H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/40, 325/56
H04N 5/38 (2006.01) H03C 3/02 (2006.01) H03G 3/20 (2006.01)
Patent
CA 1203009
-1- FM AUTOMATIC GAIN CONTROL SYSTEM Abstract An improved automatic gain control (AGC) for a television transmission system comprising a transmitter for transmitting a TV signal via a transmission path to a receiver and having a certain bandwidth in which said transmitter includes a generator for generating a baseband TV signal which can be pre-emphasized and a variable gain amplifier responsive to the basehand TV signal to produce an amplified baseband video signal. The AGC system comprises a band eliminating filter responsive to the baseband output signal to produce a first control signal -whose amplitude reflects the change in energy content of that portion of the TV output signal lying outside the allowed transmission bandwidth when said baseband signal is frequency modulated to a carrier. The variable gain amplifier is responsive to the control signal to vary its gain substantially inversely as the out-of-band energy content varies. At the receiver, a detector detects a component of the received TV signal which has known characteristics, usually constant, in the absence of the gain introduced at the transmitter. The detector produces a second control signal which controls another variable gain amplifier to compensate for such gain and return the TV signal to its original form.
414885
Morneau Roland L.
Rca Corporation
LandOfFree
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