Patent ID: 9077342
Filing Date: 2015-07-07
Classification: H03K,H04M,H04R

Abstract:
1. A circuit assembly for processing an electrical signal of a microphone, the microphone having an inherent impedance and comprising a first electrical output and a second electrical output, wherein a voltage between the first electrical output and the second electrical output corresponds to an acoustic input signal received by the microphone, the circuit assembly comprising: an impedance circuit, a signal processing unit comprising a first input and a second input, a first electrical signal path coupleable to the first electrical output of the microphone, a second electrical signal path coupleable to the second electrical output of the microphone, a first switch coupled to the first electrical signal path, the second electrical signal path, and the first input of the signal processing unit, and configured to selectively couple the first electrical signal path or the second electrical signal path to the first input of the signal processing unit, a second switch coupled to the first electrical signal path, the second electrical signal path, and ground, and configured to selectively couple the first electrical signal path or the second electrical signal path to ground via a further impedance circuit, and a third switch coupled to the first electrical signal path, the second electrical signal path, and the second input of the signal processing unit, and configured to selectively couple the first electrical signal path or the second electrical signal path to the second input of the signal processing unit via the impedance circuit, wherein an impedance value of the impedance circuit is selected based on an impedance value of the inherent impedance of the microphone.