1975-10-17
1977-02-15
Claffy, Kathleen H.
H04M 308
Patent
active
040083764
ABSTRACT:
A loudspeaking teleconferencing circuit serving a plurality of remote conference room locations includes a plurality of speakerphone sets at each conference room location and a communication network connected to an incoming and an outgoing terminal at each location. The transmit channel of each set couples a microphone to the outgoing terminal; the receive channel of each set couples the incoming terminal to a loudspeaking device; and a control circuit selectively activates one of the set transmit and receive channels at a time responsive to speech energy present on the transmit and receive channels. Each set control circuit is operative independently of the control circuits of the other sets; and the outputs of all active transmit channels are combined and applied through the location outgoing terminal to the communication network. The communication path is adapted to transmit the conference room combined output from the conference room location outgoing terminal to only the other remote location incoming terminals.
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Flanagan James Loton
MacLean, Jr. Donald John
West James Edward
Bell Telephone Laboratories Incorporated
Claffy Kathleen H.
Cubert J. S.
Kemeny E. S.
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