Low-noise directional microphone system

Details Low-noise directional microphone system Low-noise directional microphone system

2003-03-06

2008-08-05

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Hearing aids, electrical

Directional

C381S092000, C381S097000

Reexamination Certificate

active

07409068

ABSTRACT:
A low-noise directional microphone system includes a front microphone, a rear microphone, a low-noise phase-shifting circuit and a summation circuit. The front microphone generates a front microphone signal, and the rear microphone generates a rear microphone signal. The low-noise phase-shifting circuit implements a frequency-dependent phase difference between the front microphone signal and the rear microphone signal to create a controlled loss in directional gain and to maintain a maximum level of noise amplification over a pre-determined frequency band. The summation circuit combines the front and rear microphone signals to generate a directional microphone signal.

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