Electrical audio signal processing systems and devices – Voice controlled
Patent
1989-06-27
1990-12-04
Isen, Forester W.
Electrical audio signal processing systems and devices
Voice controlled
367198, H03G 320
Patent
active
049759647
ABSTRACT:
An automatic turn-off assembly (10) for supplying and discontinuing power to a device (12) in response to an audio signal. The audio signal is rectified (22) producing a level signal which is compared by a window comparator (26). When the level signal is within the window, a trigger signal is produced to initiate and reset a timer (30), which in turn produces a control signal for a predetermined time while being powered. If the level signal is below the window, the timer (30) is not reset. If the signal is above the window, a muting circuit (44) is initiated to mute the device (12), which is preferably an audio amplifier. The assembly (10) includes a manual push-button switch (18) for initially supplying power to the device (12) and to the timer (30). A relay (RL1) maintains the supply of power in the presence of the control signal and disconnects power from the device (12) and timer (30) after the predetermined time. The device (12) may be manually turned off to disconnect power thereto prior to the expiration of the predetermined time.
REFERENCES:
patent: 4453264 (1984-06-01), Hochstein
patent: 4506377 (1985-03-01), Kishi et al.
patent: 4809339 (1989-02-01), Shih et al.
"Voice Operated Control Switch", -Elektor, Dec. 1979, vol. 5, pp. 12-40, 12-41.
"Sound Operated Switch", Practical Electronics, May, 1979, vol. 15, No. 5, pp. 46-49.
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