sr.py

#Python 2.x program for Speech Recognition

import speech_recognition as sr

#enter the name of usb microphone that you found
#using lsusb
#the following name is only used as an example
mic_name = "USB Device 0x46d:0x825: Audio (hw:1, 0)"
#Sample rate is how often values are recorded
sample_rate = 48000
#Chunk is like a buffer. It stores 2048 samples (bytes of data)
#here. 
#it is advisable to use powers of 2 such as 1024 or 2048
chunk_size = 2048
#Initialize the recognizer
r = sr.Recognizer()

#generate a list of all audio cards/microphones
mic_list = sr.Microphone.list_microphone_names()

#the following loop aims to set the device ID of the mic that
#we specifically want to use to avoid ambiguity.
for i, microphone_name in enumerate(mic_list):
	if microphone_name == mic_name:
		device_id = i

#use the microphone as source for input. Here, we also specify 
#which device ID to specifically look for incase the microphone 
#is not working, an error will pop up saying "device_id undefined"
with sr.Microphone(device_index = device_id, sample_rate = sample_rate, 
						chunk_size = chunk_size) as source:
	#wait for a second to let the recognizer adjust the 
	#energy threshold based on the surrounding noise level
	r.adjust_for_ambient_noise(source)
	print("Say Something")
	#listens for the user's input
	audio = r.listen(source)
		
	try:
		text = r.recognize_google(audio)
		print("you said: ")+ text
	
	#error occurs when google could not understand what was said
	
	except sr.UnknownValueError:
		print("Google Speech Recognition could not understand audio")
	
	except sr.RequestError as e:
		print("Could not request results from Google Speech Recognition service; {0}".format(e))