- 238000011946 reduction process Methods 0.000 abstract description 2
- 230000005764 inhibitory process Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
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Abstract
The invention discloses an improved earphone noise reduction system, which comprises a noise receiving module, a noise processing module and a noise processing module, wherein the noise receiving module is used for detecting an external noise signal; the noise filtering module is used for filtering the noise signal; the noise analysis module is used for analyzing the noise signal and sending a control signal to the noise suppression module; and the noise suppression module is used for sending a suppression signal for suppressing noise. The invention can improve the defects of the prior art and simplify the operation amount of the noise reduction process.
Description
Technical Field
The invention relates to the technical field of audio processing, in particular to an improved earphone noise reduction system and a noise reduction method thereof.
Background
With the development of audio processing technology, noise reduction headphones have become a popular product in recent years. The principle of the noise reduction earphone is that the external noise is actively subjected to noise reduction processing by sending out a suppression signal for counteracting the external noise. Although the existing noise reduction method can achieve a good noise reduction effect, the used suppression signals are complex, the calculation amount is large, the requirement on hardware is high, and the cost of the noise reduction earphone is high.
Disclosure of Invention
The invention aims to provide an improved earphone noise reduction system and a noise reduction method thereof, which can overcome the defects of the prior art and simplify the calculation amount in the noise reduction process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
An improved headphone noise reduction system comprising,
the noise receiving module is used for detecting an external noise signal;
the noise filtering module is used for filtering the noise signal;
the noise analysis module is used for analyzing the noise signal and sending a control signal to the noise suppression module;
and the noise suppression module is used for sending a suppression signal for suppressing noise.
Preferably, the input end of the noise filtering module is connected to the positive input end of the first operational amplifier through a first capacitor and a second capacitor which are connected in series, the first capacitor and the second capacitor are grounded through a first resistor, a voltage stabilizing diode and a third capacitor which are connected in series, the first resistor and the voltage stabilizing diode are connected to the output end of the first operational amplifier through a second resistor, the positive input end of the first operational amplifier is connected to the collector electrode of the first triode through a third resistor, the positive input end of the first operational amplifier is connected to the base electrode of the first triode through a fourth resistor and a fourth capacitor which are connected in series, the emitter electrode of the first triode is grounded through a fifth capacitor, the positive input end of the first operational amplifier is connected to the collector electrode of the second triode through a fifth resistor, the positive input end of the first operational amplifier is connected to the base electrode of the second triode through a fourth resistor and a sixth resistor which are connected in series, the emitting electrode of the second triode is grounded through a seventh resistor, the inverting input end of the first operational amplifier is grounded through an eighth resistor, the inverting input end of the first operational amplifier is connected to the output end of the first operational amplifier through a ninth resistor, and the output end of the first operational amplifier serves as the output end of the noise filtering module.
Preferably, the output terminal of the first operational amplifier is connected to the inverting input terminal of the second operational amplifier through a sixth capacitor, the inverting input terminal of the second operational amplifier is connected to the ground through a tenth resistor (the second operational amplifier is connected to the output terminal of the second operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to the ground through an eleventh resistor, and the output terminal of the second operational amplifier is connected to the inverting input terminal of the first operational amplifier.
A noise reduction method of the improved noise reduction system for the earphone comprises the following steps:
A. the noise receiving module detects an external noise signal;
B. the noise filtering module is used for filtering the noise signal;
C. the noise analysis module analyzes the noise signal and sends a control signal to the noise suppression module according to the analysis result;
D. the noise suppression module sends out a suppression signal according to the control signal to suppress noise.
Preferably, in step C, the noise analysis module analyzing the noise signal comprises the steps of,
c1, partitioning the noise signal by a noise analysis module;
c2, extracting characteristic waveforms in each noise signal block;
and C3, combining the characteristic waveforms of the same frequency band, and then performing Fourier inversion on the combined characteristic waveforms to obtain a suppression signal map.
Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: the invention improves the feature significance of the noise signal by effectively preprocessing the noise signal. Then, the suppression signal is composed by using the characteristic waveform, so that the computation amount of noise analysis can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention.
Fig. 2 is a circuit diagram of a noise filtering module according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1-2, one embodiment of the present invention includes,
the noise receiving module 1 is used for detecting an external noise signal;
the noise filtering module 2 is used for filtering the noise signal;
the noise analysis module 3 is used for analyzing the noise signal and sending a control signal to the noise suppression module 4;
and the noise suppression module 4 is used for sending out a suppression signal for suppressing noise.
