Tape running time indication system

Details Tape running time indication system Tape running time indication system

1979-11-02

1982-07-06

Swann, III, Glen R.

Dynamic magnetic information storage or retrieval

Miscellaneous

242 7551, 242 7552, 340675, G06F 1520

Patent

active

043386458

ABSTRACT:
In a video tape recorder or audio tape recorder, the remaining tape length indicated as time or taken-up tape length indicated as time is calculated by use of microcomputer and then accurately indicated as a time length by detecting the angular velocities of a supply reel and a take-up reel. A rotational period of time of each reel is detected twice, so that the tape running speed is calculated from the two detected values and the known tape caliper thickness, thus calculating and indicating the remaining tape length indicated as time and the taken-up tape length indicated as time. The remaining tape length and taken-up tape length indicated as time in such operation modes of a tape recorder as fast forward, and rewind, as well as recording and reproduction are accurately indicated.

REFERENCES:
patent: 4172231 (1979-10-01), d'Alayer de Coglemore d'Arc
patent: 4217615 (1980-08-01), Suzuki
patent: 4232371 (1980-11-01), Kamoto

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