Circuit arrangements for modifying dynamic range

Details Circuit arrangements for modifying dynamic range Circuit arrangements for modifying dynamic range

1981-12-01

1985-02-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330126, 330149, 333 14, H03G 330, H03F 126

Patent

active

044980558

ABSTRACT:
Improvements in compressors, expanders and noise reduction systems are disclosed which reduce the susceptibility of such circuit arrangements to undue control by signals outside the pass-band(s) (i.e., stop-band signals) in which the circuits are active. Level dependent circuitry operates, particularly by means of non-linear processing, to reduce the circuit response to the effect of stop-band signal components at high input signal levels.

REFERENCES:
patent: 3795876 (1974-03-01), Takahashi et al.
patent: 4072914 (1978-02-01), Haramoto et al.
patent: 4136314 (1979-01-01), Blackmer et al.
Fred Ives, "A Noise-Reduction System: Dynamic Spectral Filtering", Journal of the Audio Engineering Society, Sep. 1972, Vol. 20, No. 7.
Ray Dolby, "An Audio Noise Reduction System", Journal of the Audio Engineering Society, Oct. 1967, Vol. 15, No. 4.
Von Gerhard Dickopp et al., "Der Telefunken-Kompander", Rundfunktechn., Mitteilungen, Jan. 22, 1978, pp. 63-74.
Joseph Hull, "Dolby C-Type Noise Reduction", Audio Magazine, May 1981.

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