Magnetic recording reproducing system

Details Magnetic recording reproducing system Magnetic recording reproducing system

1975-07-11

1977-03-08

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

Checking record characteristics or modifying recording...

360 65, 360 66, G11B 545, G11B 5008

Patent

active

040115852

ABSTRACT:
This invention provides a magnetic recording reproducing system which is able to obtain an optimum recording bias current for various magnetic tapes different in characteristic. The system is designed so that a reference frequency signal of a predetermined level is recorded on a magnetic tape while applying a continuously variable recording bias by use of a triangular waveform or a sawtooth waveform, whose voltage varies linearly, and means is provided to rectify and smooth the reproduced reference signal and to compare a peak value output thereof with an output obtained by suitably attenuating the peak value output and an output obtained through a peak value memory circuit so that the time when the levels of both signals coincide may be detected to stop an increase of the recording bias current, the value of which serving as the optimum recording bias current.

REFERENCES:
patent: 2791640 (1957-05-01), Wolfe
patent: 3310637 (1967-03-01), Skov
patent: 3368032 (1968-02-01), Gooch
patent: 3436490 (1969-04-01), Roelofs
patent: 3465321 (1969-09-01), Reisfeld
patent: 3918088 (1975-11-01), Tabuchi

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