Signal recognition apparatus

Details Signal recognition apparatus Signal recognition apparatus

1974-02-14

1976-03-16

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178 782, 178 787, 178 791, 178DIG12, 178DIG34, H01J 162, H01J 2989

Patent

active

039447332

ABSTRACT:
An electron - optical - photographic system utilizes the novel qualities of an optical density wedge filter for use with a CRT oscillograph having an optical density along the taper of the wedge equal to the square root of the probability density distribution of a random variable, e.g., "white noise" displayed on one side of the X-axis of the oscillograph. The visual portrayal of the amplitude-time presentation of noise (as on a cathode ray tube) is modified by the filter to produce a uniform gray pattern. Addition of a sinusoidal signal to the noise then results in a clear recognition of the signal even when it is well below the noise level.

REFERENCES:
patent: 2494992 (1950-01-01), Ferguson
patent: 3313940 (1967-04-01), Goodrich
patent: 3397023 (1968-08-01), Land
patent: 3519742 (1970-07-01), Bjelland
patent: 3592112 (1969-07-01), Frey

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