Signal compressors and expanders

Details Signal compressors and expanders Signal compressors and expanders

1974-09-25

1976-06-29

Smith, Alfred E.

Wave transmission lines and networks

Amplitude compression and expansion systems

307237, 333 17L, 333 70CR, H04B 164, H03H 710, H03H 716, H03G 1104

Patent

active

039672190

ABSTRACT:
A compressor or expander circuit is constructed by connecting a plurality of impedance networks in series across input terminals, at least one network being frequency selective. Output terminals are connected across one or more of the networks. The frequency selective network varies its parameters in response to the level of components within a restricted frequency band determined by this network so as to narrow the band when the level of such components increases. This includes such components from the restricted band and thereby from the compression or expansion action.

REFERENCES:
patent: 2052110 (1936-08-01), Pfister
patent: 2182089 (1939-12-01), Lueder
patent: 2255690 (1941-09-01), Wheeler
patent: 2413263 (1946-12-01), Suter
patent: 2936426 (1960-05-01), McClean
patent: 3281723 (1966-10-01), Mercer
patent: 3314026 (1967-04-01), Maynard
"Reference Data for Radio Engineers," Howard W. Sams and Co., New York, 1968, pp. 7-4 and 7-5.

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