Comb filter equalization circuit

Details Comb filter equalization circuit Comb filter equalization circuit

1979-08-01

1981-04-21

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

042636124

ABSTRACT:
A comb filter apparatus is provided with means for equalizing the delayed and undelayed signal levels at the inputs to the adding or subtracting matrix, whereby maximum cancellation and reinforcement of the undesired and desired signals is effected. An input signal is coupled to an additive or subtractive matrix by way of an undelayed signal path and a delayed signal path. The delayed and undelayed signals at the inputs to the matrix are each coupled to a detector by way of a bandpass filter, which pass frequencies at which the combing of the signal is most critical. The detectors detect the levels of the input signals and apply the detected levels as two inputs to a difference circuit. The two signal levels are compared in the difference circuit to develop a gain control signal. The gain control signal is utilized to control the gain of a gain controllable stage which is coupled in series with one of the signal paths thereby equalizing the levels of the input signals to the combining matrix.

REFERENCES:
patent: 3604844 (1971-09-01), Ross
patent: 3849593 (1974-11-01), Brun
patent: 4072984 (1978-02-01), Kaiser
patent: 4074321 (1978-02-01), Miller
patent: 4096516 (1978-06-01), Pritchard
patent: 4158209 (1979-06-01), Levine

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