The following are some sound examples which make use of some of the theory
developed in Music 421 / EE 367B. The first group of sound examples are by
Mark Dolson. For more information, look at his excellent tutorial on phase
vocoders (in the Reader).
The second group of sound examples are by Celso Aguiar . Celso
made these using Xavier Serra's Spectral Modeling Synthesis (SMS)
software. Basically, this technique assumes a signal model based on a
sinusoidal (deterministic)+ noise (stochastic) representation. The
Short Time Fourier Transform is used for analysis purposes to extract
and track the major sinusoidal peaks. For these sounds, the analysis
was carried out with Xavier's programs. The resynthesis uses Celso's
own programs combining Xavier Rodet's IFFT algorithm for additive
synthesis in CLM-C-Lisp's compositional environment. In SMS, the
Stochastic representation is modeled by performing a spectral fitting
on the residual signal. For these sounds, the residual itself was
employed, phase-vocodered whenever necessary.
This signal representation is very flexible. It allows for time and frequency modifications to be made to the signal. Additionally it can be used for `morphing' of sounds.
The third group of sounds were realized by Juan Pampin. They are the
results of cross synthesis of singing voice and several sounds of
nature (water, wind and fire)
Vocal sound "ah" (singing @ a#2)
Water: drain, s-river, swash
Variable filter BW:
Constant filter BW (vocal partials were shifted by 3/8 to 8/8 of f0)
These sounds are part of a collaboration of Juan Pampin with professor
Levine's thesis home page for some sound examples of "sines +
noise + transients" modeling, including time compression-expansion and
frequency-shifting examples in the compressed domain.
Back to the Music 421 class homepage.