Variable rate digital filter

Details Variable rate digital filter Variable rate digital filter

1993-08-12

1994-06-28

Malzahn, David H.

Boots, shoes, and leggings

36472417, G06F 1531

Patent

active

053253183

ABSTRACT:
A variable digital filter employs a variable rate sample clock with combinations of various digital filter elements such as an efficient implementation of decimation to achieve various filter realizations allowing a selectable output bandwidth. More specifically, a digital filter apparatus is coupled to receive input analog signals from a fixed anti-aliasing analog filter and optionally includes one or several stages of digital decimation filters, a low-pass filter, an optional equalizer, and an optional high-pass filter each of which may be programmed so as to configure the device with a variety of transfer characteristics. The filter device employs an input sample clock in the range of F-K*F, where, in a specific embodiment K is selected to be 2. The selectable combination of elements and stages used to form the filter needed is operative at a broad range of sample rates over a predetermined bandwidth range without loss of resolution. An extremely simple digital filter with a bandwidth of 1/4 the input sample rate is also shown.

REFERENCES:
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patent: 5010507 (1991-04-01), Kenny
patent: 5138569 (1992-08-01), Valenzuela
Bellanger et al., "Interpolation, extrapolation, and reduction of computation speed in digital filters," IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-22, pp. 231-235, Aug. 1974.
R. R. Shively, "On multistage FIR filters with decimation," IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-23, pp. 353-357, Aug. 1975.
R. E. Crochiere and L. R. Rabiner, "Optimum FIR digital filter implementations for decimation, interpolation, and narrow-band filtering," IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-23, pp. 444-456, Oct. 1975.
P. A. Regaila, et al., "The digital all-pass filter: a versatile signal processing building block," Proc. IEEE, vol. 76, No. 1, Jan. 1988.

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