Microphone noise rejection system

H - Electricity – 04 – B

Patent

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Details

H04B 15/02 (2006.01) G10K 11/175 (2006.01) H04R 3/00 (2006.01)

Patent

CA 2259641

An apparatus (200) and method removes repetitive background noise from an information signal originating from a first source, such as a microphone (202). The noise originates from a second source, such as a siren (238), and is picked up by the first source along with the information. The noise signal has a characteristic frequency and associated period. The information signal is delayed for a selected period of time based on the characteristic frequency of the repetitive noise signal and forms a phase-shifted or delayed information signal. The delayed information signal is processed with a substantially non-delayed information signal and forms a processed information signal in which the information component is substantial and the noise component is negligible.

Dispositif et procédé servant à supprimer le bruit répétitif d'arrière-plan depuis un signal d'information provenant d'une première source, telle qu'un micro. Le bruit provient d'une deuxième source, telle qu'une sirène, et est capté par la première source avec l'information. Le signal de bruit possède une fréquence caractéristique et une période associée. Le signal d'information est retardé pendant une durée sélectionnée en fonction de la fréquence caractéristique du signal répétitif de bruit et constitue un signal d'information retardé ou à phase déplacée. Ce signal d'information retardé est traité avec un signal d'information sensiblement non retardé et constitue un signal d'information traité dans lequel la composante d'information est importante et la composante de bruit négligeable.

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