A 5-kHz-Bandwidth Low-Bit-Rate Speech Coder

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Bibliographic Information

Other Title
  • 5kHz帯域低ビットレート音声符号化 : 帯域感と主観品質の関係

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Description

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 equivalent 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.

Journal

  • IPSJ SIG Notes

    IPSJ SIG Notes 29 111-116, 1999-02-18

    Information Processing Society of Japan (IPSJ)

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Details 詳細情報について

  • CRID
    1573950401966140032
  • NII Article ID
    110002935638
  • NII Book ID
    AN10438388
  • ISSN
    09196072
  • Text Lang
    ja
  • Data Source
    • CiNii Articles

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