Electrical audio signal processing systems and devices – Voice controlled
Patent
1987-01-27
1989-02-28
Isen, Forester W.
Electrical audio signal processing systems and devices
Voice controlled
H03G 320
Patent
active
048093394
ABSTRACT:
A method and circuit for supplying power from a constantly available power source (20) to an audio power amplifier (14) for a speaker (12) utilizing input leads (16,18) having an audio signal. A pre-amplifier (24) is used for amplifying the audio signal having a difference in potential between the input leads (16,18). A switch (58) powers the audio power amplifier (14) and pre-amplifier (24) from the power source (20) in response to a control signal. The method and circuit is characterized by sensing (26) the existence of a diminished audio signal by determining a greater difference than the predetermined difference between the input leads (16,18) to produce the control signal which operates a relay driver transistor (62) which, in turn, operates a relay switch (66) to supply power to the pre-amplifier (24) and power amplifier (14).
REFERENCES:
patent: 3924070 (1975-12-01), Seaver
patent: 3992585 (1976-11-01), Turner
patent: 4411020 (1983-10-01), Imazeki
patent: 4441086 (1984-04-01), Karlow
patent: 4453264 (1984-06-01), Hochstein
patent: 4531237 (1985-07-01), Bar-on
Linear Data Book, (National Semiconductor), 1976, pp. 9-26, 9-27.
Radio Shack 1985 Catalog (copyright 1984), p. 21, 40-1259.
"Sound Operated Switch", by M. Tooley and David Whitfield, Practical Electronics, May 1979, vol. 15, No. 5, pp. 46-49, National Semiconductor, Linear Applications, p. AN69-2, Dec. 1972.
Hochstein Peter A.
Shih Kelvin
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