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Re: Modifying speech signal
We use Kawahara-san's vocoder STRAIGHT. It works very well on clean
speech recordings. We describe its use in several papers where we scaled
speech sounds over a wide range.
Smith, D. R. R., Patterson, R. D., Turner, R., Kawahara, H., and Irino,
T. (2005). "The processing and perception of size information in speech
sounds," J. Acoust. Soc. Am. 117, 305-318.
Ives, D. T., Smith, D. R. R. and Patterson, R. D. (2005).
"Discrimination of speaker size from syllable phrases," J. Acoust. Soc.
Am. 118 (6), 3816-3822.
Smith, D. R. R. and Patterson, R. D. (2005). "The interaction of
glottal-pulse rate and vocal-tract length in judgements of speaker size,
sex and age," J. Acoust. Soc. Am. 118, 3177-3186.
It also works on some musical instruments by the way.
Dinther, R. van, Patterson, R. D. (2006). “Perception of acoustic scale
and size in musical instrument sounds,” J. Acoust. Soc. Am. 120, 2158-2176.
You can also use PRAAT from Peter Boersema in Amsterdam.
Another useful application is PSOLA from Eindhoven.
Regards Roy Patterson
David Schwartz wrote:
For a study of formant perception, I'm seeking a method to transform
normal speech signals so as to alter the apparent vocal tract length of
the speaker. Any and all suggestions much appreciated.
Department of Psychology
email: schwartz /at /neuro /dot /duke /dot /edu
The early bird may get the worm, but the second mouse gets the cheese.
Roy and Karalyn Patterson
17 Woodlands Road
Great Shelford, Cambridge, CB22 5LW
Phone +44 1223 842310 (International format)