Improvement issues on transcoding algorithms: For the flexible usage to the various pairs of speech codec

Jin Kyu Choi, Chang Heon Lee, Hong Goo Kang, Young Cheol Park, Dae Hee Youn

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


This paper describes important issues on transcoding between different speech codecs by considering the paradigms of source and target coders, Conventional transcoding algorithms on LSP, pitch and adaptive/fixed codebook conversion are refined with regard to the structure of coders. In addition, a new perceptual weighting filter that plays a role in post-filter and perceptual weighting filter together is proposed to further improve the performance. The performance of the proposed algorithms is verified in step-by-step manner with the examples of transcoding between AMR, G.723.1 and G.729. By employing the proposed algorithm to the transcoders, the complexity is reduced by about 20%-76.88% and quality is also improved compared to conventional approaches.

Original languageEnglish
Pages (from-to)I269-I272
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Publication statusPublished - 2004
EventProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada
Duration: 2004 May 172004 May 21

All Science Journal Classification (ASJC) codes

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

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