1974-10-03
1976-04-20
Claffy, Kathleen H.
1791706, 1791708, H04M 908
Patent
active
039521664
ABSTRACT:
In the loudspeaking telephone circuit, the speech signal is used as a control signal for detecting the extent of decreasing the acoustic coupling between the loudspeaker and the microphone of the telephone set and of the coupling between the transmitting and receiving circuits of an anti-sidetone circuit from an expected worst condition for which the telephone circuit has been designed thereby automatically decreasing the value of the variable loss utilized for preventing howling by an amount corresponding to said decrease. This circuit provides satisfactory speech communication with a smaller loss inserted than a prior art voice switch thus greatly improving unnatural sound as caused by the voice switch.
REFERENCES:
patent: 3660603 (1972-05-01), Andersen
patent: 3745262 (1973-07-01), Brolin et al.
patent: 3751602 (1973-08-01), Breeden
patent: 3860756 (1975-01-01), Shinoi et al.
patent: 3889059 (1975-06-01), Thompson et al.
patent: 3902023 (1975-08-01), Lindgren
W. Clark and J. Gale, "A New Look at Loudspeaking Telephones," Telesis Magazine, Bell-Northern Research, 1973, pp. 79-84.
Kato Kunihiro
Matsuda Ryoichi
Okayasu Ryoichi
Claffy Kathleen H.
Myers Randall P.
Nippon Telegraph and Telephone Public Corporation
Pfund Charles E.
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