Wave transmission lines and networks – Amplitude compression and expansion systems
Patent
1981-09-10
1984-12-25
Gensler, Paul L.
Wave transmission lines and networks
Amplitude compression and expansion systems
381106, 455 72, H04B 164
Patent
active
044906919
ABSTRACT:
In a first aspect of the invention, compressor and expander circuits are arranged in series, the dynamic actions of the circuits being substantially separated with respect to level. The changing gain portions of the characteristics are staggered among the series circuits such that the resulting overall characteristic has a maximum compression or expansion ratio substantially no greater than that of any single circuit while providing more compression or expansion than for any of the circuits individually. A second aspect, referred to as "spectral skewing", effects a reduction of the influence of signals in the high and/or low frequency extremes of a signal transmission system on the action of a compressor feeding the transmission channel. Consequently, a complementary expander fed by the channel is less likely to be controlled by signals at frequencies subject to transmission channel errors. A third aspect provides an anti-saturation effect. This aspect of the invention takes advantage of the properties of dual path compressors and expanders, in which the output of the circuits at very low signal levels is provided mostly by the further path and at high levels, mostly by the main path. The disclosure also describes combinations of two or more aspects of the invention. In one particular combined embodiment, C-type noise reduction is provided. Additionally, arrangements for compressor/expander switching and B-type/C-type noise reduction switching are disclosed.
REFERENCES:
patent: 2173472 (1939-09-01), Doba, Jr.
patent: 2287077 (1942-06-01), Abraham
patent: 2395758 (1946-02-01), Potter
patent: 4072914 (1978-02-01), Haramoto et al.
patent: 4363007 (1982-12-01), Haramoto et al.
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