Cyberoptic audio level control system

Details Cyberoptic audio level control system Cyberoptic audio level control system

1988-12-29

1990-02-27

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381106, 330 59, 250214AG, H03G 300

Patent

active

049052918

ABSTRACT:
The specification discloses an audio signal level control system including a center-tapped photocell incorporated into an attenuator bridge. The cell elements are monitored while processing the audio signal, and a control circuit regulates the light-emitting device in the cell in response to the monitored bridge values. Preferably, log compression and filtering are performed within the control means. Also preferably, a tracking subtraction principle is used in both the audio and control paths to expand the control dynamic range.

REFERENCES:
patent: 3258707 (1966-06-01), Lawrence, Jr.
patent: 3349319 (1967-10-01), Aiken
patent: 3521645 (1970-09-01), De Jong
patent: 4137428 (1979-01-01), Federico et al.
patent: 4410764 (1983-10-01), Werth et al.
patent: 4434325 (1984-02-01), Kobayashi et al.
patent: 4466119 (1984-08-01), Peters et al.
patent: 4577097 (1986-03-01), Keyes, IV et al.
patent: 4700060 (1987-10-01), Laiacona et al.

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