Digital anti-aliasing filter

Details Digital anti-aliasing filter Digital anti-aliasing filter

1988-06-20

1990-11-13

Smith, Jerry

Boots, shoes, and leggings

36472401, 36441325, G06F 700

Patent

active

049706373

ABSTRACT:
An original analog signal is supplied to A/D converter 2 through analog LPF 1. LPF 1 has a cutoff frequency of fa/2 (fa is the frequency of a clock pulse supplied to A/D converter 2). LPF 1 limits a frequency band determined by filter characteristics. An output from A/D converter 2 is supplied to sample circuit 4 through maximum filter 3. An output from sample circuit 4 is supplied to a circuit of the next stage as final output Dout. Maximum filter 3 can arbitrarily set the number of sampling interval data (filter width). Maximum filter 3 is a nonlinear filter for outputting a maximum value of input data within a set filter width as a representative value of the width. The clock pulse of frequency fa is also supplied to maximum filter 3 so that input/output operation of data is synchronized with the clock pulse. The filter width of maximum filter 3 is determined in accordance with fa/fb (fb is the frequency of a clock pulse supplied to sample circuit 4 , and fa.gtoreq.fb).

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patent: 4703447 (1987-10-01), Lake, Jr.
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patent: 4789995 (1988-12-01), Hurst et al.
Gourlay et al., "Circuit for Finding the Minimum or Maximum of a Set of Binary Numbers", IBM Tech. Disclosure Bulletin, vol. 25, No. 7A, p. 3318, 12/1982.
IEEE Transactions on Communications, vol. Com-32, No. 5, May 1984, "The Output Distribution of Median Type Filters", Thomas A. Nodes, Member.

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