FIELD: radio engineering, communication.
SUBSTANCE: specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is described. The method substantially reduces artifacts due to spectrum aliasing arising from independent modifications of subband signals, for example when using a filter bank as a spectral equaliser. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalisers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.
EFFECT: method of reconstructing filter banks generating a low level of errors.
21 cl, 1 tbl, 5 dwg
