A speech coder based on decomposition of characteristic waveforms

@article{Kleijn1995ASC,
  title={A speech coder based on decomposition of characteristic waveforms},
  author={W. Kleijn and Jesper Haagen},
  journal={1995 International Conference on Acoustics, Speech, and Signal Processing},
  year={1995},
  volume={1},
  pages={508-511 vol.1},
  url={https://api.semanticscholar.org/CorpusID:9105323}
}
A 2.4 kb/s coder using waveform interpolation principles to represent the speech signal as an evolving characteristic waveform (CW) and a significant increase in coding efficiency is obtained by coding these two components separately.
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14 References

Encoding speech using prototype waveforms

The coding method is easily combined with existing LP-based speech coders, such as CELP, for unvoiced signals and excellent voiced speech quality is obtained at rates between 3.0 and 4.0 kb/s.

Continuous representations in linear predictive coding

A novel method of coding voiced speech is introduced, which transmits an encoded prototype waveform at 20-30 ms intervals, and is quantized using analysis-by-synthesis methods, which results in excellent speech quality at rates between 3.0 and 4.0 kb/s.

Improvements in 2.4 kbps high-quality speech coding

An algorithm for 2.4 kb/s speech coding is described, which results in a better compromise between bit allocation for short-term quantization and residual coding and an improved high-frequency regeneration.

Transformation and decomposition of the speech signal for coding

The decomposition of the characteristic waveform is decomposed into a slowly evolving waveform and a rapidly evolving waveforms, representing the quasi-periodic and other components of speech, respectively, which allows efficient coding of voiced and unvoiced speech at bit rates between 2 and 8 kb/s.

A mixed prototype waveform/CELP coder for sub 3 kbit/s

The authors address problems by using a prototype waveform coder for voiced frames while retaining a CELP algorithm for unvoiced frames for sub-3 kbit/s coding and two coding schemes for the prototypes are discussed.

High-quality speech coding at 2.4 to 4.0 kbit/s based on time-frequency interpolation

The author presents a novel algorithm for high-quality coding and demonstrates the advantage of the proposed coder over the conventional CELP (code-excited linear prediction) algorithm for low rate…

Real-time vector APC speech coding at 4800 bps with adaptive postfiltering

An improved Vector APC (VAPC) speech coder at 4800 bps produces speech with very good communications quality while maintaining a complexity low enough to allow a real-time implementation with at most…

Low-bit-rate speech coding using a two-dimensional transform of residual signals and waveform interpolation

Two efficient excitation coding schemes that use a pitch synchronous two-dimensional Fourier transform of linear prediction residual signals and prototype waveform interpolation (PWI) coding using smoothed prototype waveforms are proposed.

Performance of noise excitation for unvoiced speech

This paper addresses the question what perceptual quality can be achieved for unvoiced speech by a linear model with white noise excitation and demonstrates that this linear model results in unvoicing speech of high perceptual quality.

Synthesis of breathy vowels: Some research methods