Comparison of Two Speech and Audio Coders at 8 kb/s from the Viewpoints of Coding Scheme and Quality (Special Issue on Performance and Quality of Service (QoS) of Multimedia Networks
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概要
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Low bit-rate speech and audio codings are key technologies for multimedia communications. A number of coding scheme have been developed for various applications. In Internet application, good speech and audio quality at very low bit-rate (8-16 kb/s) is valuable. Two recently proposed speech and audio-coding schemes, CS-ACELP (Conjugate Structure Algebraic Code Excited Linear Prediction, standardized by the ITU-T in Recommendation G. 729) and TwinVQ (Transform-domein Weighted INterleave Vector Quantization, one of the candidates for MPEG-4 audio) were compared from the viewpoints of coding schemes and quality. Although there are significant differences in their basic structures and frame lengths, this paper describes that both use the same compression techniques, such as LPC (Linear Predictive Coding) -analysis pitch-period estimation and vector quantization. While CS-ACELP provides toll quality for speech at 8 kb/s, the quality it provides for music signals is insufficient. The Twin VQ transform coder is based on LPC and vector quantization and is also capable of operating at 8 kb/s. Evaluation of these two schemes in terms of their fundamental technologies, quality, delay, and complexity showed that the quality of Twin VQ for music signals is better than that of CS-ACELP, and that the quality of CS-ACELP is better for speech signals. Therefore, Twin VQ may be better suited for one-directional Internet applications, and CS-ACELP may be better for two-directional communication.
- 社団法人電子情報通信学会の論文
- 1998-11-25
著者
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Kaneko T
Redox Regulation Research Group Tokyo Metropolitan Institute Of Gerontology
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MORIYA Takehiro
NTT Cyber Space Laboratories NTT Corporation
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IWAKAMI Naoki
NTT Cyber Space Laboratories
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KITAWAKI Nobuhiko
University of Tsukuba
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MORIYA Takehiro
NTT Human Interface Labs.
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KANEKO Takao
NTT Human Interface Labs.
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IWAKAMI Naoki
NTT Human Interface Labs.
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KITAWAKI Nobuhiko
Graduate School of Systems and Information Engineering, University of Tsukuba
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Moriya T
Ntt Cyber Space Laboratories Ntt Corporation
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Moriya Takehiro
Ntt Human Interface Laboratories
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Kitawaki N
Graduate School Of Systems And Information Engineering University Of Tsukuba
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