Digital low-pass filter with improved frequency reduction charac

Details Digital low-pass filter with improved frequency reduction charac Digital low-pass filter with improved frequency reduction charac

1986-11-05

1988-10-18

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 37, 358166, H04N 514, H04N 964

Patent

active

047791284

ABSTRACT:
The invention relates to a digital low-pass filter which effects a frequency reduction by a factor which is equal to the ratio w/2 between the frequency of the input signal and the frequency of the output signal, wherein w is an odd integer. The input signal is applied to m series-arranged registers. The input signal of the first and the output signals of all the registers are multiplied by coefficients. A change-over switch precedes an input of each multiplier, the change-over switch switching the coefficients symmetrically. The switching instants are always symmetrical relative to a reference sampling instant. The filter is particularly suitable for use in video signal processing, to reduce negative influences of an analog-to-digital converter.

REFERENCES:
patent: 4355326 (1982-10-01), Lee
patent: 4422094 (1983-12-01), Lewis
patent: 4597011 (1986-06-01), Baker
14 Statt 16 Bit D/A-Umsetzer fur den Audiobereich, by Dick Goedhart, et al., Analogtechnik-Elektronik 14/15.7, 1983, pp. 62-64.

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