Microphone preamplifier
专利汇可以提供Microphone preamplifier专利检索，专利查询，专利分析的服务。并且PURPOSE:To reduce the noise of calibration signal termination resistor and to increase the sound pressure calibration accuracy, by providing the switch circuit to reduce the electric coupling, with the microphone preamplifying circuit. CONSTITUTION:The microphone preamplifying circuit 9 is provided with the amplifying circuit 1 amplifying the electric output signal of the sound reception capacitor microphone 8 and the calibration signal from the calibration input terminal 5. Further, the calibration signal termination resistor 6 terminating the calibration signal at the junction between the terminal 5 and the sound reception capacitor microphone junction terminal 4 is connected and the switch circuit 7 is connected in parallel with the resistor 6. Further, the output voltage of the microphone 8 is amplified at the amplifying circuit 1 and it is outputted to the output terminal 3, then the switch circuit 7 is controlled to shorten the resistor 6. Further, when the calibration signal is fed to the terminal 5, the switch circuit 7 is controlled into open state and the voltage across the resistor 6 is outputted to the terminal 3 via the microphone 8 and the amplifying circuit 1 to increase the accuracy of the sound pressure calibration.，下面是Microphone preamplifier专利的具体信息内容。
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