Patent ID: 6118878
Filing Date: 2000-09-12
Classification: A61F,G10K

Abstract:
An active noise canceling headset system comprising an earpiece adapted to be held against a user's ear, the earpiece comprising:a sound generator disposed with said earpiece, for generating an anti-noise field in response to drive signals applied thereto;a first sensor disposed within the anti-noise field, for generating a residual signal indicative of the sum of ambient sounds and anti-noise impinging on the sensor;a processor for generating the drive signals to the sound generator in accordance with said residual signal;means for approximating the ambient sound perceived at the user's ear;means for enhancing the low frequency response of the earpiece;means for providing a selected desired signal to the user's ear through the sound generator cancellation;means for selectively varying the transfer function of the system in response to predetermined conditions indicative of potential instability; andmeans for generating indicia of conditions indicative of reduced power needs of the system and responsively decreasing power consumption of predetermined portions of the system.