Magnetic recording apparatus

Details Magnetic recording apparatus Magnetic recording apparatus

1982-12-14

1985-04-09

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head moving during transducing

Tape record

360 91, G11B 552

Patent

active

045105383

ABSTRACT:
A miniature helical scan video tape recorder (VTR) utilizes a reduced-diameter guide drum, but the video signals recorded thereby onto the tape have a standard track pattern and can be reproduced using a standard VTR having a guide drum of standard diameter D.sub.1. In the miniature VTR, the tape is wrapped for a tape wrap angle .alpha. (e.g., substantially 300 degrees) at a still angle .theta..sub.2, whereas the standard VTR uses a wrap angle of 180.degree. and a still angle of .theta..sub.1. In order to ensure that the miniature VTR achieves the same record track length l'.sub.N and recording angle .theta..sub.0 as the standard VTR, the diameter D.sub.2 of the miniature VTR is selected to satisfy the equation ##EQU1## where f.sub.V is the video field frequency. The still angle .theta..sub.2 satisfies the equation ##EQU2## the video signal to be recorded is given a non-standard horizontal scanning frequency f'.sub.H according to the relation ##EQU3## where f.sub.H is the standard horizontal scanning frequency. The recording head can be provided with two gaps for double-azimuth recording of the video signal.

REFERENCES:
patent: 3157738 (1964-11-01), Okamura
patent: 4358799 (1982-11-01), deNiet

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