Phase adjustment in waveform interpolation

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

This paper describes a method of improving the quality of the Waveform Interpolation (WI) speech coder by adjustment of the phase information. In WI, a slowly-evolving waveform (SEW) and a rapidly-evolving waveform (REW) represent the periodic and the non-periodic part of the signal. The phase of the synthesized signal is determined by the SEW and REW, and thus the correct quantization of these parameters are important to producing natural speech quality. A method is described, whereby the phase of the synthesized signal is adjusted by modifying the quantized REW spectrum as a function of the fundamental frequency. This essentially attempts to correct the discrepancies in phase that arise due to variation in pitch and also accounts for the difference in noise sensitivity between female and male speech. The overall effect would be the same if multiple codebooks (depending on pitch) were used to code the REW spectrum. Experimental results confirm that the new method results in significantly improved performance.

Original languageEnglish
Pages (from-to)261-264
Number of pages4
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Volume1
Publication statusPublished - 1999 Jan 1

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Interpolation

All Science Journal Classification (ASJC) codes

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

Cite this

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title = "Phase adjustment in waveform interpolation",
abstract = "This paper describes a method of improving the quality of the Waveform Interpolation (WI) speech coder by adjustment of the phase information. In WI, a slowly-evolving waveform (SEW) and a rapidly-evolving waveform (REW) represent the periodic and the non-periodic part of the signal. The phase of the synthesized signal is determined by the SEW and REW, and thus the correct quantization of these parameters are important to producing natural speech quality. A method is described, whereby the phase of the synthesized signal is adjusted by modifying the quantized REW spectrum as a function of the fundamental frequency. This essentially attempts to correct the discrepancies in phase that arise due to variation in pitch and also accounts for the difference in noise sensitivity between female and male speech. The overall effect would be the same if multiple codebooks (depending on pitch) were used to code the REW spectrum. Experimental results confirm that the new method results in significantly improved performance.",
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Phase adjustment in waveform interpolation. / Kang, Hong Goo; Sen, D.

In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, Vol. 1, 01.01.1999, p. 261-264.

Research output: Contribution to journalConference article

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