Method and apparatus to suspend speech

Details Method and apparatus to suspend speech Method and apparatus to suspend speech

1990-03-05

1991-10-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Voice controlled

381 94, 381 57, 455297, H03G 320

Patent

active

050540785

ABSTRACT:
A communication device (10) comprises an input for receiving a first audio signal (12) and an input (36) for receiving a second audio signal. The communication device (10) also includes a circular buffer (34) for storing the output digital audio signal (12) and for producing an output audio signal (20). The communication device (10) determines whether at least a portion of the output audio signal (20) is present in the second audio signal. If such a portion is present, the communication device (10) subtracts the portion of the output audio signal (20) from the second audio signal, to produce a third audio signal (26). A threshold detector, responsive to the third audio signal, produces a first control signal, when the level of the third audio signal increases to at least a first predetermined level, and a second control signal, when the level of the third audio signal decreases to a value lower than a second predetermined level, where the second predetermined level is lower than the first predetermined level. Finally, a buffer control (22 ) causes the buffer (34) to suspend production of the output audio signal in response to the first control signal, and causes the buffer (34) to resume production of the audio signal (12), in response to the second control signal.

REFERENCES:
patent: 4468813 (1998-08-01), Burke et al.
patent: 4677389 (1987-06-01), Op De Beek et al.
patent: 4811382 (1989-03-01), Sleevi
patent: 4827458 (1989-05-01), D'Alayer De Costemore D'Arc

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