Method and circuit for reducing battery power drain in a portabl

Details Method and circuit for reducing battery power drain in a portabl Method and circuit for reducing battery power drain in a portabl

1996-11-06

1998-09-15

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360 7306, 360 741, G11B 1518

Patent

active

058088237

ABSTRACT:
A technique is disclosed for reducing the power consumption of a battery powered cassette player typically including a motor. The technique includes sequentially operating the motor during a first interval (T1) and turning the motor off during a second interval (T2). In the first interval (T1) the motor is driven at a high speed rate. The first interval (T1) and the second interval (T2) are chosen so that the motor is turned off for a longer time period than it is operated to thereby conserve battery power. The technique further includes storing the information from the cassette tape player during the high speed first interval (T1). The stored information is then accessed during the intervals (T1,T2) in order to transfer the information to an output device which causes playback at a lower conventional rate. The technique is preferably implemented by utilizing a controller to perform these functions and an electronic memory device.

REFERENCES:
patent: 3492585 (1970-01-01), Ludlam
patent: 4814905 (1989-03-01), Hashimoto
patent: 4933795 (1990-06-01), Nigam
patent: 4984103 (1991-01-01), Nigam
patent: 5214543 (1993-05-01), Takao
patent: 5332928 (1994-07-01), Johnson
patent: 5381279 (1995-01-01), Dunn
patent: 5381295 (1995-01-01), Rund et al.
patent: 5525869 (1996-06-01), Wood
patent: 5530911 (1996-06-01), Lerner et al.
"Music To Go", Consumer Reports Magazine, pp. 776-783, Dec. 1995.

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