Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-12-21
1979-07-31
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358141, 325 65, 364515, H04N 521, H04N 704, H04B 110, G01T 116
Patent
active
041632583
ABSTRACT:
A method of and apparatus for reducing the noise of an input signal, such as a composite video signal. An orthogonal transform of the input signal is derived, this orthogonal transform having n transformed signal components. At least some of these signal components are suppressed if their respective signal levels are less than a threshold level. Preferably, the n transformed signal components correspond to different portions of the input signal; and those components representing the higher frequency portions are suppressed if their signal levels are less than the threshold level. Following this signal suppression, the n transformed signal components are reconverted into substantially the input signal, less the suppressed components.
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Applications of Walsh Functions and Sequency Theory: Mitre Corporation .COPYRGT.1974:IEEE Cat. No. 74CH0861-5EMC.
Ebihara Norio
Tatsuzawa Kaichi
Eslinger Lewis H.
Griffin Robert L.
Psitos Aristotelis M.
Sinderbrand Alvin
Sony Corporation
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