CN218998237U - Sound acquisition circuit and microphone in vehicle navigation system voice recognition - Google Patents
Sound acquisition circuit and microphone in vehicle navigation system voice recognition Download PDFInfo
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- CN218998237U CN218998237U CN202320090380.7U CN202320090380U CN218998237U CN 218998237 U CN218998237 U CN 218998237U CN 202320090380 U CN202320090380 U CN 202320090380U CN 218998237 U CN218998237 U CN 218998237U
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Abstract
The utility model relates to a sound collection circuit and microphone in car navigation system speech recognition, sound collection circuit in car navigation system speech recognition includes speech information collection module and central processing module, speech information collection module with central processing module connects, speech information collection module includes microphone unit, low noise fortune is put unit and signal conversion unit, the microphone unit is used for carrying out the speech acquisition and exports corresponding difference analog signal, low noise fortune is put the unit and is used for right difference analog signal carries out fixed gain's amplification processing, signal conversion unit is used for converting difference analog signal into digital signal. The present application helps to reduce audio signal interference.
Description
Technical Field
The application relates to the technical field of audio acquisition, in particular to a sound acquisition circuit and a microphone in voice recognition of a vehicle navigation system.
Background
With the development of electronic technology, a voice acquisition system plays an important role in various industries, the voice acquisition system generally acquires voice information directly through a microphone, then inputs the voice information into an upper computer system, and the upper computer system recognizes the voice and executes operation corresponding to the voice.
In the related art, most of microphone output audio signals are analog signals and single-ended input, are easily interfered by external Electromagnetic (EMI), the audio signals are easily lost, and the PCB wiring is easily interfered to cause circuit noise to be superimposed on the audio signals, so that the audio signals are interfered.
Therefore, a sound collection circuit and a microphone in voice recognition of a car navigation system are needed.
Disclosure of Invention
Aiming at the problem that a voice acquisition circuit is easy to be interfered by an audio signal, the application provides a voice acquisition circuit and a microphone in voice recognition of a vehicle navigation system.
In a first aspect, the present application provides a sound collection circuit in vehicle navigation system speech recognition, the circuit includes speech information collection module and central processing module, speech information collection module with central processing module connects, speech information collection module includes microphone unit, low noise fortune is put unit and signal conversion unit, the microphone unit is used for carrying out speech acquisition and exporting corresponding differential analog signal, low noise fortune is put the unit and is used for right differential analog signal carries out fixed gain's amplification processing, signal conversion unit is used for converting differential analog signal into digital signal.
Through adopting above-mentioned technical scheme, the audio frequency analog signal that microphone unit gathered uses the difference analog signal to input low noise fortune to put the unit, makes speech signal's interference killing feature reinforcing through using the difference analog signal, and the less signal of intensity is difficult to lose, amplifies audio frequency analog signal in low noise fortune to put the unit for audio frequency analog signal's gain promotes and reduces the noise, can avoid introducing circuit noise and other device interference as far as possible when the difference analog signal input signal conversion unit.
Optionally, the low-noise operational amplifier unit includes a filter circuit, a low-noise operational amplifier circuit and a frequency response adjusting circuit, where the low-noise operational amplifier circuit is connected with the filter circuit and the frequency response adjusting circuit respectively.
Through adopting above-mentioned technical scheme, filter circuit carries out filtering clutter and reduces input noise with the audio frequency analog signal of input, and low noise operational amplifier circuit can audio frequency analog signal's gain to phase compensation's mode suppresses high frequency noise, avoids the less signal of intensity to appear losing or the circumstances of distortion as far as possible simultaneously, and frequency response regulating circuit is through reducing the peak value to replace the mode of filling the trough and adjusting the quality of sound.
Optionally, the low-noise operational amplifier circuit includes a first capacitor, a first resistor and an operational amplifier, where the first capacitor is connected in parallel with the first resistor, and two ends of the first capacitor are respectively connected with an inverting input end of the operational amplifier and an output end of the operational amplifier.
By adopting the technical scheme, the first capacitor is used for carrying out phase compensation on the audio analog signal in the low-noise operational amplifier circuit so as to prevent oscillation and inhibit high-frequency noise, and further reduce the distortion rate of the transmitted audio analog signal.
Optionally, the filter circuit includes a second capacitor and a third capacitor, two ends of the second capacitor are respectively connected with the first output end of the microphone unit and the inverting input end of the operational amplifier, and two ends of the third capacitor are respectively connected with the second output end of the microphone unit and the homodromous input end of the operational amplifier.
