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change a sound's loudness

# Three functions that change the volume of a sound.


# Make a sound quieter
def decreaseVolume(sound):
   for sample in getSamples(sound):
      value = getSample(sample)
      setSample(sample, value *0.5)

# Make a sound quieter
# Be careful! This can lead to clipping.
def increaseVolume(sound):
  for sample in getSamples(sound):
    value = getSample(sample)
    setSample(sample, value* 2)









# Adjust loudness of sound by maximimzing it without clipping.
def normalize(sound):

 # 1. Find loudest sample
  largest = 0
  for s in getSamples(sound):        
    largest = max(largest, getSample(s) )    
  print "Largest sample value in original sound was",  largest 

 # 2. Compute amplification factor
  amplification = 32767.0 / largest
  print ”Amplification multiplier is", amplification   

  # 3. Multiply each sample's value by that amount
  for s in getSamples(sound):      
    louder =  amplification  getSample(s)  
    setSample(s, louder)  

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• Slides and Code- Spring 2008 last edited on 23 April 2008 at 11:00 am by lawn-128-61-23-153.lawn.gatech.edu