Quality assessment of CS-ACELP

Shinji Hayashi, Akitoshi Kataoka, Takehiro Moriya, Takap Kaneko

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The CS-ACELP (Conjugate-Structure Algebraic Code-Excited Linear Prediction) algorithm approved as 8kbit/s Speech Coding Draft Recommendation G.729 by ITU (International Telecommunication Union) is designed to have quality no worse than current Recommendation G.726 ADPCM (Adaptive Differential Pulse Code Modulation) at 32kbit/s. This paper presents the results of subjective quality tests for characterizing G.729 using Japanese, English, French, German and Italian speech. The CS-ACELP codec achieves commercial telephone quality under channel error-free conditions. It meets all the requirements under random-bit-error conditions against various input levels including two-stage transcoding. Furthermore, it is less sensitive than ADPCM to the burst errors that occur in mobile radio channels.

Original languageEnglish
Pages (from-to)337-342
Number of pages6
JournalNTT R and D
Issue number4
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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