Loudspeaking telephone system

Details Loudspeaking telephone system Loudspeaking telephone system

1981-12-07

1985-04-23

George, Keith E.

179100L, H04M 160

Patent

active

045131775

ABSTRACT:
A loudspeaking telephone system has a voice switch circuit in which voice signals on transmission and reception speech channels are respectively detected to produce control signals, and these control signals are compared to judge the levels of the voice signals on both the speech channels so that the switching between both the channels is effected under the control of loss of variable attenuators inserted in both the speech channels. The control signals corresponding to the voice signals on both the transmission and reception speech channels are converted through analog-to-digital conversion into digital values which are suitable for arithmetic operation. The arithmetic operation is such that the losses of the variable attenuators are automatically controlled in accordance with the use conditions of the loudspeaking telephone system to minimum values which can prevent the howling, transmitting blocking and receiving blocking.

REFERENCES:
patent: 3952166 (1976-04-01), Kato et al.
patent: 3953676 (1976-04-01), Brown
patent: 4002854 (1977-01-01), Penrose
patent: 4051325 (1977-09-01), Mafune et al.
patent: 4052562 (1977-10-01), Andersen
patent: 4053870 (1977-10-01), Noe179 81 B

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