Digital filter bank

Details Digital filter bank Digital filter bank

1981-03-19

1983-07-12

Smith, Jerry

Boots, shoes, and leggings

370 50, 370 70, G06F 1531

Patent

active

043934560

ABSTRACT:
A digital filter bank (10) which has a discrete cosine transform section (12) and a polyphase network section (14) has the polyphase network section configured with a plurality of single input-double output digital filters (16). The filters have one of their outputs (36) independent of their present input signal. This permits a single multiplier-accumulator to use a "memory swapping" procedure to accumulate all the requisite information from a complementary pair of the filters and to perform the necessary operations on it to compute an output value, while clearing the accumulator only once each sampling period.

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patent: 3971922 (1976-07-01), Bellanger et al.
patent: 4237551 (1980-12-01), Narasimha
Fumio Takahata et al., "Development of TDM/FDM Transmultiplexer", IEEE, National Telecommunications Conference, 1977, L.A., Ca.
M. G. Bellanger et al., "TDM-FDM Transmultiplexer: Digital Polyphase and FFT", IEEE Trans. On Comm., Com-22, No. 9, 9-1974, pp. 1199-1205.
G. Bonnerot et al., "Digital Processing Techniques in the 60 Channel Transmultiplexer", IEEE Trans. On Comm., Com-26, No. 5, 5-1978, pp. 698-706.
S. L. Freeny et al., "Design of Digital Filters for an All Digital FDM-TDM Translator", IEEE Tran. On Cir. Theory, CT-18, No. 6, 11-1971, pp. 702-711.
S. A. Freeny et al., "Systems Analysis of a TDM-FDM Translator/Digital A-Type Channel Bank", IEEE Trans. on Comm. Tech., COM-19, No. 6, 12-1971, pp. 1050-1059.
M. J. Narasimha et al., "Design of a 24-Channel Transmultiplexer", IEEE Trans. On Acoustics, Speech, and Sig. Proc., ASSP-27, No. 6, 12-1979, pp. 752-762.
J. Makhoul, "A Fast Cosine Transform in One and Two Dimensions", IEEE Trans. on Acoustics, Speech, and Sig. Proc., ASSP-28, No. 1, 2-1980, pp. 27-34.
P. Vary et al., "A Short-Time Spectrum Analyzer With Polyphase-Network and DFT", Signal Processing 2, vol. 2, No. 1, 1-1980, pp. 55-65.
P. Vary, "On the Design of Digital Filter Banks Based on a Modified Principle of Polyphase", AEU Band 33, Heft 7/8, 1979, pp. 293-300.
M. G. Bellanger et al., "Digital Filtering by Polyphase Network: Application to Sample-Rate Alteration and Filter Banks", IEEE Trans. on Acoustics, Speech, and Sig. Proc., ASSP-24, No. 2, 4-1976, pp. 109-114.

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