An input end of the noise filtering module 2 is connected to a non-inverting input end of the first operational amplifier a1 through a first capacitor C1 and a second capacitor C2 which are connected in series, the ground is connected between the first capacitor C1 and the second capacitor C2 through a first resistor R1, a zener diode DZ and a third capacitor C3 which are connected in series, the ground is connected between the first resistor R1 and the zener diode DZ through a second resistor R2 to an output end of the first operational amplifier a1, a forward input end of the first operational amplifier a1 is connected to a collector of the first triode Q1 through a third resistor R3, a forward input end of the first operational amplifier a1 is connected to a base of the first triode Q1 through a fourth resistor R4 and a fourth capacitor C56 which are connected in series, an emitter of the first triode Q1 is connected to the ground through a fifth capacitor C5, a forward input end of the first operational amplifier a1 is connected to a base of the second triode Q2 through a fourth resistor R5, a forward input end of the first operational amplifier a2 is connected to a collector of the third triode Q2 through a third resistor R2, an emitter of the second triode Q2 is grounded through a seventh resistor R7, an inverting input terminal of the first operational amplifier a1 is grounded through an eighth resistor R8, an inverting input terminal of the first operational amplifier a1 is connected to an output terminal of the first operational amplifier a1 through a ninth resistor R9, and an output terminal of the first operational amplifier a1 serves as an output terminal of the noise filtering module 2.
The output end of the first operational amplifier a1 is connected to the inverting input end of the second operational amplifier a2 through a sixth capacitor C6, the inverting input end of the second operational amplifier a2 is connected to the output end of the second operational amplifier a2 through a tenth resistor R10, the non-inverting input end of the second operational amplifier a2 is grounded through an eleventh resistor R11, and the output end of the second operational amplifier a2 is connected to the inverting input end of the first operational amplifier a 1.
The first resistor R1 is 2.5k Ω, the second resistor R2 is 1k Ω, the third resistor R3 is 5k Ω, the fourth resistor R4 is 11.5k Ω, the fifth resistor R5 is 4.5k Ω, the sixth resistor R6 is 7k Ω, the seventh resistor R7 is 10k Ω, the eighth resistor R8 is 15k Ω, the ninth resistor R9 is 3.5k Ω, the tenth resistor R10 is 6k Ω, and the eleventh resistor R11 is 2.5k Ω. The first capacitor C1 is 120 μ F, the second capacitor C2 is 240 μ F, the third capacitor C3 is 500 μ F, the fourth capacitor C4 is 100 μ F, the fifth capacitor C5 is 200 μ F, and the sixth capacitor C6 is 250 μ F. The voltage regulation value of the voltage regulation diode DZ is 2 times of the average voltage value in the audio circuit.
The improved noise reduction method for the earphone noise reduction system comprises the following steps:
A. the noise receiving module 1 detects an external noise signal;
B. the noise filtering module 2 carries out filtering processing on the noise signal;
C. the noise analysis module 3 analyzes the noise signal and sends a control signal to the noise suppression module 4 according to the analysis result;
D. the noise suppression module 4 sends out a suppression signal according to the control signal to suppress the noise.
In step C, the noise analysis module 3 analyzes the noise signal including the following steps,
c1, the noise analysis module 3 blocks the noise signal;
c2, extracting characteristic waveforms in each noise signal block;
and C3, combining the characteristic waveforms of the same frequency band, and then performing Fourier inversion on the combined characteristic waveforms to obtain a suppression signal map.
