Harmonic vector excitation coding of speech

• Nishiguchi Masayuki

  Audio Codec Development Department, Technology Development Group, Sony Corporation

抄録

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.

収録刊行物

• Acoustical Science and Technology

  Acoustical Science and Technology 27 (6), 375-383, 2006

  一般社団法人 日本音響学会

キーワード

• Harmonic coding
• VXC
• HVXC
• CELP
• Vector quantization
• MPEG-4

詳細情報

• CRID: 1390282680067034112
• NII論文ID: 110004836513
• NII書誌ID: AA11501808
• DOI: 10.1250/ast.27.375
• ISSN: 13475177
• ISSN: 03694232
• ISSN: 13463969
• NDL書誌ID: 8614969
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8614969
• Web Site: http://www.jstage.jst.go.jp/article/ast/27/6/27_6_375/_pdf
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10572942
• 本文言語コード: en
• データソース種別:
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