GAS FLOW SENSOR, SPEAKER SYSTEM AND MICROPHONE

摘要

This invention addresses a fundamental weakness in currently common microphones, and their applications in feedback for audio speaker systems. This limitation stems from the fundamental difficulties of typical membrane- type microphones in the frequency range 1-100Hz. The self-noise of membrane- type microphones increases in this range approximately as 1/f, and membrane- type microphones are sensitive to parasitic inertial vibrations, which are usually very important in this frequency range. The removal of these limitations enables the use of such a sensor (APV sensor) for effective feedback in audio speakers, dramatically improving performance in the low- frequency range of 10-100Hz. Without feedback, typical audio speakers suffer severe attenuation and/or distortion in this range.