Speech Coding Software DualSpeech

Hitoshi Ohmuro, Kazunori Mano

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Low-cost highly-efficient speech coding is important for personal multimedia communications. In particular, the demand for real-time speech compression on a personal computer has been increasing. In this paper, we describe the algorithm of the DualSpeech codec developed by NTT and outline the software product. DualSpeech achieves real-time high-quality speech compression and decompression without any extra signal processors. The bit rate is 7.4 kbit/s (high-quality mode) or 4.6 kbit/s (low-bit-rate mode). The quality of the decoded speech is equivalent to that of ITU-T G.726 (ADPCM) or a mobile telephone (PSI-CELP). To achieve low complexity and high quality, we applied new speech modeling and high-speed code searching. DualSpeech software is now available not only for general computers but also for cheap RISC processors.

Original languageEnglish
Pages (from-to)549-554
Number of pages6
JournalNTT R and D
Volume47
Issue number5
Publication statusPublished - 1998
Externally publishedYes

Fingerprint

Speech coding
Reduced instruction set computing
Telephone
Personal computers
Communication
Costs

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Ohmuro, H., & Mano, K. (1998). Speech Coding Software DualSpeech. NTT R and D, 47(5), 549-554.

Speech Coding Software DualSpeech. / Ohmuro, Hitoshi; Mano, Kazunori.

In: NTT R and D, Vol. 47, No. 5, 1998, p. 549-554.

Research output: Contribution to journalArticle

Ohmuro, H & Mano, K 1998, 'Speech Coding Software DualSpeech', NTT R and D, vol. 47, no. 5, pp. 549-554.
Ohmuro, Hitoshi ; Mano, Kazunori. / Speech Coding Software DualSpeech. In: NTT R and D. 1998 ; Vol. 47, No. 5. pp. 549-554.
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