CN113163300A - Audio noise reduction circuit and electronic equipment - Google Patents
Audio noise reduction circuit and electronic equipment Download PDFInfo
- Publication number
- CN113163300A CN113163300A CN202110233135.2A CN202110233135A CN113163300A CN 113163300 A CN113163300 A CN 113163300A CN 202110233135 A CN202110233135 A CN 202110233135A CN 113163300 A CN113163300 A CN 113163300A
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- 230000005236 sound signal Effects 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 238000011156 evaluation Methods 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 210000005069 ears Anatomy 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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
Abstract
The invention discloses an audio noise reduction circuit, which comprises a microphone, an analog-digital conversion circuit, a noise reduction processing circuit, a digital-analog conversion circuit and an audio input, wherein the microphone is connected with the analog-digital conversion circuit; the sound signal collected by the microphone is processed by the analog-digital conversion circuit to obtain a first time domain audio signal; the noise reduction processing circuit comprises an evaluation circuit and a filter circuit, wherein the evaluation circuit is connected with an audio input to obtain a second time domain audio signal of the audio input; the evaluation circuit is configured to perform response evaluation processing on the first time domain audio signal and the second time domain audio signal to obtain frequency response data, and the filter circuit is configured to perform filter processing on the frequency response data to output noise reduction audio. In addition, the invention also provides electronic equipment which comprises the audio noise reduction circuit. The audio noise reduction circuit and the electronic equipment provided by the invention realize noise reduction according to the environmental sound, and improve the noise reduction effect.
Description
Technical Field
The invention relates to the technical field of audio noise reduction, in particular to an audio noise reduction circuit and electronic equipment.
Background
When audio is played, especially when the earphone is used to play audio, the structure or material of the earphone is usually used to reduce noise, but the noise reduction effect cannot be achieved for sound with specific frequency (for example, high-frequency sound with harsh ears).
Disclosure of Invention
The invention provides an audio noise reduction circuit and electronic equipment, and aims to solve the problem of poor noise reduction effect in the prior art by providing the audio noise reduction circuit to realize noise reduction.
In order to achieve the above object, the present invention provides an audio noise reduction circuit, which includes a microphone, an analog-to-digital conversion circuit, a noise reduction processing circuit, and a digital-to-analog conversion circuit; the microphone is connected with the analog data conversion circuit to receive sound and perform analog-digital conversion; the noise reduction processing circuit is connected with the analog-digital conversion circuit; the sound signal collected by the microphone is processed by the analog-digital conversion circuit to obtain a first time domain audio signal; the noise reduction processing circuit comprises an evaluation circuit and a filter circuit, the evaluation circuit is respectively connected with the analog-digital conversion circuit and the digital-analog conversion circuit, and the filter circuit is connected with the evaluation circuit; the evaluation circuit is connected with the audio input to obtain a second time domain audio signal of the audio input; the evaluation circuit is configured to perform response evaluation processing on the first time domain audio signal and the second time domain audio signal to obtain frequency response data, and the filter circuit is configured to perform filter processing on the frequency response data to output noise reduction audio.
Preferably, the microphones comprise an internal microphone and an external microphone.
Preferably, the noise reduction audio is converted by the digital-to-analog conversion circuit and then played by a loudspeaker.
Preferably, the audio noise reduction circuit further includes an amplifier, the amplifier is respectively connected to the filter circuit and the digital-to-analog conversion circuit, and the amplifier is configured to receive the audio signal of the filter circuit and amplify and output the audio signal to the digital-to-analog conversion circuit.
Preferably, the filtering process of the frequency response data by the filtering circuit includes FIR filtering or IIR filtering.
Preferably, the filter response data is processed by the filter circuit to output filter coefficients, and the filter coefficients are used for noise reduction processing.
Preferably, the audio noise reduction circuit further comprises a sounder, the sounder is connected with the evaluation circuit, and the sounder is used for emitting audio signals to perform noise reduction coefficient testing.
Meanwhile, the invention provides an electronic device which comprises the audio noise reduction circuit.
According to the audio noise reduction circuit and the electronic device, the noise reduction processing circuit is used for carrying out noise reduction according to the environmental sound through the first time domain audio signal of the environmental sound collected by the microphone and the second time domain audio signal input by the audio frequency, and the noise reduction effect is improved through evaluation and filtering processing.
