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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Transform Coding Based on Source Filter Model in the MDCT Domain

  • Sung, Jongmo (Broadcasting & Telecommunications Media Research Laboratory, ETRI) ;
  • Ko, Yun-Ho (Department of Mechatronics Engineering, Chungnam National University)
  • Received : 2012.08.29
  • Accepted : 2012.12.06
  • Published : 2013.06.01
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Abstract

State-of-the-art voice codecs have been developed to extend the input bandwidth to enhance quality while maintaining interoperability with a legacy codec. Most of them employ a modified discrete cosine transform (MDCT) for coding their extended band. We propose a source filter model-based coding algorithm of MDCT spectral coefficients, apply it to the ITU-T G.711.1 super wideband (SWB) extension codec, and subjectively test it to validate the model. A subjective test shows a better quality over the standardized SWB codec.

Keywords

References

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