Active noise suppression system for telephone handsets and metho

Details Active noise suppression system for telephone handsets and metho Active noise suppression system for telephone handsets and metho

1994-03-04

1997-04-29

Zele, Krista M.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379390, 379419, 379433, 381 71, H04M 100

Patent

active

056256841

ABSTRACT:
System for use by a caller and a recipient of a telephone call for suppressing environmental noise in the vicinity of a telephone comprising a telephone handset forming a part of the telephone. The telephone handset has a human voice sensor for picking up human sounds generally in one direction, and creating a first electrical signal. A speaker capable of producing substantially directional human voice sounds is provided. A second sound sensor is carried by the handset and has sound pick-up capabilities from a direction which is generally opposite said one direction for picking up external environmental noise in the vicinity of the handset and producing a second electrical signal having a frequency and amplitude. Electrical circuitry is provided for processing the second electrical signal to provide a third electrical signal of the same frequency as the second electrical signal but of opposite amplitude and sign and for combining the third electrical signal with the first electrical signal to suppress environmental noise present in the first electrical signal so that the recipient will receive an electrical signal in which the environmental noise in the vicinity of the caller has been suppressed.

REFERENCES:
patent: 4672674 (1987-06-01), Clough et al.
patent: 4908855 (1990-03-01), Ohga et al.
patent: 4912767 (1990-03-01), Chang
patent: 5121426 (1992-06-01), Baumhauer, Jr. et al.
patent: 5131047 (1992-07-01), Hashimoto et al.
patent: 5148471 (1992-09-01), Metroka et al.
patent: 5201006 (1993-04-01), Weinrich
patent: 5239578 (1993-08-01), Regen et al.
patent: 5251263 (1993-10-01), Andrea et al.
patent: 5319736 (1994-06-01), Hunt
patent: 5323458 (1994-06-01), Park et al.
patent: 5335276 (1994-08-01), Thompson et al.
patent: 5343521 (1994-08-01), Jullien et al.
patent: 5381473 (1995-01-01), Andrea et al.
patent: 5406622 (1995-04-01), Silverberg et al.
patent: 5444786 (1995-08-01), Raviv
patent: 5452361 (1995-09-01), Jones
patent: 5471538 (1995-11-01), Sasaki et al.
patent: 5473702 (1995-12-01), Yoshida et al.
patent: 5481615 (1996-01-01), Eatwell et al.
patent: 5493616 (1996-02-01), Iidaka et al.
patent: 5526421 (1996-06-01), Berger et al.
Abstract: Full-duplex speakerphone with acoustic and electric echo-canceller utilizing the DSP56200 cascadable adaptive FIR filter chip, Proc. of Midcon/90 Technical Conference on Electronic and Electrical Technology, Dallas Tx, Sep. 11-13, 1990.

Affiliated with

Also associated with

Rating

Active noise suppression system for telephone handsets and metho does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active noise suppression system for telephone handsets and metho, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active noise suppression system for telephone handsets and metho will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-712452