Amplitude adaptive filter

Details Amplitude adaptive filter Amplitude adaptive filter

1994-02-22

1996-01-30

Envall, Jr., Roy N.

Boots, shoes, and leggings

36472419, G06F 1710

Patent

active

054885760

ABSTRACT:
A digital filter transfer function is implemented using at least two implementing filters, one of which has a transfer function which guarantees an output which is unconditionally within a predefined output compliance range, and the other of which has a transfer function equal to the difference between the overall desired transfer function and the transfer function of the first implementing filter. Typically, the output samples produced by the two implementing filters are summed to provide an overall output sample. However, if the sum of an output sample from one of the implementing filters and the corresponding output sample from the other implementing filter falls either above or below predetermined threshold values, then the output of the first implementing filter, instead of the summed output, is provided as the sample output of the overall filter. Transient undershoots and overshoots are thus prevented, while the response of the filter is degraded only when necessary to avoid compliance range violation.

REFERENCES:
patent: 3895343 (1975-07-01), Farr
patent: 4694414 (1987-09-01), Christopher
patent: 5016280 (1991-05-01), Engebreston et al.
"Analog Filter Design for Video A/D and D/A Converters", Brooktree Corporation, Application Note 35 (1993).

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