Digital filter for executing a video emphasis process through mo

Details Digital filter for executing a video emphasis process through mo Digital filter for executing a video emphasis process through mo

1989-03-29

1990-11-27

Malzahn, David H.

Boots, shoes, and leggings

358310, H04N 979

Patent

active

049741853

ABSTRACT:
A digital filter having a characteristic expressed by a rational function executes a signal processing in a predetermined sequence in accordance with a pre-emphasis mode or de-emphasis mode. A first digital filter has a characteristic expressed by a denominator polynomial of the rational function and processes an input signal according to this characteristic to produce a first process signal. A second digital filter has a characteristic expressed by a numerator polynomial of the rational function and processes an input signal according to this characteristic to produce a second process signal. A mode selector selects one of the pre-emphasis and de-emphasis modes. A first switch supplies the input signal to the first digital filter in accordance with the pre-emphasis mode and supplies the second process signal from the second digital filter to the first digital filter in accordance with the de-emphasis mode. A second switch supplies the first process signal from the first digital filter to the second digital filter in accordance with the pre-emphasis mode and supplies the input signal to the second digital filter in accordance with the de-emphasis mode.

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Wireless World, vol. k88, No. 1580, Sep. 1982, pp. 77-79, Sheepan Place Olchester, GB Y. Hirata: "Simple Digital Filters for Sound Reproduction".
Memoirs of the Faculty of Engineering Kobe University, No. 22, Mar. 1976, pp. 127-142, Kobe, JP, K. Hirano et al., "Optimum Design of Cascade Realization Digital Filters".
Patent Abstract, Japanese Application No. 59-207720, Nov. 24, 1984.

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