Method and apparatus for the variable speed reproduction of a vi

Details Method and apparatus for the variable speed reproduction of a vi Method and apparatus for the variable speed reproduction of a vi

1979-09-17

1981-10-06

Moffitt, James W.

Dynamic magnetic information storage or retrieval

Record editing

360 37, 360 38, 360 722, H04N 578

Patent

active

042938791

ABSTRACT:
This invention concerns a method of reproducing, at a selectable magnetic tape speed different from that used during the recording, a video signal stored in a plurality of separate tracks inclined to the center line of the magnetic tape by means of a head wheel carrying peripherally arranged magnetic heads, wherein the addresses of reproduced lines of picture information are derived solely from the composite signal reproduced from the magnetic tape, wherein useful lines are read into respective locations of a picture store in accordance with these line addresses, and wherein the stored lines are read out from the store in a predetermined sequence.
In the embodiment described the line addresses are derived by a counter to the counting input of which are delivered pulses which correspond to that of the horizontal synchronizing pulses taken from the magnetic tape, to the resetting input of which are delivered pulses which correspond to the vertical synchronizing pulses taken from the magnetic tape, and to a third input of which are delivered pulses the frequency of which corresponds to the frequency of cross modulation disturbances and each of which causes a change in the registered count by an amount which is determined by the registered count itself and whether the tape reproduction speed is greater or less than the recording speed.

REFERENCES:
patent: 3683992 (1972-08-01), Farr
patent: 4139867 (1979-02-01), Foerster
patent: 4175267 (1979-11-01), Fachi
patent: 4189758 (1980-02-01), Morio
patent: 4210938 (1980-07-01), Heitmann et al.

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