Telephone group listening systems

Details Telephone group listening systems Telephone group listening systems

1980-05-05

1982-05-18

Konick, Bernard

179 1FS, H04M 160, H04M 120

Patent

active

043306900

ABSTRACT:
A telephone group listening system is one in which one member of an assembled group has a telephone for communication with a remote party while the other members may only listen to the communication through the agency of a loudspeaker. The system is subject to the Larsen effect on call answering or clear down if the telephone handset is normally sited close to the loudspeaker. This effect is overcome by including a proximity switch in the loudspeaker circuit, the switch being triggered by a change in the level of coupling of a capacitively or inductively coupled circuit, the coupling being dependent on the closeness of the speaker's body to the switch or on the separation of the handset and the loudspeaker.

REFERENCES:
patent: 3109893 (1963-10-01), Burns
patent: 3928723 (1975-12-01), Kai

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