Head clogging detector for use in a video tape recorder

Details Head clogging detector for use in a video tape recorder Head clogging detector for use in a video tape recorder

1987-09-15

1989-05-02

LaRoche, Eugene R.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 31, 360 55, 360 7714, G11B 1514

Patent

active

048273619

ABSTRACT:
In recording/reproducing apparatus, pilot signals of different frequencies are recorded cyclically and in a predetermined sequence on parallel record tracks on a moving record medium together with an information signal organized in a series of fields and are employed to control tracking of a reproducing head of the apparatus during reproduction. During reproduction, the record medium is transported at a predetermined speed and phase relative to the reproducing head in order to generate reproduced pilot signals and a reproduced information signal. The reproduced pilot signals are multiplied by reference pilot signals switched in accordance with a head switching signal, thereby generating an output from which a tracking error signal is derived. The tracking error signal is sampled and held at predetermined points of a plurality of fields. A comparator effects a comparison of the sampled-and-held signal with a reference signal and produces a comparator output signal having a state that depends on the comparison. A head clogging detector is responsive to the comparator output signal for effecting detection of a head-gap clogged condition of the reproducing head.

REFERENCES:
patent: 3525930 (1970-08-01), Hodge
patent: 4489354 (1984-12-01), Dann
patent: 4594615 (1986-06-01), Nemoto et al.
patent: 4607297 (1986-08-01), Sonoda et al.
patent: 4618899 (1986-10-01), Doutsubo
patent: 4642704 (1987-02-01), Doutsubo
patent: 4658309 (1987-04-01), Yasuda et al.
patent: 4660103 (1987-04-01), Wilkinson et al.
patent: 4682247 (1987-07-01), Doutsbo
patent: 4736260 (1988-04-01), Wilkinson

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