Noise cancellation apparatus

Details Noise cancellation apparatus Noise cancellation apparatus

1995-06-07

1998-03-24

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 7113, 381 717, G10K 1116

Patent

active

057321434

ABSTRACT:
This invention relates to a method and an apparatus for reducing ambient noise for use with a headset or a boom headset attached to a boom microphone device or the like. The apparatus can include a sensor microphone to detect a background noise signal, a desired input audio transmission, and signal processing means for canceling the noise signals to create an inverted anti-noise signal within an acoustical waveguide located adjacent to the earphone of headset. The method for reducing noise according to this invention is provided by an open loop circuit allowing the input audio signal from an operator or caller to be transmitted to the user's ear without the disturbance of unwanted ambient noise. The method provides adjustments to the gain/or and phase of a noise signal for canceling the noise component detected, within an acoustical waveguide to produce a quiet zone for the desired audio speech to be transmitted.

REFERENCES:
patent: 3170046 (1965-02-01), Leale
patent: 4672674 (1987-06-01), Clough
patent: 5138664 (1992-08-01), Kimura et al.

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