Gas flow sensor, speaker system and microphone, utilizing measurement absolute of time-variations in absolute pressure
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United States of America Patent
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Issued Date -
May 27, 2004
app pub date -
Sep 15, 2003
filing date -
May 8, 2001
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Abandoned
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Abstract
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 1-100 Hz. 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 10-100 Hz. Without feedback, typical audio speakers suffer severe attenuation and/or distortion in this range.
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