CN112153505A - Noise reduction system and noise reduction method - Google Patents
Noise reduction system and noise reduction method Download PDFInfo
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- CN112153505A CN112153505A CN201910572176.7A CN201910572176A CN112153505A CN 112153505 A CN112153505 A CN 112153505A CN 201910572176 A CN201910572176 A CN 201910572176A CN 112153505 A CN112153505 A CN 112153505A
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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
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
Abstract
A noise reduction system is used for an electronic device. The electronic device includes a housing. The noise reduction system includes a first microphone, a second microphone, and a processor circuit. The first and second microphones are disposed in the housing. The first microphone is used for generating a first sound signal. The second microphone is located remotely from the housing relative to the first microphone. The second microphone is used for generating a second sound signal. The processor circuit is coupled to the first microphone and the second microphone. The processor circuit receives a first sound signal from a first microphone and a second sound signal from a second microphone. The processor circuit is used for calculating a difference value between the first sound signal and the second sound signal to obtain an equalization gain, and adjusting the first sound signal according to the equalization gain to generate a third sound signal. In addition, a noise reduction method is also provided. The noise reduction system and the noise reduction method can effectively reduce the influence of noise on the electronic device.
Description
Technical Field
The present invention relates to a signal processing system and a signal processing method, and more particularly, to a noise reduction system and a noise reduction method.
Background
In many electromechanical and optical devices, due to application situations and functional requirements, a microphone is built in the device or an external structure, and a structure or an element such as a mechanism, an electronic structure, an optical structure, etc. often generates vibration or audio noise during system operation, so that the built-in microphone easily receives the noise, thereby affecting the normal function of the microphone. Taking a projector as an example, the projector inevitably generates inevitable noise when the projector is turned on, and the microphone receives the noise together with the ambient sound outside the device. Therefore, it is an important issue to reduce the influence of vibration or audio noise generated by the internal devices of the system, and enhance the correct external sound signal to ensure the application function and improve the user experience.
The background section is only used to help the understanding of the present invention, and therefore the disclosure in the background section may include some known techniques which are not known to those skilled in the art. The statements in the "background" section do not represent that matter or the problems which may be solved by one or more embodiments of the present invention, but are known or appreciated by those skilled in the art before filing the present application.
Disclosure of Invention
The invention provides a noise reduction system and a noise reduction method, which can effectively reduce the influence of noise on an electronic device.
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.
To achieve one or a part of or all of the above or other objects, an embodiment of the present invention provides a noise reduction system for an electronic device. The electronic device includes a housing. The noise reduction system includes a first microphone, a second microphone, and a processor circuit. The first microphone is arranged in the shell. The first microphone is used for generating a first sound signal. The second microphone is arranged in the shell and is far away from the shell relative to the first microphone. The second microphone is used for generating a second sound signal. The processor circuit is coupled to the first microphone and the second microphone. The processor circuit receives a first sound signal from a first microphone and a second sound signal from a second microphone. The processor circuit is used for calculating a difference value of the first sound signal and the second sound signal to obtain an equalization gain, and adjusting the first sound signal according to the equalization gain to generate a third sound signal.
In order to achieve one or a part of or all of the above objectives or other objectives, another embodiment of the present invention provides a noise reduction method suitable for an electronic device. The electronic device comprises a shell and a noise reduction system arranged in the shell. The noise reduction system includes a first microphone, a second microphone, and a processor circuit. The noise reduction method comprises the following steps: generating a first sound signal through a first microphone; generating a second sound signal through a second microphone; calculating a difference between the first audio signal and the second audio signal by the processor circuit to obtain an equalization gain; and adjusting the first audio signal to generate a third audio signal according to the equalization gain through the processor circuit.
Based on the above, the embodiments of the invention have at least one of the following advantages or efficacies. The processor circuit adjusts the first sound signal according to the equalization gain to generate a third sound signal, so that the influence of noise on the electronic device can be effectively reduced.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram illustrating a noise reduction system according to an embodiment of the invention.
Fig. 2 is a schematic diagram illustrating the noise reduction system of the embodiment of fig. 1 disposed in an electronic device.
Fig. 3 is a schematic diagram illustrating signal strength received by different microphones of the embodiment of fig. 1.
Fig. 4 is a schematic diagram illustrating the received signal strength of different microphones in practical application according to the embodiment of fig. 1.
