Telephonic handset employing feed-forward noise cancellation

Details Telephonic handset employing feed-forward noise cancellation Telephonic handset employing feed-forward noise cancellation

2006-04-18

2006-04-18

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C381S071100, C381S071130, C381S094100

Reexamination Certificate

active

07031460

ABSTRACT:
A telephonic handset comprises an active noise reduction (ANR) system. The ANR system comprises a reference microphone and an IIR filter. The IIR filter is receivingly coupled to the reference microphone with respect to noise reference signals, and it is transmittingly coupled to the receiver transducing element of the handset. The ANR system is configured as a fixed feed-forward noise cancellation system. Preferably, the IIR filter has a transfer function derived, in part, from the open-loop gain of a feedback noise cancellation system.In specific embodiments of the invention, the noise reference microphone is situated so as to sample the ambient noise field near the front face of the receiver, but without directly sampling the noise field on the front face.

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Nelson, P.A. et al. “Single Channel Feedforward Control”,Active Control of Sound, pp. 161-203, (1992).
Widrow, B. et al.Adaptive Signal Processing, prentice Hall, 1985.
U.S. Appl. No. 09/055,481, filed Apr. 6, 1998.

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