Method and apparatus for signal processing by interpolation and

Details Method and apparatus for signal processing by interpolation and Method and apparatus for signal processing by interpolation and

1991-11-15

1994-01-18

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

36472416, 358166, H04N 5202

Patent

active

052803538

ABSTRACT:
A sampled input signal, e.g. a video signal, is processed to provide output signals appropriate for positions between input samples by interpolating between the input samples using an interpolating transversal filter (110) and filtering the interpolated signal with a second filter (150) the gain of which increases with increasing frequency. The coefficients of the interpolating transversal filter are chosen so as simultaneously to compensate the frequency response of the second filter and to provide a desired position offset of the output samples with respect to the input samples. The interpolation and filtering steps may be reversed in order. Surprisingly the interpolation is improved in quality when it incorporates a de-emphasis operation in this way. The sampling may be the sampling achieved by the video signal line structure. A non-linear circuit (140) such as a gamma corrector may be interposed between the interpolator and the equalizer. The system can in particular be used to process the video output of a telecine, or to process digital audio signals.

REFERENCES:
patent: 4278995 (1981-07-01), Fearnside et al.
patent: 4583120 (1986-04-01), Murakami et al.
patent: 4730342 (1988-03-01), Saito
patent: 4862403 (1989-08-01), Iwase et al.
patent: 5067137 (1991-11-01), Kaneko
patent: 5144434 (1992-09-01), Yamashita et al.

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