Digital sub-band filters

Details Digital sub-band filters Digital sub-band filters

1984-03-21

1988-03-01

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

047291125

ABSTRACT:
A digital signal is separated into a lower frequency subband and a high frequency subband using quadrature mirror filters. The singularities of each filter, represented in the z-plane, comprise a zero on the real axis and unit radius, with other groups each contributing a symmetrical delay response. At least one such group has a pole at r, .theta. and a zero at 1/r, .pi.- .theta..

REFERENCES:
patent: 4135057 (1979-01-01), Bayless, Sr. et al.
patent: 4232373 (1980-11-01), Jackson et al.
patent: 4317092 (1982-02-01), Potter
patent: 4360793 (1982-11-01), Rhodes et al.
patent: 4393272 (1983-07-01), Itakura et al.
patent: 4418324 (1983-11-01), Higgins
patent: 4422156 (1983-12-01), Sand
patent: 4472785 (1984-09-01), Kasuga
patent: 4491799 (1985-01-01), Giardenelli
patent: 4507794 (1985-03-01), Jones et al.
patent: 4513263 (1985-04-01), Minnis
patent: 4520499 (1985-05-01), Montlick et al.
patent: 4547819 (1985-10-01), Meitner et al.
patent: 4554858 (1985-11-01), Wachi et al.
patent: 4586193 (1986-04-01), Seiler et al.
IEE ICASSP 1977, "Application of Quadrature Mirror Filtering to Split Band Voice Coding Schemes"; D. Esteban and C. Galand; IBM.
The Bell System Technical Journal, May, Jun. 1977, "On the Design of Sub-Band Coders for Low-Bit-Rate Speech Communications, by R. E. Crochiere, pp. 748-771.
The Bell System Technical Journal, Oct. 1976, "Digital Coding of Speech in Sub-Bands, by R. E. Crochiere et al, pp. 1069-1085.
ICASSP 79-1979 IEE International Conference on Acoustics, Speech & Signal Processing, International Inn, Washington, D.C. (US), Apr. 2-4, 1979, R. A. Gabel: "On the Design of Complementary Filters", pp. 805-808.
Signal Processing Theories and Applications, Proceedings of EUSIPCO-80, First European Signal Processing Conference, Lausanne (CH), Tor A. Ramstad et al: "Sub-Band Coder Design Using Recursive Quadrature Mirror Filters", pp. 747-752.
"Sub-Band Coder Design Incorporating Recursive Quadrature Filters and Optimum ADPCM Coders", by Thomas P. Barnwell, III, IEEE.
Transactions on Acoustics, Speech and Signal Processing, vol. ASSP30, No. 5, Oct. 1982, pp. 751-765.

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