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A technology of audio circuit and bias circuit, which is applied in the direction of transducer circuit, electrical components, sensors, etc., can solve the problems of increasing system cost and achieve the effect of reducing pins and cost
Active Publication Date: 2016-01-06
WUXI ZGMICRO ELECTRONICS CO LTD
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In addition, additional peripheral components also increase the system cost
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[0017] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] The term "one embodiment" or "embodiment" here refers to that specific features, structures or characteristics related to the embodiment can be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification do not necessarily all refer to the same embodiment, nor do they necessarily refer to a separate or selected embodiment that is mutually exclusive of other embodiments. "Multiple" and "several" in the present invention mean two or more. "And / or" in the present invention means "and" or "or".
[0019] figure 2 It is a schematic circuit diagram of the first implementation of the audio circuit 200 in the present invention. Such as figure ...
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Abstract
The invention provides an improved audio circuit. The improved audio circuit comprises a microphone bias circuit, a microphone circuit, a sensing resistor, a programmable gain amplifier, an analog to digital converter, a filtering module and a digital signal processor, wherein the microphone bias circuit is used for providing a bias voltage; the microphone circuit is used for receiving an audio signal, generating a current signal reflecting the audio signal, and outputting the current signal reflecting the audio signal through an output end of the microphone circuit; the sensing resistor is connected between the bias voltage and the output end of the microphone circuit; a first input end of the programmable gain amplifier is connected with one end of the sensing resistor; a second input end of the programmable gain amplifier is connected with the other end of the sensing resistor; an input end of the analog to digital converter is connected with an output end of the programmable gain amplifier; an input end of the filtering module is connected with the output end of the programmable gain amplifier; and an input end of the digital signal processor is connected with an input end of a filter. The audio circuit can be subjected to high-pass filtering in a digital part without arrangement of any external stopping condenser, so that pins of chips can be reduced, and the cost is lowered.
Description
【Technical field】 [0001] The invention relates to an audio circuit, in particular to an improved audio circuit. 【Background technique】 [0002] figure 1 It is a schematic circuit diagram of an existing audio circuit. The audio circuit includes a microphone bias circuit (MicrophoneBias), a sensing resistor R1, a microphone circuit (Microphone), capacitors C1, C2, a programmable gain amplifier PGA, an analog-to-digital converter ADC, a low-pass filter, a digital signal processor ( DSP). In the prior art, the general microphone bias circuit, programmable gain amplifier, analog-to-digital converter, low-pass filter, and digital signal processor are all integrated in one chip, while the microphone, sensing resistor R1, capacitors C1, and C2 are chip Peripheral devices, making electrical connections on a printed circuit board. The chip in the existing scheme needs at least three chip pins: VMB, MICP, MICN, the more chip pins, the larger the chip package, which is not conducive...
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Application Information
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