Fig. 5 is a schematic diagram illustrating an embodiment of adjusting the signal strength of the first audio signal by using the equalization gain in fig. 1.
FIG. 6 is a flowchart illustrating a noise reduction method according to an embodiment of the invention.
Detailed Description
The foregoing and other features and advantages of the invention will be apparent from the following, more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 1 is a schematic diagram illustrating a noise reduction system according to an embodiment of the invention. Fig. 2 is a schematic diagram illustrating the noise reduction system of the embodiment of fig. 1 disposed in an electronic device. Please refer to fig. 1 and fig. 2. The noise reduction system 100 includes a first microphone 110, a second microphone 120, a processor circuit 130, a first analog-to-digital converter circuit 140, and a second analog-to-digital converter circuit 150, the first analog-to-digital converter circuit 140 being coupled between the first microphone 110 and the processor circuit 130, the second analog-to-digital converter circuit 150 being coupled between the second microphone 120 and the processor circuit 130. The electronic device 200 includes a housing 210 and a vibrating element 220. The first microphone 110, the second microphone 120 and the vibration element 220 are disposed in the housing 210. In an embodiment, the casing 210 may include a sound-absorbing hole (not shown), through which the first microphone 110 is disposed in the casing 210 and receives the ambient sound 400 from the outside of the electronic device 200, or the first microphone 110 is directly disposed on an opening (not shown) of the casing 210 and is used for directly receiving the ambient sound 400 from the outside of the electronic device 200. The second microphone 120 is located away from the housing 210 relative to the first microphone 110. The first microphone 110 is disposed relative to the second microphone 120 away from the vibration element 220, and the second microphone 120 is disposed relative to the first microphone 110 adjacent to the vibration element 220.
In the present embodiment, the processor circuit 130, the first adc circuit 140 and the second adc circuit 150 may be circuits (not shown) in the electronic device 200, wherein the first adc circuit 140 and the second adc circuit 150 may be circuits disposed on a main circuit board (not shown) of the electronic device 200, or the first adc circuit 140 and the second adc circuit 150 may be independent circuits disposed in the electronic device 200. The Processor circuit 130 may be a Central Processing Unit (CPU), or other Programmable general purpose or special purpose Microprocessor (Microprocessor), Digital Signal Processor (DSP), Programmable Logic controller (ASIC), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), or other similar devices or combinations thereof, and the invention is not limited thereto. The processor circuit 130, the first analog-to-digital converter circuit 140 and the second analog-to-digital converter circuit 150 can be implemented by any one of the processor circuits and analog-to-digital converter circuits in the art, and the invention is not limited thereto. Embodiments thereof are capable of giving full cognizance to teaching, suggestions, and descriptions of implementations that fall within the ordinary skill of the art.
In the embodiment, the electronic device 200 is, for example, a projector, and the vibration element 220 is, for example, a fan, a color filter wheel, a phosphor wheel of the projector, or a motor for driving a projection lens to focus and adjust focus, but the invention is not limited thereto. The processor circuit 130 is, for example, a processor chip inside the projector. The vibration element 220 generates a noise 300 during operation. The first microphone 110 receives the noise 300 from the vibration element 220 and the ambient sound 400 from outside the housing 210 to generate a first sound signal S1, and the second microphone 120 receives the noise 300 from the vibration element 220 and the ambient sound 400 from outside the housing 210 to generate a second sound signal S2.
The audio received by the first microphone 110 and the second microphone 120 at the same time has noise 300 and ambient sound 400. The first microphone 110 is near the ambient sound collection location, and the second microphone 120 is near the vibration element 220. The first microphone 110 and the second microphone 120 are spaced apart from the sound sources of the noise 300 and the ambient sound 400, respectively, so that the sound inputs with different intensities can be received. Fig. 3 is a schematic diagram illustrating signal strength received by different microphones of the embodiment of fig. 1. Referring to fig. 3, taking the noise 300 with a frequency of 8KHz and the environmental sound 400 with a frequency of 13KHz as an example, since the first microphone 110 is far away from the vibrating element 220, the received noise 300 is small and close to the external sound source, so that the received environmental sound 400 is large. The second microphone 120 is closer to the vibration element 220, so that the received noise 300 is larger and is farther from the external sound source, so that it is smaller than the received environmental sound 400. The signal strength of the sound received by the first microphone 110 and the second microphone 120 is shown in fig. 3, and by comparing the sound received by the first microphone 110 and the second microphone 120, 8KHz can be distinguished as system noise, and 13KHz is the sound of the external environment, i.e. the sound source in the environment.
