Telephone with hands-free operation

Details Telephone with hands-free operation Telephone with hands-free operation

1992-04-22

1995-03-14

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, 379402, 379410, 379406, H04M 908

Patent

active

053982819

ABSTRACT:
A hands-free circuit includes a transmit noise level detector which detects a transmit noise level and a first comparator which compares the transmit noise level with a reference level. If the transmit noise level is higher than the reference level, the first comparator provides a control signal indicating a noisy state has been detected. In response to the control signal, a transmit audio level is attenuated. Further the attenuated transmit audio level is compared with a receive audio level by a second comparator which provides an output signal indicating either a transmit-mode or a receive-mode. In response to the output of the second comparator, one audio signal is attenuated.

REFERENCES:
patent: 4241236 (1980-12-01), Nash
patent: 4629829 (1986-12-01), Puhl et al.
patent: 4715063 (1987-12-01), Haddad et al.
patent: 4731832 (1988-03-01), Brossaud
patent: 4819263 (1989-04-01), Franklin
patent: 4843621 (1989-06-01), Portratz
patent: 4982425 (1991-01-01), Yoshida
patent: 5212722 (1993-05-01), Murata

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