Spectral Envelope Estimation and Representation for
Sound Analysis-Synthesis
Diemo Schwarz (schwarz@ircam.fr) · Xavier Rodet (rod@ircam.fr)
Abstract
Properties of Spectral Envelopes
Estimation
Requirements
The properties of spectral envelopes must be satisfied, plus the requirement of:
Methods
Comparison
Representation
A unified high-level representation for use in musical synthesis should fulfill the requirements:
Proposed Representations
Comparison of Representations
Scores (++, +, o, -, --) indicating fulfillment of requirements.
Represen- |
Stability |
Locality |
Flexibility / Ease of Manipulation |
Speed of Synthesis TD/FD |
Space |
Manual Input |
Filter Coef. |
++ |
- |
-- /- |
++ / o |
+ |
-- |
Sampled |
++ |
++ |
++ / + |
- / ++ |
o |
+ |
Geometric |
- |
+ |
+ / ++ |
- / + |
+ |
++ |
Formants |
- |
+ |
++ / ++ |
+ / o |
++ |
++ |
Synthesis
In synthesis from scratch, a spectral envelope is given directly as part of the synthesis parameters.
In resynthesis, an input signal is modified so as to respect the desired spectral envelope.
Methods
Applications
Application to the Singing Voice
Conclusion
-> use and combine all of them in an object-oriented class hierarchy.
Bibliography
[1] Y. Stylianou, J. Laroche, E. Moulines. High Quality Speech Modification based on a Harmonic+Noise Model. Proc. EUROSPEECH, 1995.
[2] Marine Campedel-Oudot. Étude du modèle sinusoides et bruit pour le traitement de la parole. Estimation robuste de l'enveloppe spectrale. Thèse, ENST, Paris, 1998.
[3] A. Freed, X. Rodet, Ph. Depalle. Synthesis and Control of Hundreds of Sinusoidal Partials on a Desktop Computer without Custom Hardware. ICSPAT, 1992.
[4] Diemo Schwarz. Spectral Envelopes in Sound Analysis and Synthesis. Diplomarbeit, Universität Stuttgart, Fakultät Informatik, Germany, 1998.
[5] F. Déchelle, M. DeCecco, E. Maggi, N. Schnell. jMax Recent Developments. Proc. ICMC, 1999.
[6] Dominique Virolle, Diemo Schwarz. Xavier Rodet. Sound Description Interchange Format. Web page. http://www.ircam.fr/sdif
[7] M. Wright, A. Chaudhary, A. Freed, S. Khoury, D. Wessel. Audio Applications of the Sound Description Interchange Format Standard. AES 107th convention, 1999.