Fig. 4 is a schematic diagram illustrating the received signal strength of different microphones in practical application according to the embodiment of fig. 1. Referring to fig. 4, in practical applications, the sound frequency segment received by the microphone is continuous, as shown in fig. 1, fig. 2 and fig. 4. The first microphone 110 receives the noise 300 inside the casing 210 and the ambient sound 400 outside the casing 210 to generate a first sound signal S1, and the second microphone 120 receives the noise 300 inside the casing 210 and the ambient sound 400 outside the casing 210 to generate a second sound signal S2.
The first analog-to-digital converter circuit 140 receives the first sound signal S1 from the first microphone 110, converts the format of the first sound signal S1 from analog to digital, and passes the digital first sound signal S1 to the processor circuit 130. The second analog-to-digital converter circuit 150 receives the first sound signal S2 from the second microphone 120, converts the format of the second sound signal S2 from analog to digital, and passes the digital second sound signal S2 to the processor circuit 130. The processor circuit 130 receives a first sound signal S1 from the first microphone 110 through the first analog-to-digital converter circuit 140 and a second sound signal S2 from the second microphone 120 through the second analog-to-digital converter circuit 150. The processor circuit 130 calculates a difference between the first audio signal S1 and the second audio signal S2 to obtain an equalization gain EQ.
Because it is known that the ambient sound 400 received by the first microphone 110 is greater than the ambient sound 400 received by the second microphone 120, the noise 300 received by the second microphone 120 is greater than the noise 300 received by the first microphone 110. Therefore, the processor circuit 130 calculates a difference between the first audio signal S1 and the second audio signal S2 as the equalization gain EQ, and as shown in fig. 4, a positive portion of the first audio signal S1 and the second audio signal S2 subtracted from each other is the ambient sound 400, and a negative portion subtracted from each other is the noise 300. Therefore, the equalization gain EQ is positive in the first band BW1 and negative in the second band BW 2. The first band BW1 may be continuous or discontinuous and the second band BW2 may be continuous or discontinuous.
Fig. 5 is a schematic diagram illustrating an embodiment of adjusting the signal strength of the first audio signal by using the equalization gain in fig. 1. Referring to fig. 1, 4 and 5, the processor circuit 130 adjusts the first audio signal S1 according to the equalization gain EQ to generate a third audio signal S3. The equalization gain EQ is positive in the first band BW1 and negative in the second band BW 2. That is, in the first frequency band BW1, the processor circuit 130 enhances the first sound signal S1 according to the equalization gain EQ. In the second frequency band BW2, the processor circuit 130 attenuates the first sound signal S1 according to the equalization gain EQ and obtains a third sound signal S3 as shown in fig. 5.
Specifically, the intensity and the ratio of the noise 300 and the ambient sound 400 in the frequency domain can be obtained by subtracting the intensities of the first sound signal S1 and the second sound signal S2. This curve is defined as the equalization gain EQ for weighting the first sound signal S1, e.g. the third sound signal S3 is obtained by multiplying the first sound signal S1 by the equalization gain EQ. The third sound signal S3 is attenuated in the second band BW2 (the frequency domain where the system noise is strong) and enhanced in the first band BW1 (the frequency domain where the ambient sound is strong). The processor circuit 130 thereby reduces the noise of the first sound signal S1 and enhances the ambient sound of the first sound signal S1.
In the present embodiment, the third sound signal S3 is a modified signal, the noise of which has been attenuated and the ambient sound of which has been enhanced, and which can be used for recording, recognition and other applications. For example, the ambient sound 400 is, for example, a user 'S voice, and after the user' S voice is received through the first microphone 110, the processor circuit 130 adjusts and generates the third sound signal S3, i.e., a sound signal with enhanced voice, according to the equalization gain EQ. The electronic device 200 may include a storage unit (not shown) for storing the third sound signal S3 adjusted by the processor circuit 130, so as to record the third sound signal S3 with noise filtered; the electronic device 200 may include a voice recognition unit (not shown) for performing a voice recognition operation on the third sound signal S3. The third sound signal S3 has been filtered to remove noise, so that the accuracy of speech recognition can be greatly improved.
