I had a pretty graph, I wanted to hear how it sounded.
wavwrite(y, 1000, 16, "test.wav");

Sst Wom Y 1000

Just playing around in 2005 with my piano.  Too bad I don't have more old recordings.

Improv2005

Playing around with the jazz standard "Peace" by Horace Silva.  Performed by me in 2005ish (found in an ancient email).  I think other recordings exist somewhere.

Peace-improv-horace-silva

This is a random noise vector generated via:

import numpy as np
from scipy.io.wavfile import write
# import sys

# Super cool, making audio from the vector
# https://stackoverflow.com/questions/10357992/how-to-generate-audio-from-a-numpy-array

x = np.random.random(10000)
scaled = np.int16(x/np.max(np.abs(x)) * 32767)
write('test.wav', 44100/32, scaled)

Rocket sound

This was done with audacity.  I made a short high pitch trill and reduced the speed by 90%.

Demon Laugh

#generating code, feel free to use
import numpy as np
from scipy.io.wavfile import write
x = np.ones(1000)
f = 5.0
for i in range(x.size):
    if i % 50 == 0:
        f = np.random.uniform(1,20)
    x[i] = np.sin( 200.0 * f * i)
write('random_chirp.wav', 44100/32, x)

Random Computer Chirp

#x is noise via an Ornstein-Uhlenbeck Process
x[i] *= np.sin( 200.0 * f * np.sin(i/1000.0)) * 200

Wind Sweep

import numpy as np
from scipy.io.wavfile import write

L = 5000
x = np.ones(L)

f = 440.0
b = pow(2,1/12.0)
for i in range(x.size):
    if i % 200 == 0:
        f *= b
    x[i] *= np.sin( f * i/1000.0 ) * 200

write('data/out.wav', 44100/32, x)

randompast

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