Pseudo-three-tap pitch prediction filters

  • Authors:

  • Qian Yasheng;Peter Kabal

  • Affiliations:

  • Dept. of Electrical Eng., McGill University, Montreal, Quebec, Canada and Dept. of Electronic Eng., Tsinghua University, Beijing, China;Dept. of Electrical Eng., McGill University, Montreal, Quebec, Canada

  • Venue:
  • ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: speech processing - Volume II
  • Year:
  • 1993

Quantified Score

Hi-index 0.00

Visualization

Abstract

Pitch filters play an important role in high quality medium and low rate speech coders. We propose a pseudo-three-tap pitch filter with one or two degrees of freedom of the prediction coefficients, which gives a higher pitch prediction gain and also a more desirable frequency response than a one-tap pitch prediction filter. First, we describe an analysis model for the pseudo-three-tap pitch filter. Then, we apply the pseudo-three-tap concept together with a fractional pitch lag. The pitch prediction gain and frequency response of the pseudo-three-tap pitch filters are compared to a one-tap and three-tap pitch predictors with an integer or a non-integer pitch lag. The pseudo-three-tap pitch filter with one degree of freedom outperforms a conventional one-tap pitch filter. Even better is a pseudo-three-tap filter which switches between two parameter values.