Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1994-12-27
1997-04-01
Brown, Thomas W.
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
379389, 379392, 381 71, 381 94, H04M 100, H03B 2900
Patent
active
056174721
ABSTRACT:
A telephone set comprises a noise detector, a noise level determining circuit, and a noise canceler. The noise detector detects a noise component from a transmitting acoustic signal by detecting signal recurrence of the transmitting acoustic signal. The noise level determining circuit determines a noise level by comparing the noise component with a first threshold. According to the noise level, the noise canoelet cancels the noise component from the transmitting acoustic signal when the noise level is not smaller than the first threshold. The telephone set further comprises a frequency characteristics controller for a received acoustic signal to obtain a desired speech articulation. The frequency characteristics controller, based on the noise level, determines a level change region, a level change value, and a level change direction of the spectrum of the received acoustic signal.
REFERENCES:
patent: 4628529 (1986-12-01), Borth et al.
patent: 4769847 (1988-09-01), Taguchi
patent: 5384843 (1995-01-01), Masuda et al.
patent: 5398281 (1995-03-01), Kurokawa et al.
patent: 5398282 (1995-03-01), Forrester et al.
British Search Report.
Sisido Michitaka
Yoshida Toshio
Brown Thomas W.
NEC Corporation
Saint-Surin Jacques M.
LandOfFree
Noise suppression of acoustic signal in telephone set does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noise suppression of acoustic signal in telephone set, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise suppression of acoustic signal in telephone set will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-546037