Gas flow sensor, speaker system and microphone

Details Gas flow sensor, speaker system and microphone Gas flow sensor, speaker system and microphone

H - Electricity

04

R

H04R 3/00 (2006.01) H04R 23/00 (2006.01)

Patent

CA 2421291

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.

L'invention concerne une déficience fondamentale des micros classiques et leurs mises en application en rétroaction pour des systèmes de haut-parleur. Cette limite trouve son origine dans les difficultés fondamentales de micros classiques de type membrane dans une plage de fréquence de 1-100 Hz. Le bruit propre de ces micros de type membrane augmente dans cette plage d'approximativement 1/f et ils sont sensibles à des vibrations parasites d'inertie qui sont habituellement très importantes dans cette plage de fréquence. La suppression de ces déficiences est possible au moyen de l'utilisation d'un capteur APV afin d'obtenir une rétroaction efficace des haut-parleurs, ce qui améliore considérablement les performances dans la plage de basse fréquence de 10-100 Hz. Sans cette rétroaction, les haut-parleurs classiques subissent une atténuation et/ou une déformation importantes dans cette plage de fréquence.

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