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:
Jan. 11, 1977
Filed:
Jun. 03, 1975
David Peter Owen, Newbury, EN;
Quantel Limited, , EN;
Abstract
A sub carrier phase shifting circuit for use in digital television equipment comprising at least two monostable multivibrators connected in cascade. The sub carrier signal is applied to the first multivibrator. Adjusting means are connected to the control inputs of each multivibrator for adjusting the monostable period of the multivibrators. On receipt of an edge of a sub carrier wave the first multivibrator is driven from a first state to a second state whereby the first multivibrator effects a change of state at its output. The first multivibrator resets to its first state after the monostable period determined by the adjusting means to give an output delayed in relation to the edge of the sub carrier wave. The delayed output causes the second multivibrator to be driven from one state to its other whereby the second multivibrator effects a change of state at its output. The second multivibrator resets to its first state after the monostable period of the second multivibrator has elapsed, to give an output further delayed in relation to the edge of the sub carrier wave.