Line spectral frequencies (LSF) are widely used in the field of speech coding. Due to its properties, the LSF are qualified for the quantisation and the efficient compression of speech signals. In this paper we introduce the line cepstral quefrencies (LCQ). They are derived from the cepstrum in the same manner as the LSF are derived from linear predictive coding (LPC) features. We show that the combination of the pole-zero transfer function of the cepstrum with the properties of LSF offers advantages for speech coding. We apply the LCQ features to compress an acoustic inventory, which is used for a low resource speech synthesis. It is shown that the compression performance of the LCQ features is better than those of the LSF features in terms of the mean spectral distance to the original inventory.
Bibliographic reference. Strecha, Guntram / Eichner, Matthias / Hoffmann, Rüdiger (2007): "Line cepstral quefrencies and their use for acoustic inventory coding", In INTERSPEECH-2007, 2873-2876.