Dynamic magnetic information storage or retrieval – Manual input recording
Patent
1985-02-01
1987-05-05
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Manual input recording
360 331, 360 102, 360 73, G11B 15087, G11B 1544
Patent
active
046636730
ABSTRACT:
An apparatus for reproducing a video signal is adapted to provide a reference signal f.sub.1 corresponding to the frequency of a first pilot signal f.sub.1, in the field period at the time of standard reproducing or in the frame period at the time of long playing reproducing, at the timing of scanning the center portion of a reproducing track by reproducing heads to be mixed with the reproduced pilot signal, and to determine the beat level of the fundamental wave of the error signal while sample-holding the obtained error signal, thereby to discriminate the recording mode by determining the period of this fundamental wave as a function of the rotation detecting output of the capstan. For this purpose, the sampling pulse is provided by means of a first variable frequency dividing circuit and a reference signal generating circuit, so that at the time of standard reproducing, the reference signal f.sub.1 corresponding to the frequency of the first pilot signal f.sub.1 may be fed in the field period and the beat signal may be sampled in the field period, and at the time of long playing reproducing, the signal may be fed and the sampling pulse may be provided in the frame period.
REFERENCES:
patent: 4297733 (1981-10-01), Sanderson
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patent: 4393420 (1983-07-01), Tomizawa
patent: 4497000 (1985-01-01), Terada et al.
patent: 4550345 (1985-10-01), Terada et al.
patent: 4568986 (1986-02-01), Furuhata et al.
patent: 4594618 (1986-06-01), Kozuki et al.
"A Recording Tape Speed Discrimination System for 8mm Video", Azuma et al, 1984, National Meeting of Japan Television Society.
Cardillo Raymond F.
Sanyo Electric Co,. Ltd.
Weinhardt Robert A.
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