A method for optimising LPC filters in linear prediction based speech coders is described. The optimisation process compensates for errors incurred through coding the excitation signal, providing an improvement in the quality of the decoded speech, with no increase in bit rate.
Pérez, D., Sandler, M. Re-optimisation of lpc filters for multi-pulse coded excitation. "Electronics Letters", Juny 1999, vol. 35, núm. 13, p. 1058-1059.