Interframe differential vector coding of line spectrum frequencies

Authors:
Engin Erzin;A. Enis Çetin
Affiliations:
Dept. of Electrical and Electronics Engineering, Bilkent University, Bilkent, Ankara, Turkey;Dept. of Electrical and Electronics Engineering, Bilkent University, Bilkent, Ankara, Turkey
Venue:
ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: speech processing - Volume II
Year:
1993

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Abstract

Line Spectrum Frequencies (LSF's) uniquely represent the Linear Predictive Coding (LPC) filter of a speech frame. In many vocoders LSF's are used to encode the LPC parameters. In this paper, an interframe differential coding scheme is presented for the LSF's. The LSF's of the current speech frame are predicted by using both the LSF's of the previous frame and some of the LSF's of the current frame. Then, the difference vector resulting from prediction is vector quantized.