Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent
1986-04-08
1988-04-05
Isen, Forester W.
Electrical audio signal processing systems and devices
Including amplitude or volume control
With amplitude compression/expansion
333 14, H03G 700
Patent
active
047364335
ABSTRACT:
Circuits for modifying the dynamic range of signals, particularly compressors and expanders for use in noise reduction compander systems, in which the plurality of characteristics are superposed such that as dominant signal components appear, hidden characteristics are revealed and become active. The emergence of characteristics can also be described as "action substitution" in the sense that the action resulting from one, or perhaps more than one characteristic is substituted for one or more other characteristic actions that have the potential to operate in the same frequency and level regions when the level and spectral content of the input signal components change. One particularly useful combination of superposed characteristics is a fixed band characteristic (variable attenuation throughout all or part of the frequency band) and a sliding band characteristic (variable attenuation through part of the frequency band achieved by a variable pass filter). The advantages of such characteristics are obtained, without the disadvantages normally inherent in each characteristic. Fixed band and sliding band circuit elements are operated in various equivalent circuit topologies: in the preferred and simplest arrangement the circuit elements are in a "stack", the output of one element acting as a reference for the other. The elements operate in generally the same level range and at least a partial overlapping in frequency range.
REFERENCES:
patent: Re30468 (1980-12-01), Dolby et al.
patent: 3795876 (1974-03-01), Takahashi et al.
patent: 4363007 (1982-12-01), Haramoto et al.
patent: 4412100 (1983-10-01), Orban
patent: 4490691 (1984-12-01), Dolby
patent: 4498060 (1985-02-01), Dolby
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