Periodic and quasi-periodic signals which act as interference in the spectrum of interest is effectively filtered out by using a linear predictive coding filter.

The spectral shaping can be performed using time domain modeling and synthesis such as linear predictive coding (88) or by using subband coding techniques such as fast Fourier transforms.

This arrangement reduces both intra-channel redundancy and inter-channel redundancy in linear predictive analysis-by-synthesis signal encoding.

In order to enhance the speech quality the prediction coefficients are interpolated by an LPC coefficient interpolator (46) to obtain interpolated prediction coefficients for each sub-frame.

The method further includes determining whether overflow is detected based on the linear predictive coding synthesis filter gain and a fixed codebook gain.

If a word is found (66), the linear prediction coding word parameters are extracted (68) from the vocoder data associated with the word and recognition features are calculated (70) from the extracted linear prediction coding word parameters.

A block adaptive linear predictive coding method for encoding a signal having multi-dimensional correlation, such as an image signal as improved by employing multi-dimensional blocks of error signals for making the prediction.

A prediction controller (101) comprises a prediction parameter generator (301) which generates linear prediction coding parameter matrices for the multi channel signal which are then mapped to reflection matrices.

A pole-zero speech analysis method in which cepstral coefficients are first obtained from the Linear Predictive Coding method of analysing a short speech segment.

The encoder utilizes gain normalization wherein LPC (linear predictive coding) gain provides a smoothing factor for combining both open and closed loop gains.

The low-frequency signal portion is coded by a regular narrow-band coder and the high frequency portion is coded using a coder that outputs LPC codes and signal amplitude codes.

LPC designates an experimental linear predictive encoding contributed by Ron Frederick, which is based on an implementation written by Ron Zuckerman posted to the Usenet group comp.dsp on June 26, 1992.