simple python script for writing wav files with cos waves
#!/usr/bin/python
import wave, struct, math
def writeSecFreq(wvobj, dur, vol, freq, sampleRate):
for i in range(int(dur * sampleRate)):
value = int(vol*math.cos(freq*math.pi*float(i)/float(sampleRate)))
data = struct.pack('<h', value)
wvobj.writeframesraw( data )
sampleRate = 44100.0 # hertz
duration = 6.0 # seconds
frequency = 440.0 # hertz
wavef = wave.open('sound.wav','w')
wavef.setnchannels(1) # mono
wavef.setsampwidth(2)
wavef.setframerate(sampleRate)
writeSecFreq(wavef, 1, 32400.0, 440.0, sampleRate);
writeSecFreq(wavef, 1, 32400.0, 400.0, sampleRate);
writeSecFreq(wavef, 1, 32400.0, 380.0, sampleRate);
writeSecFreq(wavef, 1, 32400.0, 240.0, sampleRate);
writeSecFreq(wavef, 1, 32400.0, 500.0, sampleRate);
writeSecFreq(wavef, 0.5, 32400.0, 680.0, sampleRate);
writeSecFreq(wavef, 0.5, 32400.0, 480.0, sampleRate);
wavef.writeframes('')
wavef.close()