Magnetic video reproducing apparatus having still picture reprod

Details Magnetic video reproducing apparatus having still picture reprod Magnetic video reproducing apparatus having still picture reprod

1982-06-03

1985-01-22

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Record editing

358340, H04N 5782

Patent

active

044955251

ABSTRACT:
A magnetic video reproducing apparatus employing a well-known rotational two-head system, a helical scan system and an azimuth system comprises a position detecting means for detecting the positions of the two heads and a dropout detecting means for detecting a dropout of the reproduced signal output from the two heads. A time difference detecting circuit is provided for detecting a time difference between the output from the position detecting means and the output from the dropout detecting means. A time period converting circuit is also provided for converting the time difference detected output to an output signal of a time period associated with the time difference output. A driving circuit is provided for driving a capstan shaft driving motor. The time period converting circuit is adapted such that the time period of the output therefrom may cause the capstan shaft driving motor to be driven so that the dropout timing and hence a noise zone on the screen may coincide with the change over between the two heads, whereby a noise zone due to a dropout of the reproduced signal comes to the upper or lower end of the screen.

REFERENCES:
patent: 3662101 (1972-05-01), Segerstrom
"Microprocessor Controlled Variable Play-Back Speed System for Video Tape Recorder", IEEE Transactions on Consumer Electronics, vol. CE-26, Feb., 1980, pp. 121-128.

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