Improving the transcoding capability of speech coders

Hong Goo Kang, Hong Kook Kim, Richard V. Cox

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


With the trend of merging various communication networks, a need arises to provide transcoding between different speech coding formats. Presently this means cross tandeming the two coders in each case. This results in both quality loss and extra delay. A possible alternative is using a bitstream mapping approach that directly converts parameter values. For several standard coders having a similar coding structure, it should be possible to generate comparable or better quality without adding much delay or complexity. This paper proposes a bitstream mapping method between ITU-T Recommendation G.729 and TIA IS-641. Informal listening tests and the perceptual subjective quality measure (PSQM) scores show that the proposed method has better quality than the cross tandeming method, while it has at least 5 ms less delay and six times less computation.

Original languageEnglish
Pages (from-to)24-33
Number of pages10
JournalIEEE Transactions on Multimedia
Issue number1
Publication statusPublished - 2003 Mar

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Media Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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