Dual audio program system

Details Dual audio program system Dual audio program system

1995-03-02

1997-11-25

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381123, 455133, 4551851, 4551861, H03G 300

Patent

active

056920580

ABSTRACT:
Dual program audio apparatus is provided having two or more sources of input audio program signals, switching circuitry for selecting two of the input audio signals for amplification, one or more amplifiers for amplifying the selected input audio program signals, and one or more audio speakers for enabling a listener to hear both audio programs simultaneously. Volume control circuitry is provided for selecting a higher volume level for a foreground program and a relatively lower volume for a background program and circuitry is provided for selectively interchanging the foreground and background programs either instantaneously or gradually and continuously.

REFERENCES:
patent: 3806820 (1974-04-01), Uchiyama
patent: 3876953 (1975-04-01), Abel
patent: 4190803 (1980-02-01), Imamura
patent: 4660192 (1987-04-01), Pomatto, Sr.
patent: 4947440 (1990-08-01), Bateman et al.
patent: 5027689 (1991-07-01), Fujimori
patent: 5161198 (1992-11-01), Noble
patent: 5386478 (1995-01-01), Plunkett

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