audio-utils/damped_blender.py

#!/usr/bin/env python
from wavebender import *
from itertools import *

def ncycles(iterable, n):
    "Returns the sequence elements n times"
    return chain.from_iterable(repeat(tuple(iterable), n))

def waves():
    l = int(44100*0.4) # each note lasts 0.4 seconds
    
    return cycle(chain(ncycles(chain(islice(damped_wave(frequency=440.0, amplitude=0.1, length=int(l/4)), l),
                                     islice(damped_wave(frequency=261.63, amplitude=0.1, length=int(l/4)), l),
                                     islice(damped_wave(frequency=329.63, amplitude=0.1, length=int(l/4)), l)), 3),
                       islice(damped_wave(frequency=440.0, amplitude=0.1, length=3*l), 3*l),
                 
                       ncycles(chain(islice(damped_wave(frequency=293.66, amplitude=0.1, length=int(l/4)), l),
                                     islice(damped_wave(frequency=261.63, amplitude=0.1, length=int(l/4)), l),
                                     islice(damped_wave(frequency=293.66, amplitude=0.1, length=int(l/4)), l)), 2),
                       chain(islice(damped_wave(frequency=293.66, amplitude=0.1, length=int(l/4)), l),
                             islice(damped_wave(frequency=329.63, amplitude=0.1, length=int(l/4)), l),
                             islice(damped_wave(frequency=293.66, amplitude=0.1, length=int(l/4)), l)),
                       islice(damped_wave(frequency=261.63, amplitude=0.1, length=3*l), 3*l)))

channels = ((waves(),), (waves(), white_noise(amplitude=0.001),))

samples = compute_samples(channels, None)
write_wavefile(stdout, samples, None)