Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1979-07-19
1985-06-25
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
360 65, 360 73, G11B 1512, G11B 545, G11B 1546
Patent
active
045257558
ABSTRACT:
A record and playback apparatus for use with magnetic tape cassettes and the like can be switched between the normal two track cassette format for either record or playback or single track format for either record or playback. The apparatus provides optimum record and bias signals to the record head gaps being used regardless of whether two record head gaps are used for standard format or a single record head gap is used for single track format. The apparatus also preferably includes motor speed switching and regulating circuitry so that the apparatus can be satisfactorily operated at normal cassette speed or at a reduced speed, preferably one quarter that of normal speed. Switching of play and record equalization as well as record bias is also preferably included with the speed switching.
REFERENCES:
patent: 3315041 (1967-04-01), Sampson
patent: 3465321 (1969-09-01), Reisfeld
patent: 3685171 (1972-08-01), Kosaka
patent: 3855619 (1974-12-01), Karl et al.
patent: 3877070 (1975-04-01), Takenouchi et al.
patent: 4086635 (1978-04-01), Saitou
patent: 4124873 (1978-11-01), Satoh et al.
patent: 4215377 (1980-07-01), Norris
"Electronic Circuits Manual", by John Markus, McGraw Hill Book Co., 1971, pp. 381, 385 & 387.
Advertisement of "Electric Book of America", 1976.
Canney Vincent P.
Norwood Industries, Inc.
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