Wyniki wyszukiwania dla: JAKOŚĆ DŹWIEKU

• Transient detection for speech coding applications

  Publikacja

  • G. Szwoch
  • M. Kulesza
  • A. Czyżewski

  - International Journal of Computer Science and Network Security - Rok 2006

  Signal quality in speech codecs may be improved by selecting transients from speech signal and encoding them using a suitable method. This paper presents an algorithm for transient detection in speech signal. This algorithm operates in several frequency bands. Transient detection functions are calculated from energy measured in short frames of the signal. The final selection of transient frames is based on results of detection...

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• Audio codec employing frequency-derived tonality measure

  Publikacja

  • M. Kulesza
  • A. Czyżewski

  - Rok 2009

  A transform codec employing efficient algorithm for detection of spectral tonal components is presented. The tonality measure used in MPEG psychoacoustic model is replaced with the method providing adequate tonality estimates even if the tonal components are deeply frequency modulated. The reliability of hearing threshold estimated using psychoacoustic model with standardized tonality measure and the proposed one is investigated...