The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1981
Filed:
Aug. 06, 1979
Yasunori Kobori, Katsuta, JP;
Toshi Itoh, Katsuta, JP;
Yoichi Tokunaga, Mito, JP;
Tunehiko Teshima, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A servo circuit is disclosed for a video tape recorder of helical scan type having two rotary heads, in which recording/reproduction is capable of being performed at different tape feed rates, and a recording track for the video signal is formed partially superimposed on the previously-formed recording track, thus forming a recording track narrower than the heads when the tape feed rate is low. A control pulse which is in phase with the vertical synchronizing signal extracted from the video signal to be recorded is recorded in the control track, and the rotational phase of the rotary heads is controlled by use of the control pulse read at the time of reproduction. The servo circuit causes a shift in the phase of the control pulses and a change in the phase of the control pulses before recording when the tape feed rate is low.