Noise-immune automatic gain control for QAM radio receivers

Details Noise-immune automatic gain control for QAM radio receivers Noise-immune automatic gain control for QAM radio receivers

1997-05-15

1998-09-08

Flynn, Nathan J.

Television

Receiver circuitry

375262, 375345, 375346, 329304, H04N 552

Patent

active

058052410

ABSTRACT:
Automatic gain control (AGC) for a quadrature-amplitude-modulation (QAM) digital radio receiver, such as used for receiving digital high-definition television transmissions, is provided immunity to the effects of the ringing of intermediate-frequency (IF) amplifiers at carrier frequency in response to impulse noise. The energy associated with the ringing of the IF amplifiers is at frequencies relatively close to the carrier of the IF signal as compared to data modulation. Filtering that suppresses the energy associated with the ringing of the IF amplifiers is used to recover information concerning the envelope variations of the QAM signal free from accompanying ringing energy, which envelope variations are then peak detected to develop AGC signals for the QAM digital radio receiver.

REFERENCES:
patent: 5235424 (1993-08-01), Wagner et al.
patent: 5565932 (1996-10-01), Chitta et al.
patent: 5636252 (1997-06-01), Patel et al.

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