Signal background noise detector

Details Signal background noise detector Signal background noise detector

1986-02-07

1987-08-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, 364517, 364574, 364575, 455 63, 455222, 455296, H04N 5217, H04N 521, G06G 712

Patent

active

046849890

ABSTRACT:
Apparatus for estimating noise in an electrical signal having substantially redundant recurring intervals includes circuitry for producing difference samples corresponding to signal differences between the recurring redundant intervals. A number of difference samples are averaged, and ones of the difference samples contributing to each average are subtracted from the averages. Magnitude values are extracted from the differences between the averages and the difference samples. A predetermined number of the magnitude values are averaged to produce a noise estimate signal.

REFERENCES:
patent: 4249210 (1981-02-01), Storey et al.
patent: 4607278 (1986-08-01), Flamm

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