augment_pitch.py

'''
              AAA               lllllll lllllll   iiii                      
              A:::A              l:::::l l:::::l  i::::i                     
             A:::::A             l:::::l l:::::l   iiii                      
            A:::::::A            l:::::l l:::::l                             
           A:::::::::A            l::::l  l::::l iiiiiii     eeeeeeeeeeee    
          A:::::A:::::A           l::::l  l::::l i:::::i   ee::::::::::::ee  
         A:::::A A:::::A          l::::l  l::::l  i::::i  e::::::eeeee:::::ee
        A:::::A   A:::::A         l::::l  l::::l  i::::i e::::::e     e:::::e
       A:::::A     A:::::A        l::::l  l::::l  i::::i e:::::::eeeee::::::e
      A:::::AAAAAAAAA:::::A       l::::l  l::::l  i::::i e:::::::::::::::::e 
     A:::::::::::::::::::::A      l::::l  l::::l  i::::i e::::::eeeeeeeeeee  
    A:::::AAAAAAAAAAAAA:::::A     l::::l  l::::l  i::::i e:::::::e           
   A:::::A             A:::::A   l::::::ll::::::li::::::ie::::::::e          
  A:::::A               A:::::A  l::::::ll::::::li::::::i e::::::::eeeeeeee  
 A:::::A                 A:::::A l::::::ll::::::li::::::i  ee:::::::::::::e  
AAAAAAA                   AAAAAAAlllllllllllllllliiiiiiii    eeeeeeeeeeeeee  

 / _ \                                 | |      | | (_)            
/ /_\ \_   _  __ _ _ __ ___   ___ _ __ | |_ __ _| |_ _  ___  _ __  
|  _  | | | |/ _` | '_ ` _ \ / _ \ '_ \| __/ _` | __| |/ _ \| '_ \ 
| | | | |_| | (_| | | | | | |  __/ | | | || (_| | |_| | (_) | | | |
\_| |_/\__,_|\__, |_| |_| |_|\___|_| |_|\__\__,_|\__|_|\___/|_| |_|
        __/ |                                                
       |___/                                                 
  ___  ______ _____        ___            _ _       
 / _ \ | ___ \_   _|  _   / _ \          | (_)      
/ /_\ \| |_/ / | |   (_) / /_\ \_   _  __| |_  ___  
|  _  ||  __/  | |       |  _  | | | |/ _` | |/ _ \ 
| | | || |    _| |_   _  | | | | |_| | (_| | | (_) |
\_| |_/\_|    \___/  (_) \_| |_/\__,_|\__,_|_|\___/   


Takes in an audio file and outputs files normalized to 
different pitches. This corrects for gender ane time-of-day differences.

Where gives the pitch shift as positive or negative ‘cents’ 
(i.e. 100ths of a semitone). There are 12 semitones to an octave, 
so that would mean ±1200 as a parameter.
'''
import os, random

def augment_pitch(filename):
  basefile=filename[0:-4]
  randint=random.randint(300,600)
  os.system('sox %s %s pitch %s'%(filename, basefile+'_freq_1.wav', str(randint)))
  randint=random.randint(300,600)
  os.system('sox %s %s pitch -%s'%(filename, , str(randint)))
  return [filename, basefile+'_freq_1.wav',basefile+'_freq_2.wav']