Dynamic magnetic information storage or retrieval – Record editing
Patent
1985-03-18
1987-07-21
Faber, Alan
Dynamic magnetic information storage or retrieval
Record editing
360 73, 360 103, H04N 5783, G11B 1546
Patent
active
046822470
ABSTRACT:
A tape speed determining apparatus applied to a video signal reproducing apparatus employing a helical scanning system, a rotating head system and a pilot signal system serves to determine automatically the recording mode of a video tape to be reproduced, in case where two kinds of recording modes, i.e. a standard recording mode and a long recording mode, are applicable and the speed of a video tape differs dependently on the respective recording modes. The tape speed determining apparatus delays by an infinitesimal time "t" the timing for selection of the reference signals f.sub.1 and f.sub.3 out of the reference signal f.sub.1 to f.sub.4 supplied at the time of reproduction, as compared with the reproducing head selection timing. An error signal generated during this delayed time "t" is sampled and held for a frame period. A wavelength of a fundamental wave of the sampling output is determined by counting the number of capstan rotation detecting pulses, and thus the recording mode of the video tape is determined as a function of the count value.
REFERENCES:
patent: 4297733 (1981-10-01), Sanderson
patent: 4403260 (1983-09-01), Kawamura
patent: 4550345 (1985-10-01), Terada
patent: 4568986 (1986-02-01), Furuhata
patent: 4607298 (1986-08-01), Yomashira
Nobuyoshi Yokobori et al., National Technical Report vol. 28, No. 3, Jun. 1, 1982 (Japan) Translation.
Faber Alan
Sanyo Electric Co,. Ltd.
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