CN210403192U - Four-channel audio small signal conditioner - Google Patents
Four-channel audio small signal conditioner Download PDFInfo
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- CN210403192U CN210403192U CN201920716889.1U CN201920716889U CN210403192U CN 210403192 U CN210403192 U CN 210403192U CN 201920716889 U CN201920716889 U CN 201920716889U CN 210403192 U CN210403192 U CN 210403192U
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- 230000005236 sound signal Effects 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 230000003321 amplification Effects 0.000 claims abstract description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000003491 array Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 2
- 230000003750 conditioning effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a four-channel audio frequency small signal conditioner, the signal conditioner of being applied to in microphone array positioning system and the beam forming design very much. In order to solve the problem of sound signal distortion caused by noise interference and circuit influence, the design adopts four groups of identical circuits to process signals, and each group of circuits consists of a direct current voltage conversion circuit, a constant current circuit, a filter circuit, a gain adjustable amplification circuit and an adjustable direct current bias circuit. The direct current voltage conversion circuit generates +12V and-12V to enable the amplifier to work, the cross current circuit provides current to enable the microphone to work, the filter circuit is used for filtering noise doped with sound signals, the gain-adjustable amplification circuit is used for amplifying small sound signals in a controllable proportion, and the adjustable direct current bias circuit is used for adding direct current bias to the sound signals so as to be suitable for various ADCs and facilitate subsequent signal processing. The design idea is simple, the material is cheap, and the design method can be rapidly mastered and applied by designers.
Description
Technical Field
The utility model discloses a four-channel audio frequency small signal conditioner, the signal conditioner of being applied to in microphone array positioning system and the beam forming design very much.
Background
In the field of electronic technology, a four-channel audio small signal conditioner needs to filter noise of an input audio small signal, perform adjustable amplification on an effective audio signal and increase direct current bias so as to facilitate signal output, and simultaneously provide constant current at an input end for microphone operation. Referring to fig. 1, the four-channel audio small signal conditioner includes a constant current circuit, a filter circuit for conditioning a signal of a signal source, an adjustable gain amplifier circuit, and an adjustable dc bias circuit.
When the filter circuit is designed, the design of the band-pass filter is adopted, and in order to achieve a better noise filtering effect, higher-order filtering is adopted, accordingly, when a better filtering effect is pursued, the design of the filter circuit becomes more complex, and the distortion condition of an output signal has influence on the gain of the circuit, influences the signal output and is not beneficial to the signal processing in the later period.
Disclosure of Invention
In order to solve the technical problem, four groups of identical circuits are adopted to process signals, band-pass filtering with an eight-order multi-path feedback structure is adopted to achieve a good filtering effect, and a gain adjustable amplifying circuit and an adjustable direct current bias circuit are added to enable a good signal to be output.
The utility model provides a technical scheme of above-mentioned technical problem is: four groups of identical circuits are adopted to process signals, and each group of circuits consists of a direct current voltage conversion circuit, a constant current circuit, a filter circuit, a gain adjustable amplification circuit and an adjustable direct current bias circuit.
The filter circuit is a Chebyshev-type band-pass filter with an eight-order multi-channel feedback structure consisting of an operational amplifier, a resistor and a capacitor, the bandwidth of the Chebyshev-type band-pass filter is 280Hz to 4000Hz, the Chebyshev-type band-pass filter well comprises audio signals of 300Hz to 3400Hz, in addition, clutter can be effectively attenuated, a good filtering effect is further achieved, and the filtered audio signals are correspondingly subjected to adjustable undistorted amplification and conditioning of direct current bias after filtering, so that the Chebyshev-type band-pass filter is suitable for various ADCs and is convenient for subsequent. In addition, the DC voltage conversion circuit generates +12V and-12V to operate the amplifier, and the constant current circuit supplies current to operate the microphone.
The utility model provides a four-channel audio small signal conditioner its advantage lies in:
(1) the design realizes good conditioning effect on audio signals through filtering, gain adjustable amplification and adjustable direct current bias, and meanwhile, the design is low in material cost and suitable for medium and low-end audio conditioning.
(2) The design idea is simple, and the design is realized clearly, can be mastered and applied by the designer fast.
Drawings
FIG. 1 is a schematic diagram of a four-channel audio small signal conditioner
FIG. 2 is a circuit diagram of a Chebyshev-type band-pass filter with an eight-order multi-path feedback structure
FIG. 3 shows a constant current source generating circuit
Detailed Description
Fig. 1 illustrates an embodiment of the present invention.
