High quality audio coding using multipulse LPC and wavelet decomposition
Most current work in the area of high quality audio coding falls under one of two categories: transform or sub-band coding. LPC coders since based on modelling human voice production systems are found to be inappropriate in modelling music and other non-speech sounds. A more improved model for such signals is shown to be the multipulse LPC model. In this paper we propose to improve the quality of the multipulse model by first passing the signal of interest through a filter bank and then extracting the multipulse parameters from each of the bandpass filter outputs. The idea of the wavelet decomposition is utilised for the design of the filter bank. Both the multipulse model and the wavelet decomposition are well known. But a combination of both has not been exploited yet. This combination is expected to lead to a new way in high quality low bit rate audio coding.