TRACKING AUTOMATIC GAIN CONTROL FOR AM FACSIMILE TERMINALS
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
An AM facsimile terminal, which may or will be operated in a receive mode, is equipped with a tracking automatic gain control (AGC) circuit to ensure that the video baseband signal is referenced to substantially the same level in the receiving terminal as in a remote transmitting terminal. Course adjustments to the reference level for the received video baseband signal are made in a course adjustment loop 11 while the terminal is being initialized for operation in a receive mode, and finer adjustments are thereafter periodically made in a fine adjustment loop 12 during the backstroke intervals, which separate successive scan lines of video data.