Method of measuring the remaining time of tape in a tape recorde

Details Method of measuring the remaining time of tape in a tape recorde Method of measuring the remaining time of tape in a tape recorde

1990-05-02

1994-12-20

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Miscellaneous

360 721, G11B 1700

Patent

active

053750250

ABSTRACT:
A method for correctly measuring the time remaining for a tape running in a tape recorder on the basis of a previously calculated remaining time even when the speed of the tape running in the tape recorder changes or runs at a high speed. The method determines whether or not a present remaining time has been calculated and based on this determination other steps are performed. Other steps include determining the rotation period of a supply reel, determining whether or not the tape is running at a normal speed or whether or not the tape is running in a forward direction, whether the speed of the tape is a high speed or not, subtracting from or adding to the rotation period, a change in rotation period based on the speed and direction of the tape for every rotation of the reel to calculate a new rotation period and calculating a new remaining time by subtracting the new rotation period from or adding the new rotation period to the present remaining time determined in the first mentioned step.

REFERENCES:
patent: 4805053 (1989-02-01), Yamanaka et al.
patent: 4812940 (1989-03-01), Takenaga
patent: 4866547 (1989-09-01), Rodal et al.
patent: 4963999 (1990-10-01), Utsunomiya et al.
patent: 4989112 (1991-01-01), Hamoda
patent: 4996611 (1991-02-01), Ito

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