A model of LPC excitation in terms of eigenvectors of the autocorrelation matrix of the impulse response of the LPC filter
Bishnu Saroop Atal · International Conference on Acoustics, Speech, and Signal Processing · 2003
A description is presented of a framework for developing compact and accurate representation of LPC (linear predictive coding) excitation. In this representation, the excitation waveform is expressed as a linear combination of the eigenvectors of the autocorrelation matrix of the LPC filter's impulse response. This representation allows a systematic study of changes in the filter excitation on the speech output. The author presents results on the precision that is necessary in the excitation without producing perceptible distortion in the output speech signal and an estimate of the minimum number of bits necessary for accurate reproduction of the excitation.>