loops - Python Voice Recognition Library - Always Listen?

Question

I've recently been working on using a speech recognition library in python in order to launch applications. I Intend to ultimately use the library for voice activated home automation using the Raspberry Pi GPIO.

I have this working, it detects my voice and launches application. The problem is that it seems to hang on the one word I say (for example, I say internet and it launches chrome an infinite number of times)

This is unusual behavior from what I have seen of while loops. I cant figure out how to stop it looping. Do I need to do something out of the loop to make it work properly? Please see the code below.

http://pastebin.com/auquf1bR

import pyaudio,os
import speech_recognition as sr
r = sr.Recognizer()
with sr.Microphone() as source:
        audio = r.listen(source)

def excel():
        os.system("start excel.exe")

def internet():
        os.system("start chrome.exe")

def media():
        os.system("start wmplayer.exe")

def mainfunction():
        user = r.recognize(audio)
        print(user)
        if user == "Excel":
                excel()
        elif user == "Internet":
                internet()
        elif user == "music":
                media()
while 1:
        mainfunction()

Answer 1

Just in case, here is the example on how to listen continuously for keyword in pocketsphinx, this is going to be way easier than to send audio to google continuously. And you could have way more flexible solution.

import sys, os, pyaudio
from pocketsphinx import *

modeldir = "/usr/local/share/pocketsphinx/model"
# Create a decoder with certain model
config = Decoder.default_config()
config.set_string('-hmm', os.path.join(modeldir, 'hmm/en_US/hub4wsj_sc_8k'))
config.set_string('-dict', os.path.join(modeldir, 'lm/en_US/cmu07a.dic'))
config.set_string('-keyphrase', 'oh mighty computer')
config.set_float('-kws_threshold', 1e-40)

decoder = Decoder(config)
decoder.start_utt('spotting')

stream = p.open(format=pyaudio.paInt16, channels=1, rate=16000, input=True, frames_per_buffer=1024)
stream.start_stream()        

while True:
    buf = stream.read(1024)
    decoder.process_raw(buf, False, False)
    if decoder.hyp() != None and decoder.hyp().hypstr == 'oh mighty computer':
        print "Detected keyword, restarting search"
        decoder.end_utt()
        decoder.start_utt('spotting')