System for control of speech direction in duplex telephone circu

Details System for control of speech direction in duplex telephone circu System for control of speech direction in duplex telephone circu

1975-10-20

1977-10-04

Claffy, Kathleen H.

H04M 160

Patent

active

040525627

ABSTRACT:
A system for control of speech direction in duplex telephone circuits (e.g. hands-free telephones), derives a switching control signal proportional to both the immediate transmit-channel signal value, and a Regulating Value which is the ratio of the Receive-Channel Signal to the Transmit-Channel Signal under no-local-sound-source condition. Thus the Regulating Value is proportional to the local acoustic feedaround (Overhearing) signal between local loudspeaker to microphone. The Regulating Value responds to faster variations (caused by speech) to cause direction-switching, but merely compensates for slower variations (caused by movement of people or microphone in the local room). Switching (Breakthrough) of the microphone to On and the loudspeaker to Off also depends on the magnitude of the closed-channel (non-connected) microphone signal exceeding that of the open channel.

REFERENCES:
patent: 3027429 (1962-03-01), Eklov
patent: 3794763 (1974-02-01), Boudewijns et al.
patent: 3801747 (1972-10-01), Queffeulou
patent: 3832491 (1974-08-01), Sciulli et al.
patent: 3848093 (1974-11-01), Edstrom
patent: 3927267 (1975-12-01), Voyer et al.

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