And for the obtained suppression signal maps of different noise signal blocks, performing time domain stretching on the suppression signal maps of adjacent noise signal blocks to enable the suppression signal maps to have an overlapping area of 15% -20%. And performing linear combination on the inhibition signals in the overlapping region, simultaneously establishing a mapping relation of the overlapping region of each inhibition signal map before and after the linear combination, and calibrating the non-overlapping region of the same inhibition signal map by using the mapping relation. Through the process, the suppression consistency of the whole suppression signal on the noise can be effectively improved, and the noise reduction effect is improved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. An improved headphone noise reduction system, characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the noise receiving module (1) is used for detecting an external noise signal;
the noise filtering module (2) is used for filtering the noise signal;
an input end of the noise filtering module (2) is connected to a positive input end of a first operational amplifier (A1) through a first capacitor (C1) and a second capacitor (C2) which are connected in series, a first resistor (R1), a zener Diode (DZ) and a third capacitor (C3) which are connected in series are connected between the first capacitor (C1) and the second capacitor (C2) to ground, a second resistor (R2) is connected between the first resistor (R1) and the zener Diode (DZ) to an output end of the first operational amplifier (A1), a positive input end of the first operational amplifier (A1) is connected to a collector of a first triode (Q1) through a third resistor (R3), a positive input end of the first operational amplifier (A1) is connected to a base of the first triode (Q1) through a fourth resistor (R4) and a fourth capacitor (C42) which are connected in series, a positive input end of the first triode (Q1) is connected to the collector of the first triode (Q1) through a fifth operational amplifier (R58 1) and a collector of the fifth triode (R465), the positive input end of the first operational amplifier (A1) is connected to the base of the second triode (Q2) through a fourth resistor (R4) and a sixth resistor (R6) which are connected in series, the emitter of the second triode (Q2) is grounded through a seventh resistor (R7), the inverting input end of the first operational amplifier (A1) is grounded through an eighth resistor (R8), the inverting input end of the first operational amplifier (A1) is connected to the output end of the first operational amplifier (A1) through a ninth resistor (R9), and the output end of the first operational amplifier (A1) serves as the output end of the noise filtering module (2);
the output end of the first operational amplifier (A1) is connected to the inverting input end of the second operational amplifier (A2) through a sixth capacitor (C6), the inverting input end of the second operational amplifier (A2) is connected to the output end of the second operational amplifier (A2) through a tenth resistor (R10), the non-inverting input end of the second operational amplifier (A2) is grounded through an eleventh resistor (R11), and the output end of the second operational amplifier (A2) is connected to the inverting input end of the first operational amplifier (A1);
the noise analysis module (3) is used for analyzing the noise signal and sending a control signal to the noise suppression module (4);
and the noise suppression module (4) is used for sending out a suppression signal for suppressing noise.
2. A method of noise reduction for an improved headphone noise reduction system as defined in claim 1, comprising the steps of:
A. the noise receiving module (1) detects an external noise signal;
B. the noise filtering module (2) is used for filtering the noise signal;
C. the noise analysis module (3) analyzes the noise signal and sends a control signal to the noise suppression module (4) according to the analysis result;
D. the noise suppression module (4) sends out a suppression signal according to the control signal to suppress noise.
3. The improved noise reduction method for a headphone noise reduction system according to claim 2, wherein: in step C, the noise analysis module (3) analyzes the noise signal and comprises the following steps,
c1, partitioning the noise signal by a noise analysis module (3);
c2, extracting characteristic waveforms in each noise signal block;
and C3, combining the characteristic waveforms of the same frequency band, and then performing Fourier inversion on the combined characteristic waveforms to obtain a suppression signal map.
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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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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104703093A (en) * | 2013-12-09 | 2015-06-10 | ***通信集团公司 | Audio output method and device |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5056157B2 (en) * | 2007-05-18 | 2012-10-24 | ソニー株式会社 | Noise reduction circuit |
| 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 |
| CN103634439B (en) * | 2012-08-21 | 2016-12-21 | 佛山市爱翔电器有限公司 | Noise reduction process system |
| US9900708B2 (en) * | 2013-12-27 | 2018-02-20 | Gn Hearing A/S | Hearing instrument with switchable power supply voltage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104703093A (en) * | 2013-12-09 | 2015-06-10 | ***通信集团公司 | Audio output method and device |
| 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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Effective date of registration: 20201130 Address after: No.21, shangrenbang middle, panjiabang village, Xincheng Town, Xiuzhou District, Jiaxing City, Zhejiang Province, 314000 Applicant after: Jiaxing Hengyi Safety Service Co.,Ltd. Address before: 071000 holiday resort 15-1-101, Baoding, Hebei Applicant before: Han Xue |
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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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Denomination of invention: An improved headphone noise reduction system and its noise reduction method Granted publication date: 20201218 Pledgee: Jiaxing Bank Co.,Ltd. Pinghu Branch Pledgor: PINGHU HUARUI GLASS Co.,Ltd. Registration number: Y2024980023412 |