Patent ID: 6219107
Filing Date: 2001-04-17
Classification: H04N

Abstract:
A method for amplifying video signals, comprising the steps of:(a.) during normal operation, passing an analog video signal successively through at least one automatic-gain-control stage, at least one analog filter stage, and an analog-to-digital converter stage; and(b.) when calibration is required, then automatically(i.) bypassing at least one said filter stage, and feeding said analog video signal through said automatic-gain-control stage and said analog-to-digital converter stage, and adjusting said automatic-gain-control stage in accordance with the output of said converter stage; and thereafter(ii.) feeding said analog video signal through said automatic-gain-control stage, said at least one filter stage, and said analog-to-digital converter stage, and adjusting an offset value at the input of said converter stage in accordance with the output of said converter stage;whereby optimal calibration is achieved.