Variable frame rate speech coding using optimal interpolation

Sin-Horng Chen*, Chii Jen Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A VFR LPC vocoder using optimal interpolation is presented in this paper. In the encoder, some representative frames of an utterance are selected for transmission. In the decoder, LPC parameters of all untransmitted frames are restored by optimal interpolation. Simulation results show that this coding scheme outperforms the conventional VFR vocoder using linear interpolation. By incorporating contour quantization of gain and pitch information, a low variable-rate LPC vocoder is realized. An informal listening test shows that very high intelligible reconstructed speech was obtained at an average data rate of 300 bps.

Original languageEnglish
Pages (from-to)2215-2219
Number of pages5
JournalIEEE Transactions on Communications
Issue number6
StatePublished - 1 Jun 1994

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