CN109548410A - Audio signal sample circuit - Google Patents
Audio signal sample circuit Download PDFInfo
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- CN109548410A CN109548410A CN201680003162.8A CN201680003162A CN109548410A CN 109548410 A CN109548410 A CN 109548410A CN 201680003162 A CN201680003162 A CN 201680003162A CN 109548410 A CN109548410 A CN 109548410A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The present invention provides a kind of audio signal sample circuit, including the first processing chip, second processing chip, first filtering sub-circuit and the second filtering sub-circuit, the input terminal of the second processing chip is connect with the first processing chip and the first filtering sub-circuit, the output end of the second processing chip is connect with the second filtering sub-circuit, the first processing chip includes first order amplifier comparator and filter, the second processing chip includes second level amplifier comparator, after the first processing chip carries out first order amplification and filtering processing to sound wave analog signal, it is input to the second level amplifier comparator.
Description
The present invention relates to signal processing circuit more particularly to a kind of audio signal sample circuits.
On existing electronic product, the technology that ultrasonic wave control is applied on household electrical appliances is relatively fewer.In product currently on the market, mainly there is more application to receive on circuit in building intelligent, intercom and communication telephone equipment to audio.
It, can be when receiving the acoustic signals of secondary noise (be lower than 20KHz) rank in existing voicefrequency circuit, the phenomenon that appearance cannot detect analog signal.It or is, since received interference signal is excessive, to generate the case where detection malfunctions.The generation of above situation, it is often as when amplifying circuit acquires acoustic signals, not by the overanxious clutter of a series of optimization algorithm and interference, lead to that better effect is not achieved on the acquisition precision to signal, so that quality of output signals is poor, and there is the problems such as processing chip power-consumption is excessive.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of audio signal sample circuit.
A kind of audio signal sample circuit provided in an embodiment of the present invention, including the first processing chip, second processing chip, the first filtering sub-circuit and the second filtering sub-circuit.The input terminal of the second processing chip is connect with the first processing chip and the first filtering sub-circuit, the output end of the second processing chip is connect with the second filtering sub-circuit, the first processing chip includes first order amplifier comparator and filter, the second processing chip includes second level amplifier comparator, after the first processing chip carries out first order amplification and filtering processing to sound wave analog signal, it is input to the second level amplifier comparator.
Audio signal sample circuit of the invention, since the signal for acquiring microphone carries out algorithm optimization by the first processing chip in advance, it is compared and enlarged in second processing chip again, so that signal acquisition amplification compared with signal is separated, to reduce the signal output process by triode amplifier, reduce circuit, saves space and cost.Meanwhile being built using discrete component, structure is simple, and occupancy pcb board subspace is small, saves cost, effectively plays the accurate and high efficiency of sound collection, reduce the damage of product
Bad rate improves the competitiveness of product in market.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, the drawings to be used in the description of the embodiments or prior art will be briefly described below, apparently, drawings in the following description are only some embodiments of the invention, for those of ordinary skill in the art, without any creative labor, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram of audio signal sample circuit provided in an embodiment of the present invention.
Further more detailed description is made to technical solution of the present invention with reference to the accompanying drawings and detailed description.Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art's every other embodiment obtained without creative labor, all should belong to the scope of protection of the invention.
As shown in Figure 1, the present invention provides a kind of audio signal sample circuit 100 comprising the first processing chip 10, second processing chip 20, first filter sub-circuit 30 and the second filtering sub-circuit 40.The input terminal of the second processing chip 20 is connect with the first processing chip 10 and the first filtering sub-circuit 30, the output end of the second processing chip 20 is connect with the second filtering sub-circuit 40, the first processing chip 10 includes first order amplifier comparator and filter (not shown), the second processing chip 20 includes second level amplifier comparator (not shown), after the first processing chip 10 carries out first order amplification and filtering processing to sound wave analog signal, it is input to the second level amplifier comparator.
Specifically, the first filtering sub-circuit 30 includes power end VCC, first resistor R1, second resistance R2 and first capacitor C1, the first resistor R1 is connected between the power end VCC and the second resistance R2, one end of the second resistance R2 is grounded, the first capacitor C1 and the second resistance R2 earth.In the present embodiment, the size of the first resistor R1 and second resistance R2 are 10K Ω, and the size of the first capacitor C1 is 106PF.
