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 [BibTeX] [Marc21]
On Compressibility of Neural Network phonological Features for Low Bit Rate Speech Coding
Type of publication: Conference paper
Citation: Asaei_INTERSPEECH_2015
Publication status: Published
Booktitle: Proceeding of Interspeech
Year: 2015
Pages: 418-422
Publisher: ISCA
Abstract: Phonological features extracted by neural network have shown interesting potential for low bit rate speech vocoding. The span of phonological features is wider than the span of phonetic features, and thus fewer frames need to be transmitted. Moreover, the binary nature of phonological features enables a higher compression ratio at minor quality cost. In this paper, we study the compressibility and structured sparsity of the phonological features. We propose a compressive sampling framework for speech coding and sparse reconstruction for decoding prior to synthesis. Compressive sampling is found to be a principled way for compression in contrast to the conventional pruning approach; it leads to $50$\% reduction in the bit-rate for better or equal quality of the decoded speech. Furthermore, exploiting the structured sparsity and binary characteristic of these features have shown to enable very low bit-rate coding at 700 bps with negligible quality loss; this coding scheme imposes no latency. If we consider a latency of $256$~ms for supra-segmental structures, the rate of $250-350$~bps is achieved.
Keywords: Compressive sampling, Low bit rate speech vocoding, Phonological features, Structured sparsity
Projects Idiap
PHASER 200021-153507
Authors Asaei, Afsaneh
Cernak, Milos
Bourlard, Hervé
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  • Asaei_INTERSPEECH_2015.pdf