The electronic device 200 with the noise reduction system 100 may also be used for instant messaging, such as a voice conference room system and an in-vehicle instant messaging system. The communication unit of the conference room system or the instant messaging system is connected to the electronic device 200, and the third sound signal S3 processed by the noise reduction system 100 can be sent to the cloud exchange system for instant messaging, and the processed third sound signal S3 can be used to filter out noise (system noise, music in the car), thereby greatly improving the communication quality.
FIG. 6 is a flowchart illustrating a noise reduction method according to an embodiment of the invention. Referring to fig. 1 and fig. 6, the noise reduction method of the present embodiment is at least applied to the noise reduction system 100 of fig. 1 and the electronic device 200 of fig. 2, but the present invention is not limited thereto. In step S100, a first sound signal S1 is generated through the first microphone 110. In step S110, a second sound signal S2 is generated through the second microphone 120. In step S120, the processor circuit 130 calculates a difference between the first audio signal S1 and the second audio signal S2 to obtain an equalization gain EQ. In step S130, the processor circuit 130 adjusts the first audio signal S1 according to the equalization gain EQ to generate a third audio signal S3. In addition, the noise reduction method of the embodiment of the present invention can be obtained from the description of the embodiment of fig. 1 to 5 to obtain sufficient teaching, suggestion and implementation description.
In summary, the embodiments of the invention have at least one of the following advantages or effects. The processor circuit adjusts the first sound signal according to the equalization gain to generate a third sound signal. The third sound signal is a modified signal whose noise has been attenuated and whose speech signal has been enhanced. In a noisy space, the noise reduction method of the embodiment of the invention can be used for filtering noise and enhancing signal quality. In the car phone for playing music, the noise reduction system of the embodiment of the invention can be used for judging the sound of music or human speech, reducing the weighting of music, strengthening the human speech weighting and improving the conversation quality. In a system device with a microphone, such as a built-in microphone of a projector, the noise reduction method of the embodiment of the invention can be used for filtering noises such as a fan, a rotating wheel and the like, and enhancing the signal quality. In devices playing and receiving the same system, such as mobile phones, radio recorders, etc., the noise reduction method of the embodiment of the present invention can be used to reduce echo.
However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the summary of the invention are still included in the scope of the present invention. Furthermore, it is not necessary for any embodiment or claim of the invention to address all of the objects, advantages, or features disclosed herein. In addition, the abstract and the title of the invention are provided for assisting the search of patent documents and are not intended to limit the scope of the invention. Furthermore, the terms "first", "second", and the like in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used to limit upper or lower limits on the number of elements.
Description of reference numerals:
100: noise reduction system
110: first microphone
120: second microphone
130: processor circuit
140: first analog-to-digital converter circuit
150: second analog-to-digital converter circuit
200: electronic device
210: shell body
220: vibrating element
300: noise (F)
400: ambient sound
BW 1: first frequency band
BW 2: second frequency band
EQ: equalizing gain
S1: a first sound signal
S2: second sound signal
S3: third sound signal
S100, S110, S120, S130: and (5) carrying out the following steps.
Claims (10)
1. A noise reduction system for an electronic device, the electronic device comprising a housing, the noise reduction system comprising a first microphone, a second microphone, and a processor circuit, wherein,
the first microphone is arranged in the shell and used for generating a first sound signal;
the second microphone is arranged in the shell and is far away from the shell relative to the first microphone, and is used for generating a second sound signal; and
the processor circuit is coupled to the first microphone and the second microphone and receives the first sound signal from the first microphone and the second sound signal from the second microphone, and is configured to calculate a difference between the first sound signal and the second sound signal to obtain an equalization gain, and adjust the first sound signal according to the equalization gain to generate a third sound signal.
2. The noise reduction system of claim 1, wherein the equalization gain is positive in a first frequency band in which the first sound signal is enhanced in accordance with the equalization gain, and negative in a second frequency band in which the first sound signal is attenuated in accordance with the equalization gain.
3. The noise reduction system of claim 1, wherein the electronic device further comprises at least one vibration element disposed within the housing, and wherein the first microphone is disposed distal from the at least one vibration element relative to the second microphone, and the second microphone is disposed proximal to the at least one vibration element relative to the first microphone.