The direct-current voltage conversion circuit is a circuit consisting of a dc-dc chip, a resistor, a capacitor and an inductor so as to output direct-current voltages of +12V and-12V for the work of the amplifier; the constant current circuit is a voltage-controlled constant current source consisting of an FET and a resistor and is used for providing current for the microphone. The filter circuit is a Chebyshev-type band-pass filter with an eight-order multi-path feedback structure consisting of an operational amplifier, a resistor and a capacitor and is used for filtering clutter in the small sound signals; the gain adjustable amplifying circuit is a proportional amplifier with adjustable proportion and composed of an operational amplifier, a resistor and a potentiometer, and is used for amplifying small sound signals; the adjustable direct current bias circuit is an addition circuit of adjustable bias voltage consisting of an operational amplifier, a resistor and a potentiometer, and is used for increasing direct current bias for the audio small signal, so that subsequent signal processing is facilitated.
In the implementation process, a constant current source is designed according to the designed constant current source circuit, constant current is input into the microphone, the microphone works, four channels of the microphone receive signals and serve as signal source input filter circuits, the input of each frequency is changed, input and output signals are observed through an oscilloscope, the waveform is good, no obvious clutter interference exists basically, and the bandwidth is similar to the designed bandwidth.
And the output of the signal after passing through the gain adjustable amplifying circuit is observed, the rheostat is adjusted, the waveform change is observed, and the signal can be effectively amplified without distortion. When the amplification factor is larger, the signal can be received and effectively amplified when the amplification factor is far away from the microphone. Finally, the change of the output waveform is observed through an adjustable direct current bias circuit, so that the bias of the signal is realized, and the whole embodiment process is completed.
Claims (2)
1. The four-channel audio small signal conditioner is characterized by comprising four groups of completely same circuits for receiving signals of four microphone arrays, wherein the four circuits of audio small signals received by the four microphone arrays are processed by adopting a direct-current voltage conversion circuit, a constant-current circuit, a filter circuit, a gain-adjustable amplification circuit and an adjustable direct-current bias circuit, the four circuits of audio small signals subjected to same processing are output for subsequent processing, the filter circuit is an eight-order multi-channel feedback structure Chebyshev type band-pass filter, and meanwhile, constant current is provided at an input end for the microphone to work.
2. The four-channel audio small signal conditioner of claim 1, characterized in that: the direct-current voltage conversion circuit is a circuit consisting of a dc-dc chip, a resistor, a capacitor and an inductor so as to output direct-current voltages of +12V and-12V for the work of the amplifier; the constant current circuit is a voltage-controlled constant current source consisting of an FET and a resistor and is used for providing current for the microphone; the filter circuit is a band-pass filter consisting of an operational amplifier, a resistor and a capacitor and is used for filtering clutter in the small sound signals; the gain adjustable amplifying circuit is a proportional amplifier with adjustable proportion and composed of an operational amplifier, a resistor and a potentiometer, and is used for amplifying small sound signals; the adjustable direct current bias circuit is an adjustable bias voltage addition circuit consisting of an operational amplifier, a resistor and a potentiometer and used for adding direct current bias to the audio small signal so as to facilitate subsequent signal processing, and each group of circuits consists of a direct current voltage conversion circuit, a constant current circuit, a filter circuit, a gain adjustable amplification circuit and an adjustable direct current bias circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920716889.1U CN210403192U (en) | 2019-05-17 | 2019-05-17 | Four-channel audio small signal conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920716889.1U CN210403192U (en) | 2019-05-17 | 2019-05-17 | Four-channel audio small signal conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210403192U true CN210403192U (en) | 2020-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920716889.1U Expired - Fee Related CN210403192U (en) | 2019-05-17 | 2019-05-17 | Four-channel audio small signal conditioner |
Country Status (1)
| Country | Link |
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| CN (1) | CN210403192U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022006862A1 (en) * | 2020-07-10 | 2022-01-13 | 深圳市速腾聚创科技有限公司 | Laser receiving circuit and laser radar |
-
2019
- 2019-05-17 CN CN201920716889.1U patent/CN210403192U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022006862A1 (en) * | 2020-07-10 | 2022-01-13 | 深圳市速腾聚创科技有限公司 | Laser receiving circuit and laser radar |
| US11835650B2 (en) | 2020-07-10 | 2023-12-05 | Suteng Innovation Technology Co., Ltd. | Laser receiving circuit and LiDAR wherein the reverse DC voltage signals from a DC bias circuit and the AC voltage signals from an amplifier circuit are superimposed |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Wu Xiaoguang Document name: Notice of termination of patent right |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200424 |