The second processing chip 20 includes first input end IN1+, the second input terminal IN1-, third input terminal IN2+, the 4th input terminal IN2-, the first output end OUT1, second output terminal OUT2, power end VCC and ground terminal GND, the first input end IN1+ is connect by a 3rd resistor R3 with the first processing chip 10, and it is connected between the first resistor R1 and second resistance R2 by one the 4th resistance R4
The second input terminal IN1- filters sub-circuit 50 and the 4th input terminal IN2- by a third, second output terminal OUT2 and the second filtering sub-circuit 40 connect, the third input terminal IN2+ passes through one second capacitor C2 and the second filtering sub-circuit 40, and it is connected between the first capacitor C1 and the 4th resistance R4 by one the 5th resistance R5, the 4th input terminal IN2- is connect with the second filtering sub-circuit 40, the first output end OUT1 filters sub-circuit 50 with the third and the first processing chip 10 is connect, the second output terminal OUT2 is connect with the second filtering sub-circuit 40, the power end VCC is connect with power supply device (not shown), the ground terminal GND ground connection.In the present embodiment, the 5th resistance R5 plays the role of the gain adjustment of signal, and the size of the 3rd resistor R3 is 10.2K Ω, the size of the 4th resistance R4 is 1K Ω, the size of the 5th resistance R5 is 50K Ω, the size of the second capacitor C2 is 220PF.
The second filtering sub-circuit 40 includes the 6th resistance R6 and third capacitor C3, one end of the 6th resistance R6 is separately connected the 4th input terminal IN2-, the second output terminal OUT2 of the second processing chip 20 and one end of one the 7th resistance R7, the other end of the 6th resistance R6 is separately connected the third capacitor C3 and the second capacitor C2, the third capacitor C3 is connect with the first processing chip 10, and the other end of the 7th resistance R7 is connect with third filtering sub-circuit 50.In the present embodiment, the size of the 6th resistance R6 is 23K Ω, and the size of the 7th resistance R7 is 9K Ω, and the size of the third capacitor C3 is 220PF.
The third filtering sub-circuit 50 includes the 4th capacitor C4 and the 5th capacitor C5 for being connected in parallel on the other end of the 7th resistance R7, and it is connected to the 8th resistance R8 between the 4th capacitor C4 and the 5th capacitor C5, one end of the 8th resistance R8 is connect with the first output end OUT1.In the present embodiment, the size of the 4th capacitor C4 and the 5th capacitor C5 is 220PF, and the size of the 8th resistance R8 is 120K Ω.
The course of work of the audio signal sample circuit 100 is as follows:
The collected sound wave analog signal of microphone is input in the first processing chip 10 by the end universal input/output (GPIO), after writing algorithm amplification and filtering using the internal processes of the first processing chip 10, from input (IN) pin of the first processing chip 10, pass through the first input end IN1+ of 3rd resistor R3 output analog signal to second processing chip 20.At the same time, power supply enters first input end IN1+ by the 4th resistance R4 after first resistor R1, second resistance R2, first capacitor C1 partial pressure and RC filtering.In addition, the signal of microphone acquisition enters the second input terminal IN1- of second processing chip 20 also by 3rd resistor R3 after the algorithm optimization processing of the first processing chip 10.The first input end IN1+ and second
After comparison of the signal of input terminal IN1- by the comparator of second processing chip 20, from the 7th resistance R7 output signal.
Audio signal sample circuit 100 of the invention, since the signal for acquiring microphone carries out algorithm optimization by the first processing chip 10 in advance, it is compared and enlarged in second processing chip 20 again, so that signal acquisition amplification compared with signal is separated, to reduce the signal output process by triode amplifier, reduce circuit, saves space and cost.Meanwhile being built using discrete component, structure is simple, and occupancy pcb board subspace is small, saves cost, effectively plays the accurate and high efficiency of sound collection, reduces the spoilage of product, improves the competitiveness of product in market.
Above disclosed is only the preferred embodiment in the embodiment of the present invention, and of course, the scope of rights of the present invention cannot be limited by this, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (5)
- A kind of audio signal sample circuit, including the first processing chip, second processing chip, first filtering sub-circuit and the second filtering sub-circuit, the input terminal of the second processing chip is connect with the first processing chip and the first filtering sub-circuit, the output end of the second processing chip is connect with the second filtering sub-circuit, the first processing chip includes first order amplifier comparator and filter, the second processing chip includes second level amplifier comparator, after the first processing chip carries out first order amplification and filtering processing to sound wave analog signal, it is input to the second level amplifier comparator.
