A low-noise directional microphone system includes a front microphone, a rearmicrophone, a low-noise phase-shifting circuit and a summation circuit. Thefront microphonegenerates a front microphone signal, and the rear microphone generates a rearmicrophonesignal. The low-noise phase-shifting circuit implements a frequency-dependentphase differencebetween the front microphone signal and the rear microphone signal to create acontrolled loss indirectional gain and to maintain a maximum level of noise amplification over apre-determinedfrequency band. The summation circuit combines the front and rear microphonesignals togenerate a directional microphone signal.
展开▼
