Auxiliary attenuator arrangement for use in voice-switched speak

Details Auxiliary attenuator arrangement for use in voice-switched speak Auxiliary attenuator arrangement for use in voice-switched speak

1991-11-18

1995-07-04

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379388, 379390, 379391, 379392, H04M 1100

Patent

active

054307961

ABSTRACT:
Speech signals appearing at the receiving and transmitting paths of a speakerphone which operates under voice switching, are received at a control circuit. The control circuit issues a control signal which assumes a first level in the event that a signal at the receiving path exceeds a signal at the transmitting path and which assumes a second level if the signal at the receiving path falls below the signal at the transmitting path. Communication loss is inserted in both the receiving and transmitting paths in response to the first level of the control signal, and is eliminated therefrom in response to the second level of the control signal.

REFERENCES:
patent: 4507524 (1985-03-01), Yun
patent: 4764954 (1988-08-01), Tsurusaki et al.
patent: 4982425 (1991-01-01), Yoshida
patent: 5014294 (1991-05-01), Kromenaker et al.
patent: 5212722 (1993-05-01), Murata

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