Automatic noise reduction for individual frequency components of

Details Automatic noise reduction for individual frequency components of Automatic noise reduction for individual frequency components of

1988-11-22

1990-02-13

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, 455296, 455303, 455308, H04N 521

Patent

active

049011502

ABSTRACT:
A method and system for separating a noise signal into frequency components, then automatically performing noise reduction on the individual frequency components, and then recombining the processed frequency components to generate an output noise signal. The noise reduction parameters for each frequency component may be independently set. The output noise signal generated during performance of the invention will typically be recombined with a signal (such as a television signal) from which the input noise signal for the invention was originally extracted. In a preferred embodiment, the input noise signal supplied to the system of the invention is generated by subtracting two adjacent frames of a television signal. In a preferred embodiment, the system of the invention includes: circuitry for implementing a Walsh-Hadamard transform to separate the input noise signal into a set of frequency components; a set of automatic gain controlled amplifiers for independently performing noise reduction on each frequency component; and a noise component collator for combining the processed frequency components to generate a "component controlled noise signal". Each automatic gain controlled amplifier is independently controlled in response to a feedback signal representing the noise characteristics of a different frequency component of the input noise signal. Preferably, the system of the invention also includes a gain controlled amplifier for transforming the component controlled noise signal into a gain controlled noise output signal.

REFERENCES:
patent: 4044381 (1977-08-01), Shimano
patent: 4167755 (1979-09-01), Nagumo
patent: 4504864 (1985-03-01), Anastassiou
patent: 4554514 (1985-11-01), Whartenby
patent: 4698680 (1987-10-01), Lewis

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