View source for Filterbank

Filterbank as used in all mpeg1 layers encoding and [[MPC]] encoding (polyphase analysis filterbank), is a set of [[bandpass filter]], which divide the audio signal into 32 equal-width [[frequency]] [[subband]]. So, with cd-audio's 22.05kHz [[bandwidth]], the width of 1 [[subband]] is about 689Hz (32*689Hz=22.05kHz). Filterbank and its inverse are not lossless transformations. Even without [[quantization]], the inverse transformation cannot perfectly recover the original signal. Filterbank is designed so, that the error introduced is small and inaudible.

[[Category:Technical]]
[[Category:MP3]]