Noise cancellation apparatus

Details Noise cancellation apparatus Noise cancellation apparatus

G - Physics

10

K

G10K 11/16 (2006.01) H04M 1/05 (2006.01) H04M 1/19 (2006.01) H04M 1/60 (2006.01) H04R 1/10 (2006.01) H04R 3/02 (2006.01) H04B 1/12 (2006.01)

Patent

CA 2204880

Apparatus for reducing acoustic background noise for use with a telephone handset (10) or a boom microphone device (100) or a boom headset (401) or the like. The apparatus includes first (12) and second (14) microphones which are arranged such that the first microphone (12) receives a desired speech input and the background noise present in the vicinity of the speech, and the second microphone (14) receives substantially only the background noise. The background noise from the second microphone (14) is converted into a corresponding electrical signal and substracted (16) from a signal corresponding to the speech and background noise obtained from the first microphone (12) so as to produce a signal representing substantially the speech.

L'invention concerne un dispositif permettant de réduire le bruit de fond acoustique et conçu pour être utilisé avec un combiné téléphonique (10), ou un système de micro-rail (100) ou un micro-casque (401) ou similaire. Ce dispositif comprend un premier (12) et un second (14) microphone disposés de façon à ce que le premier microphone (12) reçoive un signal vocal d'entrée voulu et le bruit de fond présent à proximité du signal vocal, et de façon à ce que second microphone (14) ne reçoive pratiquement que le bruit de fond. Le bruit de fond du second microphone (14) est converti en un signal électrique correspondant, puis soustrait (16) d'un signal correspondant au signal vocal et au bruit de fond obtenu à partir du premier microphone (12), ce qui permet de produire un signal représentant pratiquement le signal vocal.

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