Simplified communication system

Details Simplified communication system Simplified communication system

1998-03-30

2001-09-25

Isen, Forester W. (Department: 2747)

Electrical audio signal processing systems and devices

Voice controlled

C086S057000, C086S027000

Reexamination Certificate

active

06295364

ABSTRACT:

BACKGROUND AND SUMMARY
The invention relates to digital voice enhancement, DVE, communication systems, including simplex systems.
The invention arose during development efforts directed toward reducing complexities of full duplex voice communication systems, i.e. bidirectional voice transmission where talkers exchange information simultaneously. In a full duplex system, acoustic echo cancellation is needed to overcome feedback generated by closed loop communication channel instabilities. Use of a simplex scheme that alternately selects one or another microphone or channel as active is another way to effectively control feedback into a near end microphone from a near end loudspeaker. In a simplex system, voice transmission is unidirectional, i.e. either one way or the other way at any given time, but not in both directions at the same time.
A simplex digital voice enhancement communication system does not rely on acoustic echo cancellation to ensure stable communication loop gains for closely coupled microphones and loudspeakers. However, there is a potential for feedback into a near end microphone from a far end loudspeaker. This situation exists because it would be self-defeating to have the active microphone switched off. The present invention addresses and solves this problem in a particularly simple and effective manner with a combination of readily available known components.


REFERENCES:
patent: 4602337 (1986-07-01), Cox
patent: 5033082 (1991-07-01), Eriksson et al.
patent: 5111508 (1992-05-01), Gale et al.
patent: 5172416 (1992-12-01), Allie et al.
patent: 5243659 (1993-09-01), Stafford et al.
patent: 5355419 (1994-10-01), Yamamoto et al.
patent: 5396561 (1995-03-01), Popovich et al.
patent: 5544242 (1996-08-01), Robinson
patent: 5602928 (1997-02-01), Eriksson et al.
patent: 5706344 (1998-01-01), Finn
patent: 5715320 (1998-02-01), Allie et al.
patent: 5940486 (1999-08-01), Schlaff
patent: 6031918 (2000-02-01), Chahabadi
Digital Processing of Speech Signals,Lawrence R. Rabiner, Ronald W. Schafer, 1978, Bell Laboratories, Inc. Prentice-Hall, pp. 120-126.
“DFR11EQ Digital Feedback Reducer and Graphic Equalizer With Software Interface for Windows”, Model DFR11EQ User Guide, Shure Brothers Incorporated, 222 Hartrey Avenue, Evanston, IL 60202-3696, 1996.

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