Through adopting above-mentioned technical scheme, through set up the input that the condenser was in order to reduce clutter and noise respectively at two output of microphone unit, through the bi-polar input of microphone unit in order to reduce outside external electromagnetic interference simultaneously, further promote the interference immunity of circuit.
Optionally, the frequency response adjusting circuit includes a fourth capacitor and a second resistor, where the fourth capacitor is connected in parallel with the second resistor, and two ends of the fourth capacitor are connected with the positive power supply end of the operational amplifier and the output end of the operational amplifier respectively.
By adopting the technical scheme, the frequency response adjusting circuit adjusts the flatness of the audio analog signal output by the operational amplification module so as to meet the requirement of a user on adjusting the quality of sound.
Optionally, the signal conversion unit is a digital signal processor.
Through adopting above-mentioned technical scheme, select as the signal conversion unit with digital signal processor can carry out preliminary processing with audio frequency analog signal in digital signal processor to reduce central processing module's work load, further promote the work efficiency of this circuit.
Optionally, the central processing module is an SOC chip.
Through adopting above-mentioned technical scheme, through the cooperation use of digital signal processor and SOC chip for SOC chip control architecture system promotes digital signal processor's data processing ability, guarantees speech output's stability, and promotes digital signal processor's analog-to-digital conversion ability, and then promotes user experience.
In a second aspect, the present application provides a microphone, the microphone including a sound collection circuit in speech recognition of a car navigation system according to any one of the first aspects.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the audio analog signals collected by the microphone unit are input into the low-noise operational amplifier unit by using the differential analog signals, the anti-interference capability of the voice signals is enhanced by using the differential analog signals, the signals with smaller strength are not easy to lose, the audio analog signals are amplified in the low-noise operational amplifier unit, the gain of the audio analog signals is improved, the noise is reduced, and when the differential analog signals are input into the signal conversion unit, the circuit noise and other device interference can be avoided as much as possible;
2. the filter circuit filters clutter from an input audio analog signal and reduces input noise, the low-noise operational amplifier circuit can control high-frequency noise in a gain and phase compensation mode of the audio analog signal, meanwhile, the condition that signals with smaller intensity are lost or distorted is avoided as much as possible, and the frequency response adjusting circuit adjusts the quality of sound in a mode of filling up trough by reducing peak values.
Drawings
Fig. 1 is a block diagram of a sound collection circuit in voice recognition of a car navigation system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a sound collection circuit in voice recognition of a car navigation system according to an embodiment of the present application;
fig. 3 is a circuit diagram of a sound collection circuit in voice recognition of the car navigation system according to the embodiment of the present application.
Reference numerals illustrate: 1. a voice information acquisition module; 11. a microphone unit; 12. a low noise operational amplifier unit; 121. a filter circuit; 122. a low noise operational amplifier circuit; 123. a frequency response adjusting circuit; 13. a signal conversion unit; 2. and a central processing module.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-3. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, the embodiment of the application provides a sound collection circuit in vehicle navigation system voice recognition, including a voice information collection module 1 and a central processing module 2, the voice information collection module 1 is connected with the central processing module 2, the voice information collection module 1 includes a microphone unit 11, a low noise operational amplifier unit 12 and a signal conversion unit 13, the microphone unit 11 is used for performing voice collection and outputting corresponding differential analog signals, the low noise operational amplifier unit 12 is used for performing fixed gain amplification processing on the differential analog signals, and the signal conversion unit 13 is used for converting the differential analog signals into digital signals.
The audio analog signal collected by the microphone unit 11 is input into the low-noise operational amplifier unit 12 by using the differential analog signal, the anti-interference capability of the voice signal is enhanced by using the differential analog signal, the signal with smaller strength is not easy to lose, the audio analog signal is amplified in the low-noise operational amplifier unit 12, the gain of the audio analog signal is improved, the noise is reduced, and the introduction of circuit noise and the interference of other devices can be avoided as much as possible when the differential analog signal is input into the signal conversion unit 13.
In one example, the differential analog signal is transmitted to the low noise op-amp circuit 122 simultaneously through both outputs of the microphone unit 11 such that the immunity of the transmitted audio analog signal is enhanced. In the signal transmission process, interference noise is generally equivalent and is simultaneously loaded on two signal lines, and the difference value is 0, namely, the noise does not affect the logic meaning of the signal, and electromagnetic interference (EMI) can be effectively restrained, so that the effect of reducing the noise is achieved. Because the two transmission lines are close to each other and the signal amplitudes are equal in dual-mode transmission, the amplitude of the coupling electromagnetic field between the two lines and the ground line is also equal, and the signal polarities of the coupling electromagnetic fields are opposite, the electromagnetic fields cancel each other, and therefore the electromagnetic interference to the outside is small.
