A Vehicle Current Source Microphone Interface Circuit Structure
An interface circuit and microphone technology, applied in the electrical field, can solve problems such as the substandard signal-to-noise ratio of the microphone circuit, high misjudgment rate in vehicle-mounted applications, and poor voice recognition efficiency, and achieve easy application, signal-to-noise ratio improvement, and noise elimination Effect
Active Publication Date: 2022-01-28
YANFENG VISTEON ELECTRONICS TECH (SHANGHAI) CO LTD
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Problems solved by technology
The vehicle current source type microphone interface circuit structure described in the prior art needs to solve the technical problems of high power supply noise, substandard signal-to-noise ratio of the microphone circuit, high misjudgment rate of vehicle applications such as Carplay / Carlife, and poor speech recognition efficiency in the prior art.
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Embodiment 1
[0017] Such as figure 1 As shown, the vehicle-mounted current source microphone interface circuit structure of the present invention includes a microphone, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first Diode D1, second diode D2, first capacitor C1, second capacitor C2 and amplifier U1, wherein the negative terminal P2 of the microphone is connected to the third resistor R3, the first diode D1 and the second diode D2 are connected in series to the ground terminal GND, the positive terminal P1 of the microphone is connected to the power supply Vcc through the second resistor R2, and the first terminal P3 of the third resistor R3 is connected through the The first capacitor C1 and the fourth resistor R4 are connected to the negative input terminal of the amplifier U1, the second terminal P4 of the third resistor R3 is connected to the positive input terminal of the amplifier U1, and The first resistor R1 is con...
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A vehicle-mounted current source microphone interface circuit structure, including a microphone, five resistors, two diodes, two capacitors and an amplifier, the negative terminal of the microphone is grounded in series with the third resistor and the two diodes, and the positive terminal of the microphone passes through The second resistor is connected to the power supply. The first terminal of the third resistor is connected to the negative input terminal of the amplifier through the first capacitor and the fourth resistor. The second terminal of the third resistor is connected to the positive input terminal of the amplifier and connected to the power supply through the first resistor. One end of the fifth resistor is connected to the fourth resistor and the negative input end of the amplifier, and the other end is connected to the output end of the amplifier. The second capacitor is connected in parallel with the fifth resistor. The output port of the interface circuit is connected with the output terminal of the amplifier, the fifth resistor and the second capacitor. The positive terminal of the power supply of the amplifier is connected to the power supply, and the negative terminal of the power supply is grounded. The invention is a circuit structure capable of converting voice signals into current signals, effectively improving the signal-to-noise ratio of a microphone circuit, and improving the accuracy of voice recognition.
Description
Technical field: [0001] The invention relates to the electrical field, in particular to a microphone interface circuit, in particular to a vehicle-mounted current source type microphone interface circuit structure. Background technique: [0002] In recent years, the car entertainment system has developed rapidly, and applications such as Carplay / Carlife have appeared. These applications include the function of speech recognition, and the requirements for the signal-to-noise ratio of the microphone circuit are getting higher and higher. In order to filter out the noise in the circuit and improve the signal-to-noise ratio of the audio output from the microphone, the interface circuit must be continuously improved to meet the ever-increasing voice quality requirements. [0003] In the prior art, the traditional microphone interface circuit structure mainly connects the positive terminal and the negative terminal of the microphone to the two input terminals of the differential a...
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IPC IPC(8): H04R3/00
CPCH04R3/00H04R2430/00
Inventor 杨益王辉
Owner YANFENG VISTEON ELECTRONICS TECH (SHANGHAI) CO LTD