H - Electricity – 04 – B
Patent
H - Electricity
04
B
379/44, 379/80,
H04B 3/20 (2006.01) H04M 1/60 (2006.01) H04M 9/10 (2006.01)
Patent
CA 1048186
ABSTRACT OF THE DISCLOSURE An intercommunication system comprises a transmit channel and a receive channel. The transmit channel includes a microphone operative in a transmit mode and a first variolosser circuit and the receive channel includes a loudspeaker operative in a receive mode, a manually gain-adjustable circuit and an automatic gain control amplifier. The first and second vario- losser circuits each provide a variable amount of loss and permit the high frequency region of the voice-frequency band to pass therethrough and have a mode wherein the amount of loss is relatively large. A first signal is derived from the transmit channel and a second control signal is derived from the receive channel in the transmit mode from a part in the system adjacent a hybrid transformer connecting the transmit and receive channels and in the receive mode from a part in the system adjacent the loudspeaker. The first control signal is subtracted from the second control signal and the resulting difference signal is applied to a pair of comparators having different threshold values. The first comparator has a threshold value corresponding to the second control signal derived adjacent the loudspeaker and the second comparator has a threshold value corresponding to the second control signal derived adjacent said hybrid transformer. A flip-flop having first and second inputs is coupled to the outputs of the first and second comparator, respectively, and first and second outputs coupled to the first and second vario- lossers, respectively. The flip-flop selects the variable amount of less in the first and second variolossers in accordance with the outputs of the comparators.
244584
Mafune Yasuo
Takahashi Juhei
LandOfFree
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