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:
Dec. 01, 1987
Filed:
Feb. 05, 1985
Peter G Douglas, Chandler's Ford, GB;
Morris N Kyffin, Andover, GB;
Independent Broadcasting Authority, London, GB;
Abstract
A broadcast signal transmitter utilizes a klystron and a transmitter amplifier (10) operating in a pulsed mode. Two feedback loops are provided for controlling the output of the amplifier (10). A first feedback loop includes a control circuit (14) for providing automatic gain control of the black level of a vision signal to be transmitted while the second feedback loop includes a further control circuit (18) for improving the linearity of the transmitter. The first feedback loop output control signal at line rate while the second feedback loop output signals at first rate, both being operative during the period when an insertion test signal (I.T.S.) is supplied to the transmitter.