The low-noise operational amplifier unit 12 in this embodiment includes a filter circuit 121, a low-noise operational amplifier circuit 122, and a frequency response adjusting circuit 123, and the low-noise operational amplifier circuit 122 is connected to the filter circuit 121 and the frequency response adjusting circuit 123, respectively.
The filtering circuit 121 filters clutter from an input audio analog signal and reduces input noise, the low-noise op-amp circuit 122 can suppress high-frequency noise in a phase compensation mode, and meanwhile, the situation that a signal with smaller intensity is lost or distorted is avoided as much as possible, and the frequency response adjusting circuit 123 adjusts the quality of sound by reducing peaks to replace a filling trough mode.
In this embodiment, the signal conversion unit 13 is a digital signal processor (Digital Signal Processing, DSP), i.e. a DSP chip, wherein the signal of the DSP chip may be an AK7377 chip or a KT148A chip. Or the signal conversion unit 13 may be a digital-to-analog conversion chip, such as an ADC122S101 chip, or the like.
After the audio analog signal passes through the low-noise operational amplifier circuit 122 and the frequency response adjusting circuit 123, the gain and the frequency response of the audio analog signal are adjusted to realize gain adjustment and frequency response control of the microphone signal, and then the processed audio analog signal in the microphone signal is input into the digital signal processor for further processing.
In this embodiment, the central processing module 2 is an SOC chip. Through the cooperation of digital signal processor and SOC chip, make SOC chip control architecture system, promote digital signal processor's data processing ability, guarantee speech output's stability to promote digital signal processor's analog-to-digital conversion ability, and then promote user experience. The SOC chip model may be RTL8762CJF.
In this embodiment, the low-noise operational amplifier 122 includes a first capacitor, a first resistor and an operational amplifier, wherein the first capacitor is connected in parallel with the first resistor, and two ends of the first capacitor are respectively connected with an inverting input end of the operational amplifier and an output end of the operational amplifier. The filter circuit 121 includes a second capacitor and a third capacitor, wherein two ends of the second capacitor are respectively connected with the first output end of the microphone unit 11 and the inverting input end of the operational amplifier, and two ends of the third capacitor are respectively connected with the second output end of the microphone unit 11 and the same-directional input end of the operational amplifier. The frequency response adjusting circuit 123 includes a fourth capacitor and a second resistor, where the fourth capacitor is connected in parallel with the second resistor, and two ends of the fourth capacitor are connected to the positive power supply end of the operational amplifier and the output end of the operational amplifier, respectively.
The two output ends of the microphone unit 11 are respectively provided with a capacitor to reduce the input of clutter and noise, and simultaneously, the two ends of the microphone unit 11 are input to reduce external electromagnetic interference, so that the anti-interference performance of the circuit is further improved; the first capacitor is used in the low-noise operational amplifier circuit 122 to perform phase compensation on the audio analog signal so as to prevent oscillation and inhibit high-frequency noise, thereby reducing the distortion rate of the transmitted audio analog signal; the frequency response adjusting circuit 123 adjusts the flatness of the audio analog signal output by the operational amplification module, so as to meet the requirement of a user for adjusting the quality of the sound.
Referring to fig. 3, a specific circuit structure of the sound collection circuit will be described in detail
In one possible example, the low noise op-amp unit 12 includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an op-amp U1, a DSP chip, an SOC chip, and an audio signal input.
The first capacitor corresponds to the capacitor C1, the second capacitor corresponds to the capacitor C2, the third capacitor corresponds to the capacitor C3, the fourth capacitor corresponds to the capacitor C5, the first resistor corresponds to the resistor R1, the second resistor corresponds to the resistor R4, the operational amplifier corresponds to the operational amplifier U1, the audio signal input terminal corresponds to the microphone unit 11, the dsp chip corresponds to the signal conversion unit 13, and the SOC chip corresponds to the central processing module 2.
The MIC+ end of the audio signal input end is connected with the first end of a capacitor C2, the MIC-end of the audio signal input end is connected with the first end of a capacitor C3, the second end of the capacitor C2 is connected with the first end of a resistor R2, the second end of the capacitor C3 is connected with the reverse input end of an operational amplifier U1, the first end of the capacitor C1 and the first end of the resistor R1 respectively, the second end of the resistor R3 is connected with the same-direction input end of the operational amplifier U1 and the first end of a resistor R5 respectively, the second end of the resistor R5 is connected with the REF end, the first end of the capacitor C4 is connected with the output end of the operational amplifier U1, the second end of the capacitor C1 and the second end of the resistor R1 respectively, the second end of the capacitor C4 is connected with the MIC+ end of a DSP chip, the first end of the capacitor C5 and the first end of the resistor R4 respectively, the first end of the capacitor C6, the second end of the capacitor C5 and the positive end of the resistor U1 are connected with the common ground of the DSP chip, and the second end of the DSP chip is connected with the positive end of the power supply chip.
