Presentation	1999/2/19 A 5-kHz-Bandwidth Low-Bit-Rate Speech Coder Noboru Harada, Hitoshi Ohmuro,
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Abstract(in English)	In this paper, we propose a 5-kHz-bandwidth speech coder. In order to achieve both low bit-rate and naturalness, 5-kHz-bandwidth speech signals are used (instead of 3.4 kHz or 7 kHz). The speech signals under consideration are band-limited to 5 kHz and are sampled at 11.025 kHz. Subjective tests (CMOS and MOS) indicated that a 5-kHz-bandwidth is effective for the speech coders. It makes the speech much more natural than 3.4 kHz coders and operates at a lower bit rate than that of 7-kHz-bandwidth coders. The MOS and CMOS showed that the quality of this coder (5 kHz, 7.8 kbit/s) is better than that of the G.729 (3.4 kHz, 8 kbit/s), G.722 (7 kHz,48 kbit/s) and equivalenet to that of G.729 annex E (3.4 kHz, 12 kbit/s). We also determine the relationship among characterizations of objective quality, bandwidth and S/N ratios.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	speech coder / 5kHz-bandwidth / low bit rate
Paper #	SP98-144
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Conference Information
Committee	SP
Conference Date	1999/2/19(1days)
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Paper Information
Registration To	Speech (SP)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	A 5-kHz-Bandwidth Low-Bit-Rate Speech Coder
Sub Title (in English)
Keyword(1)	speech coder
Keyword(2)	5kHz-bandwidth
Keyword(3)	low bit rate
1st Author's Name	Noboru Harada
1st Author's Affiliation	NTT Cyber Space Laboratories()
2nd Author's Name	Hitoshi Ohmuro
2nd Author's Affiliation	NTT Cyber Space Laboratories
Date	1999/2/19
Paper #	SP98-144
Volume (vol)	vol.98
Number (no)	611
Page	pp.pp.-
#Pages	6
Date of Issue