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. 21, 1993
Filed:
Dec. 07, 1992
Michael McGinn, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An AGC system for use in positive modulation schemes of video signals is provided. The AGC system utilizes an IF amplifier, a demodulator, a video amplifier, a gated amplifier and a peak detector. The gated amplifier has a first, relatively fast, time constant associated therewith. The gated amplifier, which is activated during the time interval that the black voltage appears on the video signal, is responsive to an intial reference voltage and to the video signal for providing an output signal to control the gain of the IF amplifier. The peak detector has a second, relatively slow, time constant associated therewith. The peak detector is used to detect the peak white voltage level of the video signal to adjust the initial reference voltage to account for fluctuations and errors in the peak white voltage level.