The embodiment of the application also provides a microphone, wherein the microphone comprises the sound collection circuit in the voice recognition of the vehicle navigation system.
The utility model provides a sound collection circuit and a microphone in voice recognition of a vehicle navigation system, which comprises a voice information collection module 1 and a central processing module 2, wherein the voice information collection module 1 is connected with the central processing module 2, the voice information collection module 1 comprises a microphone unit 11, a low-noise operational amplifier unit 12 and a signal conversion unit 13, the microphone unit 11 is used for collecting voice and outputting corresponding differential analog signals, the low-noise operational amplifier unit 12 is used for carrying out fixed gain amplification processing on the differential analog signals, and the signal conversion unit 13 is used for converting the differential analog signals into digital signals. The utility model can reduce the inherent noise of the voice acquisition signal circuit, reduce the circuit noise and other device interference, improve the signal-to-noise ratio of the voice acquisition circuit in the voice recognition of the whole vehicle navigation system and meet the actual application demands.
The embodiments of the present utility model are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. A sound collection circuit in vehicle navigation system speech recognition, comprising: the voice information acquisition system comprises a voice information acquisition module (1) and a central processing module (2), wherein the voice information acquisition module (1) is connected with the central processing module (2), the voice information acquisition module (1) comprises a microphone unit (11), a low-noise operational amplifier unit (12) and a signal conversion unit (13), the microphone unit (11) is used for carrying out voice acquisition and outputting corresponding differential analog signals, the low-noise operational amplifier unit (12) is used for carrying out fixed gain amplification processing on the differential analog signals, and the signal conversion unit (13) is used for converting the differential analog signals into digital signals.
2. The sound collection circuit in voice recognition of a car navigation system according to claim 1, wherein: the low-noise operational amplifier unit (12) comprises a filter circuit (121), a low-noise operational amplifier circuit (122) and a frequency response regulating circuit (123), wherein the low-noise operational amplifier circuit (122) is respectively connected with the filter circuit (121) and the frequency response regulating circuit (123).
3. The sound collection circuit in voice recognition of a car navigation system according to claim 2, wherein: the low-noise operational amplifier circuit (122) comprises a first capacitor, a first resistor and an operational amplifier, wherein the first capacitor is connected with the first resistor in parallel, and two ends of the first capacitor are respectively connected with the reverse input end of the operational amplifier and the output end of the operational amplifier.
4. A sound collection circuit in vehicle navigation system voice recognition according to claim 3, wherein: the filter circuit (121) comprises a second capacitor and a third capacitor, two ends of the second capacitor are respectively connected with the first output end of the microphone unit (11) and the reverse input end of the operational amplifier, and two ends of the third capacitor are respectively connected with the second output end of the microphone unit (11) and the same-direction input end of the operational amplifier.
5. A sound collection circuit in vehicle navigation system voice recognition according to claim 3, wherein: the frequency response regulating circuit (123) comprises a fourth capacitor and a second resistor, wherein the fourth capacitor is connected with the second resistor in parallel, and the two ends of the fourth capacitor are respectively connected with the positive power end of the operational amplifier and the output end of the operational amplifier.
6. The sound collection circuit in voice recognition of a car navigation system according to claim 1, wherein: the signal conversion unit (13) is a digital signal processor.
7. The sound collection circuit in voice recognition of a car navigation system according to claim 1, wherein: the central processing module (2) is an SOC chip.
8. A microphone comprising a sound collection circuit in speech recognition of a car navigation system as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320090380.7U CN218998237U (en) | 2023-01-31 | 2023-01-31 | Sound acquisition circuit and microphone in vehicle navigation system voice recognition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320090380.7U CN218998237U (en) | 2023-01-31 | 2023-01-31 | Sound acquisition circuit and microphone in vehicle navigation system voice recognition |
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| Publication Number | Publication Date |
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| CN218998237U true CN218998237U (en) | 2023-05-09 |
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| CN202320090380.7U Active CN218998237U (en) | 2023-01-31 | 2023-01-31 | Sound acquisition circuit and microphone in vehicle navigation system voice recognition |
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- 2023-01-31 CN CN202320090380.7U patent/CN218998237U/en active Active
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