Multiple-input digital filter

Details Multiple-input digital filter Multiple-input digital filter

1988-05-24

1990-06-05

Harkcom, Gary V.

Boots, shoes, and leggings

36472401, G06F 738

Patent

active

049319728

ABSTRACT:
A multiple-input digital filter capable of filtering a plurality of digital input signals with a single filtering device first latches the input signals and then sequentially selects each of the digital input signals for output to a counter circuit. The counter circuit, which is preset by the previous count value for the corresponding digital input signal, counts up or down depending on the digital input signal. When the count value reaches its maximum, a decision value signal is set for the corresponding digital input signal until the count value for that digital input signal returns to the minimum value. The count values are stored in a shift register which supplies the count value corresponding to the digital input signal as a preset value to the counter. A second shift register stores the decision values corresponding to each of the digital input signals which are then latched for simultaneous output.

REFERENCES:
patent: 3732409 (1973-05-01), Fletcher et al.
patent: 4081130 (1978-03-01), Bolgiano
patent: 4091236 (1978-05-01), Chen
patent: 4101964 (1978-07-01), Betts
patent: 4136912 (1979-01-01), Hesse et al.
patent: 4216463 (1980-08-01), Backof, Jr. et al.
patent: 4327335 (1982-04-01), Missoat et al.
patent: 4442500 (1984-04-01), Kongable et al.
Glaser, "Multiplexing of Analog systems with Application to the W-Path Filter", Proc. of the 13th midwest symposium on circuit theory, Minneapolis, Minn.; May 7-8, 1970; III.1.1-III.1.10.

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