Drawings
Fig. 1 is a schematic structural diagram of an audio noise reduction circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. 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 an embodiment of the present invention, the audio noise reduction circuit includes a microphone 10, an analog-to-digital conversion circuit 20, a noise reduction processing circuit 30, a digital-to-analog conversion circuit 40, an audio input 50, a sound generator 60, an amplifier 70, and a speaker 80; the microphone 10 is connected to the analog-to-digital conversion circuit 20 to receive sound and perform analog-to-digital conversion; the microphone 10 includes an internal microphone and an external microphone, and different microphones are used for receiving different environmental sounds; the noise reduction processing circuit 30 is connected to the analog-to-digital conversion circuit 20; the sound signal collected by the microphone 10 is processed by the analog-to-digital conversion circuit 20 to obtain a first time domain audio signal; the noise reduction processing circuit 30 comprises an evaluation circuit 31 and a filter circuit 32, the evaluation circuit 31 is respectively connected with the analog-digital conversion circuit 20 and the digital-analog conversion circuit 40, and the filter circuit 31 is connected with the evaluation circuit 32; the evaluation circuit 31 is connected to the audio input 50 to obtain a second time domain audio signal of the audio input 50; the evaluation circuit 31 is configured to perform response evaluation processing on the first time domain audio signal and the second time domain audio signal to obtain frequency response data, and the filter circuit 32 is configured to perform filter processing on the frequency response data to output noise reduction audio. Specifically, the first time domain audio signal and the second time domain audio signal are located in different audio signals of different frequency bands, so that different frequency responses of different frequency bands can be obtained, thereby obtaining frequency response data. The filter circuit 32 acquires the frequency Response data from the evaluation circuit 31 and performs a filtering process on the frequency Response data, and the filtering process performed by the filter circuit 32 on the frequency Response data includes a non-recursive Filter (FIR) filter or an Infinite Impulse Response (IIR) filter. The filter response data is processed by the filter circuit 32 to output a filter coefficient, and the filter coefficient is used for noise reduction processing. The generated filter coefficient can be used for further adjusting the phase reversal cancellation waveform used by the audio noise reduction circuit, so that the phase reversal cancellation waveform has more accurate amplitude and phase, therefore, the audio noise reduction circuit can have better noise elimination effect, and the generated filter coefficient can be used as the adjusted noise reduction coefficient to further input noise reduction audio. The amplifier 70 is respectively connected to the filter circuit 32 and the digital-to-analog conversion circuit 40, and is configured to receive the audio signal of the filter circuit 32, amplify the audio signal and output the amplified audio signal to the digital-to-analog conversion circuit 40; the speaker 80 is connected to the digital-to-analog conversion circuit 40; the noise reduction audio is converted by the digital-to-analog conversion circuit 40 and then played through the speaker 80.
The audio noise reduction circuit further comprises a sound generator 60, the sound generator 60 is connected with the evaluation circuit 31, and the sound generator 60 is used for emitting an audio signal to perform noise reduction coefficient test, that is, the audio signal with a specified frequency emitted by the sound generator 60 is used for debugging the noise reduction coefficient. In the debugging of the noise reduction coefficient, in addition to using the audio signal generated by the sound generator 60 as the test sample, the audio/sound to be played may also be used as the sample, wherein the audio signal may be a single-frequency audio or a multi-frequency audio.
Furthermore, the present invention provides an electronic device comprising an audio noise reduction circuit as described above.
Compared with the prior art, the audio noise reduction circuit and the electronic equipment provided by the invention have the advantages that the noise reduction processing circuit is used for carrying out noise reduction according to the environmental sound through the first time domain audio signal of the environmental sound collected by the microphone and the second time domain audio signal of the audio input, and the noise reduction effect is improved through evaluation and filtering processing.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (8)
1. An audio noise reduction circuit, wherein the audio noise reduction circuit comprises a microphone, an analog-to-digital conversion circuit, a noise reduction processing circuit, a digital-to-analog conversion circuit and an audio input; the microphone is connected with the analog data conversion circuit to receive sound and perform analog-digital conversion; the noise reduction processing circuit is connected with the analog-digital conversion circuit; the sound signal collected by the microphone is processed by the analog-digital conversion circuit to obtain a first time domain audio signal; the noise reduction processing circuit comprises an evaluation circuit and a filter circuit, the evaluation circuit is respectively connected with the analog-digital conversion circuit and the digital-analog conversion circuit, and the filter circuit is connected with the evaluation circuit; the evaluation circuit is connected with the audio input to obtain a second time-domain audio signal of the audio input; the evaluation circuit is configured to perform response evaluation processing on the first time domain audio signal and the second time domain audio signal to obtain frequency response data, and the filter circuit is configured to perform filter processing on the frequency response data to output noise reduction audio.
