A 5-kHz-bandwidth low-bit-rate speech coder: Bandwidth, noisiness, and opinion scores

Noboru Harada, Hitoshi Ohmuro, Kazunori Mano

Research output: Contribution to journalArticle

Abstract

With the development of PCs, Internet technology, and mobile communications, the demand for low-bit-rate speech coding schemes as well as for high-information-level natural speech have increased in recent years. While naturalness increases with the use of speech signals of broad frequency bands, more information is needed for coding. In this paper, we propose a 5-kHz-band speech coding scheme that clarifies the relationships between the frequency band feeling, noisiness, and subjective opinions on quality by means of evaluation experiments using multiple frequency bands, while allowing selection between low bit rate and naturalness. The proposed scheme operates in three bit-rate modes, 7.8, 5.75, and 3.95 kbit/s. Subjective quality evaluation tests confirm that the coding scheme achieves quality almost equal to G.729 (3.4-kHz bandwidth, 8 kbit/s) and G.722 (7-kHz bandwidth, 48 kbit/s) at 5.75 kbit/s and quality higher than these at 7.8 kbit/s.

Original languageEnglish
Pages (from-to)110-119
Number of pages10
JournalSystems and Computers in Japan
Volume33
Issue number14
DOIs
Publication statusPublished - 2002 Dec
Externally publishedYes

Fingerprint

Frequency bands
Speech coding
Bandwidth
Internet
Communication
Experiments

Keywords

  • 5-kHz bandwidth
  • CELP
  • Speech coding

ASJC Scopus subject areas

  • Hardware and Architecture
  • Information Systems
  • Theoretical Computer Science
  • Computational Theory and Mathematics

Cite this

A 5-kHz-bandwidth low-bit-rate speech coder : Bandwidth, noisiness, and opinion scores. / Harada, Noboru; Ohmuro, Hitoshi; Mano, Kazunori.

In: Systems and Computers in Japan, Vol. 33, No. 14, 12.2002, p. 110-119.

Research output: Contribution to journalArticle

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