Acoustical Science and Technology | |
Harmonic vector excitation coding of speech | |
Masayuki Nishiguchi1  | |
[1] Audio Codec Development Department, Technology Development Group, Sony Corporation | |
关键词: Harmonic coding; VXC; HVXC; CELP; Vector quantization; MPEG-4; | |
DOI : 10.1250/ast.27.375 | |
学科分类:声学和超声波 | |
来源: Acoustical Society of Japan | |
【 摘 要 】
References(19)A coding algorithm for speech called harmonic vector excitation coding (HVXC) has been developed that encodes speech at very low bit rates (2.0–4.0 kbit/s). It breaks speech signals down into two types of segments: voiced segments, for which a parametric representation of harmonic spectral magnitudes of LPC residual signals is used; and unvoiced segments, for which the CELP coding algorithm is used. This combination provides near toll-quality speech at 4.0 kbit/s, and communication-quality speech at 2.0 kbit/s, thus outperforming FS1016 4.8-kbit/s CELP. This paper discusses the encoder and decoder algorithms for HVXC, including fast harmonic synthesis, time scale modification, and pitch-change decoding. Due to its high coding efficiency and new functionality, HVXC has been adopted as the ISO/IEC International Standard for MPEG-4 audio.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912080715589ZK.pdf | 149KB | download |