High quality split band LPC vocoder operating at low bit rates

@article{Atkinson1997HighQS,
  title={High quality split band LPC vocoder operating at low bit rates},
  author={Ian A. Atkinson and Suat Yeldener and Ahmet M. Kondoz},
  journal={1997 IEEE International Conference on Acoustics, Speech, and Signal Processing},
  year={1997},
  volume={2},
  pages={1559-1562 vol.2}
}
LPC based speech coders operating at bit rates below 3.0 kbits/sec are usually associated with buzzy or metallic artefacts in the synthetic speech. These are mainly attributable to the simplifying assumptions made about the excitation source, which are usually required to maintain such low bit rates. A new LPC vocoder is presented which splits the LPC excitation into two frequency bands using a variable cut-off frequency. The lower band is responsible for representing the voiced parts of speech… CONTINUE READING

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