- Audio signal sample circuit as described in claim 1, it is characterized in that, the first filtering sub-circuit includes power end, first resistor, second resistance and first capacitor, the first resistor is connected between the power end and the second resistance, one end of the second resistance is grounded, the first capacitor and the second resistance earth.
- Audio signal sample circuit as claimed in claim 2, it is characterized in that, the second processing chip includes first input end, second input terminal, third input terminal, 4th input terminal, first output end, second output terminal, power end and ground terminal, the first input end is connect by a 3rd resistor with the first processing chip, and it is connected between the first resistor and second resistance by one the 4th resistance, second input terminal filters sub-circuit and the 4th input terminal by a third, second output terminal and the second filtering sub-circuit connection, the third input terminal passes through one second capacitor and the second filtering sub-circuit, and it is connected between the first capacitor and the 4th resistance by one the 5th resistance, 4th input terminal is connect with the second filtering sub-circuit, first output end with it is described Third filters sub-circuit and the first processing chip connection, the second output terminal are connect with the second filtering sub-circuit, and the power end is connect with power supply device, the ground terminal ground connection.
- Audio signal sample circuit as claimed in claim 3, it is characterized in that, the second filtering sub-circuit includes the 6th resistance and third capacitor, one end of 6th resistance is separately connected one end of the 4th input terminal of the second processing chip, second output terminal and one the 7th resistance, the other end of 6th resistance is separately connected the third capacitor and second capacitor, the third capacitor is connect with the first processing chip, and the other end of the 7th resistance is connect with third filtering sub-circuit.
- Audio signal sample circuit as claimed in claim 4, it is characterized in that, the third filtering sub-circuit includes the 4th capacitor and the 5th capacitor for being connected in parallel on the other end of the 7th resistance, and it is connected to the 8th resistance between the 4th capacitor and the 5th capacitor, one end of the 8th resistance is connect with first output end.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/081915 WO2017193345A1 (en) | 2016-05-12 | 2016-05-12 | Audio signal acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109548410A true CN109548410A (en) | 2019-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680003162.8A Pending CN109548410A (en) | 2016-05-12 | 2016-05-12 | Audio signal sample circuit |
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| Country | Link |
|---|---|
| CN (1) | CN109548410A (en) |
| WO (1) | WO2017193345A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108989949B (en) * | 2018-10-09 | 2023-10-10 | 佛山市新东方电子技术工程有限公司 | Multichannel interlocking micro-sound pickup device |
| CN113820595A (en) * | 2021-06-28 | 2021-12-21 | 乐歌人体工学科技股份有限公司 | Knocking frequency detection system and method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7649417B1 (en) * | 2007-05-23 | 2010-01-19 | National Semiconductor Corporation | Apparatus and method for input stage and bias canceller for an audio operational amplifier |
| JP2010118975A (en) * | 2008-11-14 | 2010-05-27 | Nec Corp | Sound collector and method for suppressing noise |
| CN101958693A (en) * | 2009-07-13 | 2011-01-26 | 深圳富泰宏精密工业有限公司 | Volume-adjusting device and method |
| JP6119203B2 (en) * | 2012-11-13 | 2017-04-26 | ヤマハ株式会社 | Sound collecting device, sound collecting method and program |
| CN204206429U (en) * | 2014-08-22 | 2015-03-11 | 上海斐讯数据通信技术有限公司 | Audio signal processing |
| CN204666566U (en) * | 2015-06-10 | 2015-09-23 | 衢州立诺电子科技有限公司 | A kind of sound detection system |
| CN204836300U (en) * | 2015-06-24 | 2015-12-02 | 江苏米笛声学科技有限公司 | Mobile phone microphone ultrasonic wave system |
-
2016
- 2016-05-12 WO PCT/CN2016/081915 patent/WO2017193345A1/en active Application Filing
- 2016-05-12 CN CN201680003162.8A patent/CN109548410A/en active Pending
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| WO2017193345A1 (en) | 2017-11-16 |
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Application publication date: 20190329 |