Dynamic information storage or retrieval – Control by timer or external extraneous condition
Patent
1989-07-24
1990-10-16
Levy, Stuart S.
Dynamic information storage or retrieval
Control by timer or external extraneous condition
368245, 368 10, G11B 3100
Patent
active
049641085
ABSTRACT:
A sound reproducing apparatus is provided with an audio signal processing circuit for receiving an audio signal from a signal input circuit and applying the same to a speaker or sound producer through a variable resistor which is adjusted to vary its effective resistance value by an actuator operating in response to a drive signal so as to reproduce sound corresponding to the audio signal with a volume determined by the effective resistance value of the variable resistor, a time control for causing the audio signal processing circuit to commence operation automatically at a preset time, a duration setting arrangement operative in response to a duration setting signal to store in a memory data corresponding to a selected duration of operation of the actuator, and a controller programmed to be operative, when the time control causes the commencement of operation of the audio signal processing circuit at the preset time, to cause a signal generator to apply a drive signal to the actuator for the selected duration corresponding to the data stored in the memory so as to determine the volume of sound from the speaker at the end of such duration.
REFERENCES:
patent: 4047377 (1977-09-01), Banks, Jr.
patent: 4451796 (1984-05-01), Yasumura
patent: 4481674 (1984-11-01), Silva
patent: 4879699 (1989-11-01), Sakamoto
Kurita Tohru
Ohtsu Masahiro
Levy Stuart S.
Sinderbrand Alvin
Sony Corporation
Tomassini James E.
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