2. The audio noise reduction circuit of claim 1, wherein the microphone comprises an internal microphone and an external microphone.
3. The audio noise reduction circuit of claim 1, wherein the noise reduction audio is converted by the digital-to-analog conversion circuit and played through a speaker.
4. The audio noise reduction circuit of claim 1, further comprising an amplifier, wherein the amplifier is connected to the filter circuit and the digital-to-analog conversion circuit, and the amplifier is configured to receive the audio signal from the filter circuit and amplify and output the audio signal to the digital-to-analog conversion circuit.
5. The audio noise reduction circuit of claim 1, wherein the filtering processing of the frequency response data by the filtering circuit comprises FIR filtering or IIR filtering.
6. The audio noise reduction circuit of claim 5, wherein the filter response data is processed by the filter circuit to output filter coefficients, and the filter coefficients are used for noise reduction.
7. The audio noise reduction circuit of claim 1, further comprising a sound generator connected to the evaluation circuit, the sound generator configured to emit an audio signal for noise reduction coefficient testing.
8. An electronic device, characterized in that the electronic device comprises an audio noise reduction circuit according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110233135.2A CN113163300A (en) | 2021-03-02 | 2021-03-02 | Audio noise reduction circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110233135.2A CN113163300A (en) | 2021-03-02 | 2021-03-02 | Audio noise reduction circuit and electronic equipment |
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| CN113163300A true CN113163300A (en) | 2021-07-23 |
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| CN202110233135.2A Pending CN113163300A (en) | 2021-03-02 | 2021-03-02 | Audio noise reduction circuit and electronic equipment |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867355A (en) * | 2009-04-17 | 2010-10-20 | 哈曼国际工业有限公司 | Use the active noise control system of infinite impulse response filter |
| US20120170766A1 (en) * | 2011-01-05 | 2012-07-05 | Cambridge Silicon Radio Limited | ANC For BT Headphones |
| CN107371079A (en) * | 2017-04-17 | 2017-11-21 | 恒玄科技（上海）有限公司 | The diamylose gram noise reduction system and noise-reduction method of a kind of earphone |
| CN107889007A (en) * | 2017-10-27 | 2018-04-06 | 恒玄科技（上海）有限公司 | Eliminate active denoising method and system of the noise reduction path to broadcasting acoustic impacts |
| CN107945784A (en) * | 2017-12-14 | 2018-04-20 | 成都必盛科技有限公司 | A kind of automatic calibrating method and device of active noise reduction audio frequency apparatus |
| CN108028049A (en) * | 2015-09-14 | 2018-05-11 | 美商楼氏电子有限公司 | Microphone signal merges |
| CN111866662A (en) * | 2019-04-25 | 2020-10-30 | 瑞昱半导体股份有限公司 | Adjusting method for active noise reduction and related circuit |
-
2021
- 2021-03-02 CN CN202110233135.2A patent/CN113163300A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867355A (en) * | 2009-04-17 | 2010-10-20 | 哈曼国际工业有限公司 | Use the active noise control system of infinite impulse response filter |
| US20120170766A1 (en) * | 2011-01-05 | 2012-07-05 | Cambridge Silicon Radio Limited | ANC For BT Headphones |
| CN108028049A (en) * | 2015-09-14 | 2018-05-11 | 美商楼氏电子有限公司 | Microphone signal merges |
| CN107371079A (en) * | 2017-04-17 | 2017-11-21 | 恒玄科技（上海）有限公司 | The diamylose gram noise reduction system and noise-reduction method of a kind of earphone |
| CN107889007A (en) * | 2017-10-27 | 2018-04-06 | 恒玄科技（上海）有限公司 | Eliminate active denoising method and system of the noise reduction path to broadcasting acoustic impacts |
| CN107945784A (en) * | 2017-12-14 | 2018-04-20 | 成都必盛科技有限公司 | A kind of automatic calibrating method and device of active noise reduction audio frequency apparatus |
| CN111866662A (en) * | 2019-04-25 | 2020-10-30 | 瑞昱半导体股份有限公司 | Adjusting method for active noise reduction and related circuit |
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Address after: Room 238, room 406, 1 Yichuang street, Huangpu District, Guangzhou, Guangdong 510700 Applicant after: Guangzhou langguo Electronic Technology Co.,Ltd. Address before: Room 238, room 406, 1 Yichuang street, Huangpu District, Guangzhou, Guangdong 510700 Applicant before: GUANGZHOU LANGO ELECTRONIC SCIENCE & TECHNOLOGY Co.,Ltd. |
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Application publication date: 20210723 |
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