Audio demonstrations

audio files:

• test sentences: This directory contains the 64 stimuli that were used in the perceptual test. The file names are of the form who_X2Y_method.wav

 
• who is "cyn" for the female speaker and "mwm" for the male speaker
• X and Y are one of @,A,i or u. These correspond with the vowels in bat, bought, beat and boot.

X2Y means that the vowel X was spectrallly modified to Y.
• method is "res" for the residual excited LPC method, and "sinsys" for the sinusoidal + all-pole method.

 
• residual excited LPC example (cfr. Figure 1 in the paper):  In chronological order:

 
• original version of /i/ [wav]
• residual of /i/ [wav]
• transformation of /i/ to /ae/ using residual excited LPC [wav]
• original version of /ae/ [wav].

 
• coding examples:  3 versions of the same sentence

 
• original recording [wav]
• sinusoidally coded, where the complex sinusoidal amplitudes a_k are replaced by the complex values of the all-pole spectrum evaluated at the harmonic frequencies [wav]
• sinusoidally coded, but angle(a_k) is preserved below 300 Hz and above 4000 Hz [wav]