System for discriminating tape speed mode

Details System for discriminating tape speed mode System for discriminating tape speed mode

1990-03-09

1991-05-28

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

G11B 15467

Patent

active

050199234

ABSTRACT:
There is disclosed an improvement of a system for discriminating a tape speed mode of a recorded tape on which control pulses are recorded in the tape speed mode, so that a spacing of the control pulses represents the tape speed mode. The system comprises a reel element for winding the recorded tape and transporting the recorded tape at a varying speed; a head element for detecting the control pulses and producing detected pulses when the recorded tape is transported by the reel element rotating at a rotation rate; a counting circuit for counting the detected pulses at a rate of the rotation rate of the reel element and producing a counted value; and a determining circuit for determining the tape speed mode from the counted value by comparing the counted value with a threshold value and outputting a determined result as the tape speed mode.

REFERENCES:
patent: 4338640 (1982-07-01), Yabu et al.
patent: 4594618 (1986-06-01), Kozuki et al.
patent: 4618899 (1986-10-01), Doutsubo
patent: 4663673 (1987-05-01), Doutsubo

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