Interpolator/decimator filter structure and a notch filter there

Details Interpolator/decimator filter structure and a notch filter there Interpolator/decimator filter structure and a notch filter there

1986-08-08

1990-03-13

Harkcom, Gary V.

Boots, shoes, and leggings

36472401, G06F 1531, H03H 1704

Patent

active

049087878

ABSTRACT:
A filter structure including a notch filter is designed to have a transmission zero at a frequency slightly displaced from one half of the lower sampling rate of the interpolator/decimator, and thus providing increase in attenuation at the half-rate frequency. The notch filter is comprised of two like all-pass-network filters and has feed forward and feedback connections, the latter connection including a coefficient multiplier. The feedback connection is made between a tapped output of the second of the network filters and an input node. The tapped filter is characterized by throughput and a tapped output transform functions X(Z) and Y(Z) given by the following expressions:

REFERENCES:
patent: 4694414 (1987-09-01), Christopher
"Efficient Sampling Rate Alteration Using Recursive (IIR) Digital Filters", by R. Ansari et al., IEEE Trans. Acoust., Speech Sig. Proc. vol. ASSP-31, No. 6, pp. 1366-1373, Dec. 1983.
"Digital Signal Processing Schemes for Efficient Interpolation and Decimation", by R. A. Valanzuala et al., reported in IEEE Proc., vol. 130, No. 6, pp. 225-234, Dec. 1983.

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