Signal analysing and synthesizing filter bank system

Details Signal analysing and synthesizing filter bank system Signal analysing and synthesizing filter bank system

1986-01-27

1989-01-17

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

047991798

ABSTRACT:
In a signal analysing and synthesizing filter bank system, the analysing bank receives a signal sampled at the rate f.sub.e and produces N contiguous subbank signals sampled at the rate f.sub.e /N. From the subband signals the synthesizing bank must recover the incoming signal. These filter banks are formed by modulation of a prototype filter by sinusoidal signals which, for subband k (O.ltoreq.k.ltoreq.N=1), have a frequency (2k30 1)f.sub.e /(4N) and respective phases +(2k+1).pi./4 and -(2k+1).pi./4 for the analysing and synthesizing banks. These signals are furthermore delayed by a time delay (N.sub.c -1)/2f.sub.e), where N.sub.c is the number of coefficients of the prototype filter. Preferably, the analysing bank is realized by the cascade arrangement of an N-branch polyphase network (12) and a double-odd discrete cosine transform calculating arrangement (14) and the synthesizing bank is realized by the cascade arrangement of a double-odd discrete cosine transform calculating arrangement (15) and an N-branch polyphase network (17).

REFERENCES:
patent: 4131764 (1978-12-01), Classen et al.
patent: 4623980 (1986-11-01), Vary
Bellanger et al., "TDM-FDM Transmultiplexer:Digital Polyphase and FFT", IEEE Trans. on Communications, vol. Com-22, No. 9 Sep. 1974, pp. 1199-1205.
Rothweiler, "Polyphase Quadrature Filter--A New Subband Coding Technique" Proceedings, IEEE Inter. Conference on Acoustics, Speech and Signal Processing, vol. 3, Apr. 1983 (ICASSP 83), pp. 1280-1283.
Nussbaumer et al., "Computationally Efficient QMF Filter Banks" Proeedings, IEEE Inter. Conference on Acoustics, Speech and signal Processing, vol. 1, Mar. 1984 (ICASSP 84), pp. 11.3.1-11.3.4.
Nussbaumer, "Pseudo QMF Filter Bank", IBM Tech. Discl. Bull., vol. 24, No. 6 Nov. 1981, pp. 3081-3087.
Croisier et al., "Perfect Channel Splitting by use of Interpolation/Decimation/Tree Decomposition Techniques", Proceedings of the International Conference on Information Sciences and Systems, pp. 443-446 (Patras, Aug. 1976).

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