Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1981-08-28
1984-02-07
Griffin, Robert L.
Telecommunications
Transmitter and receiver at separate stations
With control signal
333 14, 381 94, 381107, H04B 164
Patent
active
044307543
ABSTRACT:
A noise reducing apparatus comprises a first variable gain control circuit for giving a level compression characteristic to an input signal by a first composite control voltage, to produce an output signal to a transmission path, a first control voltage producing circuit for dividing an output signal of the first variable gain control circuit into a plurality of frequency bands, and producing a plurality of control voltages respectively given with mutually different integration time constants for each of the divided frequency bands, a first adding circuit for respectively additionally composing the plurality of control voltages obtained from the first control voltage producing circuit, to obtain the first composite control voltage, a second variable gain control circuit for giving a level expansion characteristic complementary to the level compression characteristic to a level compressed signal obtained through the transmission path by a second composite control voltage, to produce an output signal, a second control voltage producing circuit for dividing an input signal of the second variable gain control circuit into a plurality of frequency bands, and producing a plurality of control voltages respectively given with mutually different integration time constants for each of the divided frequency bands, and a second adding circuit for respectively additionally composing the plurality of control voltages obtained from the second control voltage producing circuit, to obtain the second composite control voltage.
REFERENCES:
patent: 3305627 (1967-02-01), Krause
patent: 4187477 (1980-02-01), Endoh et al.
patent: 4363006 (1982-12-01), Ishigaki et al.
patent: 4363007 (1982-12-01), Haramoto et al.
Bernat Louis
Griffin Robert L.
Victor Company of Japan Ltd.
Watkins Albert W.
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