4. The noise reduction system of claim 3, wherein the at least one vibration element generates noise, and wherein the first microphone receives the noise and ambient sound outside the housing to generate the first acoustic signal, and wherein the second microphone receives the noise and ambient sound outside the housing to generate the second acoustic signal.
5. The noise reduction system of claim 3, wherein the electronic device is a projector, and the at least one vibration element is a fan, a color filter wheel, a phosphor wheel, or a motor for driving a projection lens to focus and focus.
6. The noise reduction system of claim 1, further comprising:
a first analog-to-digital converter circuit coupled between the first microphone and the processor circuit for converting the format of the first sound signal from analog to digital and passing the digital first sound signal to the processor circuit; and
a second analog-to-digital converter circuit coupled between the second microphone and the processor circuit for converting the format of the second sound signal from analog to digital and passing the digital second sound signal to the processor circuit.
7. A noise reduction method for an electronic device, the electronic device comprising a housing and a noise reduction system disposed in the housing, the noise reduction system comprising a first microphone, a second microphone, and a processor circuit, the noise reduction method comprising:
generating a first sound signal through the first microphone;
generating a second sound signal through the second microphone;
calculating a difference between the first audio signal and the second audio signal by the processor circuit to obtain an equalization gain; and
adjusting the first audio signal according to the equalization gain through the processor circuit to generate a third audio signal.
8. The method of claim 7, wherein the step of adjusting the first audio signal by the processor circuit according to the equalization gain to generate the third audio signal comprises:
in a first frequency band, the first sound signal is enhanced according to the equalization gain; and
in a second frequency band, the first sound signal is attenuated according to the equalization gain, wherein the equalization gain is positive in the first frequency band and negative in the second frequency band.
9. The method of reducing noise according to claim 7, wherein the electronic device further comprises at least one vibrating element disposed in the housing, the at least one vibrating element generating noise, and the step of generating the first acoustic signal via the first microphone comprises:
the first microphone receives the noise and the environmental sound outside the shell to generate the first sound signal.
10. The noise reduction method according to claim 9, wherein the step of generating the second sound signal through the second microphone comprises:
the second microphone receives the noise and the ambient sound outside the housing to generate the second sound signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910572176.7A CN112153505A (en) | 2019-06-28 | 2019-06-28 | Noise reduction system and noise reduction method |
| TW108126251A TWI706408B (en) | 2019-06-28 | 2019-07-24 | System and method for reducing noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910572176.7A CN112153505A (en) | 2019-06-28 | 2019-06-28 | Noise reduction system and noise reduction method |
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| Publication Number | Publication Date |
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| CN112153505A true CN112153505A (en) | 2020-12-29 |
Family
ID=73869065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910572176.7A Pending CN112153505A (en) | 2019-06-28 | 2019-06-28 | Noise reduction system and noise reduction method |
Country Status (2)
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| CN (1) | CN112153505A (en) |
| TW (1) | TWI706408B (en) |
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| WO2012165657A1 (en) * | 2011-06-03 | 2012-12-06 | 日本電気株式会社 | Speech processing system, speech processing device, speech processing method, and program therefor |
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| CN109215676A (en) * | 2017-07-07 | 2019-01-15 | 骅讯电子企业股份有限公司 | The voice device and dual microphone voice system eliminated with noise |
| CN209914013U (en) * | 2019-06-28 | 2020-01-07 | 中强光电股份有限公司 | Noise reduction system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017074321A1 (en) * | 2015-10-27 | 2017-05-04 | Ambidio, Inc. | Apparatus and method for sound stage enhancement |
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2019
- 2019-06-28 CN CN201910572176.7A patent/CN112153505A/en active Pending
- 2019-07-24 TW TW108126251A patent/TWI706408B/en not_active IP Right Cessation
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| US20090089053A1 (en) * | 2007-09-28 | 2009-04-02 | Qualcomm Incorporated | Multiple microphone voice activity detector |
| US20120259629A1 (en) * | 2011-04-11 | 2012-10-11 | Kabushiki Kaisha Audio-Technica | Noise reduction communication device |
| WO2012165657A1 (en) * | 2011-06-03 | 2012-12-06 | 日本電気株式会社 | Speech processing system, speech processing device, speech processing method, and program therefor |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI706408B (en) | 2020-10-01 |
| TW202101429A (en) | 2021-01-01 |
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Application publication date: 20201229 |