Variable preemphasis/deemphasis network

Details Variable preemphasis/deemphasis network Variable preemphasis/deemphasis network

1986-10-21

1988-07-26

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

047606029

ABSTRACT:
A variable preemphasis/deemphasis network is disclosed which is coupled between audio input and output terminals. The network exhibits a family of transfer function response characteristics which vary between a full deemphasis characteristic H(f) and a full emphasis characteristic 1/H(f) in response to a control signal and exhibits complementary transfer function response characteristics in response to reciprocal valued control signals. The network includes a signal filter which determines the shape of the transfer function response characteristic, and a gain controlled amplifier which determines which one of the family of transfer function response characteristics is exhibited in response to the control signal.

REFERENCES:
patent: 4218662 (1980-08-01), Schroder
patent: 4243944 (1981-01-01), Schroder
patent: 4306202 (1981-12-01), Schroder
patent: 4398157 (1983-08-01), Dieterich
patent: 4432097 (1984-02-01), Okada et al.
patent: 4629995 (1984-12-01), Katakura
patent: 4661851 (1987-04-01), Muterspaugh
"A Companding System for Multichannel TV Sound"; L. B. Tyler et al.; IEEE Trans on Consumer Elec.; vol. CE-30 #4, Nov. 1984.

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