Tape speed control for producing a master tape carrying a digita

Details Tape speed control for producing a master tape carrying a digita Tape speed control for producing a master tape carrying a digita

1983-08-12

1985-07-02

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

G11B 1552

Patent

active

045272077

ABSTRACT:
A digital signal having a configuration of blocks or frames is recorded via a multi-track record on a first group of tracks, such as odd tracks, of a master tape which is driven at a first direction. Then when recording another digital signal by forming a second group of tracks, such as even tracks, in a second direction which is opposite to the first direction, the digital signal prerecorded on the first group of tracks is derived to produce a speed signal indicative of the tape speed at which the digital signal was recorded on the first group. The speed signal is then compared with a reference signal having a predetermined frequency for producing a control signal, which is used to control the driving speed of the master tape. Thus the second group of tracks is formed with the running speed of the master tape being controlled. As a result, the phase difference between the first and second groups of tracks is constant throughout the entire length of the master tape. The speed signal may be derived from a synchronous signal recorded on a control track, which may be formed when forming the first group of tracks.

REFERENCES:
patent: 3978521 (1976-08-01), Langer et al.

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