WARPED LOW-ORDER MODELING OF MUSICAL MODELING

Aalto Dept. Sig. Proc. and Acoust. / Research

 

Paper title

Warped low-order modeling of musical tones

Authors

Rémi Mignot  (1), Heidi-Maria Lehtonen (1), and Vesa Välimäki (1)
(1) Dept. of Signal Processing and Acoustics, Aalto University Espoo, Finland

Abstract

Source-filter modeling of musical tones requires a filter model for the spectral envelope of the signal. Since the perceptual frequency resolution is best at low frequencies, frequency warping has been previously shown to improve spectral envelope estimation of audio signals. In this paper, considering low-order modeling for harmonic tones, we investigate the perceptual performance of three warped models which extend the filter models: Linear Prediction Coding (LPC), True-Envelope based Linear Prediction (TE-LPC), and Discrete All-Pole method (DAP). The modified TE-LPC method, called the Warped True-envelope Linear Prediction (WTLP), allows continuous control of the  warping factor. Furthermore, a warped version of the DAP method, called WDAP, is introduced. The respective warped methods allow a continuous control of the warping factor, and here we are interested in the perceptual quality of the envelope estimation according to the warping factor for all methods. Results of our listening tests show that the frequency warping which best approximates the Bark scale, does not always give the best results.

Presented at

Full paper

Figures and sounds

Clarinet

 

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

Flute

 

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

Trombone

 

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

Saxophone

 

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

Reference sound

 

 

\lambda = 0

P = 8

\lambda = 0.27

P = 8

\lambda = 0.52

P = 8

\lambda = 0.72

P = 8

\lambda = 0.8

P = 8

\lambda = 0

P = 16

 

 

http://www.acoustics.hut.fi/go/smac2013-warping
Authors: Rémi Mignot, Heidi-Maria Lehtonen, and Vesa Välimäki
Modified:

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