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"""
06-vocoder.py - Analysis/resynthesis vocoder effect.
A vocoder is an analysis/resynthesis process that
uses the spectral envelope of a first sound to shape
the spectrum of a second sound. Usually (for the best
results) the first sound should present a dynamic
spectrum (for both frequencies and amplitudes) and the
second sound should contain a rich and stable spectrum.
In this example, LFOs are applied to every dynamic argument
of the Vocoder object to show the range of sound effects
the user can get with a vocoder.
"""
from pyo import *
from random import random
s = Server().boot()
# First sound - dynamic spectrum.
spktrm = SfPlayer("../snds/baseballmajeur_m.aif", speed=[1, 1.001], loop=True)
# Second sound - rich and stable spectrum.
excite = Noise(0.2)
# LFOs to modulate every parameters of the Vocoder object.
lf1 = Sine(freq=0.1, phase=random()).range(60, 100)
lf2 = Sine(freq=0.11, phase=random()).range(1.05, 1.5)
lf3 = Sine(freq=0.07, phase=random()).range(1, 20)
lf4 = Sine(freq=0.06, phase=random()).range(0.01, 0.99)
voc = Vocoder(spktrm, excite, freq=lf1, spread=lf2, q=lf3, slope=lf4, stages=32).out()
s.gui(locals())
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