Analog signal channel equalization with signal-in-noise embodime

Details Analog signal channel equalization with signal-in-noise embodime Analog signal channel equalization with signal-in-noise embodime

1974-12-05

1976-12-28

Claffy, Kathleen H.

325475, H04B 112

Patent

active

040003698

ABSTRACT:
Apparatus for reducing (a) background noise in a signal channel, and (b) channel gain variations, useful with spectral analysis equipment. Two feed forward circuits are disclosed: one to enhance a signal in noise (deriving an estimated signal); the other for AGC (relative to a preselected level). Background noise is estimated as a bias level corresponding to a minimum signal level detected within a preselected interval, the duration of such interval corresponding to a spectral interval of interest. Such noise estimate is then subtracted from the noisy signal of interest to provide a compensatorily biased signal or estimated signal. The compensatorily biased or estimated signal is then subjected to compensatory gain control by employing the ratio of a reference level to a peak detected level occurring within the preselected time interval as a gain control signal.

REFERENCES:
patent: 2135556 (1938-11-01), Beantand
patent: 3403224 (1968-09-01), Schroer
patent: 3456198 (1969-07-01), Black
patent: 3555192 (1971-01-01), Hymer
patent: 3700812 (1972-10-01), Springett
patent: 3803357 (1974-04-01), Sacks
patent: 3803496 (1974-04-01), Groen
patent: 3814856 (1974-06-01), Dugan
patent: 3831093 (1974-08-01), Walker
patent: 3848092 (1975-11-01), Shamma
patent: 3885111 (1975-05-01), Ishigami

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