System and method of producing adaptive FIR digital filter with

Details System and method of producing adaptive FIR digital filter with System and method of producing adaptive FIR digital filter with

1992-11-02

1993-12-21

Nguyen, Long T.

Boots, shoes, and leggings

G06F 1531

Patent

active

052726568

ABSTRACT:
A filter and method of adapting a digital filter provides a single fixed finite impulse response (FIR) filter adaptively from measured data, in a manner whereby the filter's frequency and time resolution can be controlled. The resulting filter exhibits properties which allow it to be efficiently implemented in various multi-rate configurations. Specifically, the system and method produce an FIR filter with high resolution at low frequencies by having a large number of coefficients, but reduces resolution at higher frequencies by allowing only a fraction of the coefficients to adapt to the high frequency part of the signal. This is accomplished by using a multi-rate, segmented adaptation procedure, such that resolution and bandwidth are controlled independently at each state. If desired, the resulting filter can be made to approximate constant Q resolution. In addition, by adapting only a short part of the filter at a time, misadjustment is minimized.

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