Wave transmission lines and networks – Amplitude compression and expansion systems
Patent
1982-03-04
1984-05-15
Gensler, Paul L.
Wave transmission lines and networks
Amplitude compression and expansion systems
381106, 455 72, H04B 164
Patent
active
044491069
ABSTRACT:
A noise reducing apparatus consists of a compression system and an expansion system. The compression system comprises a pre-emphasis circuit for performing a pre-emphasis operation with respect to an input signal, a first variable gain control circuit for giving a level compression characteristic to an output signal of the pre-emphasis circuit, to produce an output signal to a transmission path, a first control voltage producing circuit for dividing the output signal of the first variable gain control circuit into a plurality of bands, to produce a plurality of control voltages respectively given mutually different bands, a first weighting circuit for respectively and relatively weighting the plurality of control voltages obtained from the first control voltage producing circuit, and a first adding circuit for adding the plurality of control voltages obtained from the first weighting circuit, to obtain a first control voltage and apply this first control voltage to the first variable gain control circuit. The expansion system similar to the compression system, comprises a second variable gain control circuit for giving a level expansion characteristic to the level compressed signal obtained through the above transmission path, where the level expansion characteristic is complementary to the level compression characteristic.
REFERENCES:
patent: 4101849 (1978-07-01), Blackmer et al.
patent: 4281295 (1981-07-01), Nishimura
patent: 4353035 (1982-10-01), Schroder
patent: 4363006 (1982-12-01), Ishigaki et al.
patent: 4376916 (1983-03-01), Glaberson
Haramoto Yutaka
Ishigaki Yukinobu
Totsuka Kaoru
Gensler Paul L.
Lee Benny
Victor Company of Japan Ltd.
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