Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1992-06-11
1995-07-25
Chin, Stephen
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
381 36, H04B 166
Patent
active
054369401
ABSTRACT:
M-channel pseudo-quadrature-mirror-filter (QMF) banks using a prototype filter having a linear-phase spectral-factor of a 2M.sup.th band filter. The overall transfer function of the analysis filter/synthesis filter system is a delay, and the aliasing cancellation has all the significant aliasing terms canceled. Consequently, the aliasing level at the output of the pseudo-QMF banks is comparable to the stopband attenuation of the prototype filter, with the error at the output of the analysis filter/synthesis filter system approximately equal to the aliasing error at the level of the stopband attenuation. The pseudo-QMF banks have the stopband attenuation of the analysis filters and thus synthesis filters of -100 dB. The resulting reconstruction error is also on the order of -100 dB. Optimization of the pseudo-QMF banks by a quadratic-constrained least-squares formulation converges very fast as both a cost function and constraints are quadratic functions with respect to unknown parameters, providing a much higher stopband attenuation compared to previous filter banks.
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Bocure Tesfaldet
Chin Stephen
Massachusetts Institute of Technology
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