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Old 06-16-2010, 02:13 PM
Darkmax Darkmax is offline
Join Date: Feb 2010
Posts: 108
Voice recognition

I was just wondering if someone had tried a voice recognition library in vizard, because i would like to make a application where i can control it with my voice.

I found another thread about this but it was a little old and said that the library that was used now doesn't work.

So if some knows an approach to make this, I'm all ears
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Old 06-16-2010, 02:53 PM
farshizzo farshizzo is offline
WorldViz Team Member
Join Date: Mar 2003
Posts: 2,849
You can use the 3rd party pywin32 library along with the Microsoft Speech SDK to perform voice recognition in Python.

1) Download and install the pywin32 library.

2) Download and install the Microsoft Speech SDK.

3) Run the makepy script and select the Microsoft Speech Object Library from the list and click OK. The makepy script should be located in your "[Vizard]\bin\lib\site-packages\win32com\client" folder.

4) You should now be able to run the following sample script which allows you to change the background color by saying the name of the color:
from win32com.client import constants
import win32com.client
import pythoncom

VOICE_COLORS = { "Red" : viz.RED
				,"Green" : viz.GREEN
				,"Blue" : viz.BLUE
				,"Yellow" : viz.YELLOW
				,"White" : viz.WHITE
				,"Black" : viz.BLACK
				,"Purple" : viz.PURPLE
				,"Orange" : viz.ORANGE }

"""Sample code for using the Microsoft Speech SDK 5.1 via COM in Python.
	Requires that the SDK be installed (it's a free download from
	and that MakePy has been used on it (in PythonWin,
	select Tools | COM MakePy Utility | Microsoft Speech Object Library 5.1).

	After running this, then saying "One", "Two", "Three" or "Four" should
	display "You said One" etc on the console. The recognition can be a bit
	shaky at first until you've trained it (via the Speech entry in the Windows
	Control Panel."""
class SpeechRecognition:
	""" Initialize the speech recognition with the passed in list of words """
	def __init__(self, wordsToAdd):
		# For speech recognition - first create a listener
		self.listener = win32com.client.Dispatch("SAPI.SpSharedRecognizer")
		# Then a recognition context
		self.context = self.listener.CreateRecoContext()
		# which has an associated grammar
		self.grammar = self.context.CreateGrammar()
		# Do not allow free word recognition - only command and control
		# recognizing the words in the grammar only
		# Create a new rule for the grammar, that is top level (so it begins
		# a recognition) and dynamic (ie we can change it at runtime)
		self.wordsRule = self.grammar.Rules.Add("wordsRule", constants.SRATopLevel + constants.SRADynamic, 0)
		# Clear the rule (not necessary first time, but if we're changing it
		# dynamically then it's useful)
		# And go through the list of words, adding each to the rule
		[ self.wordsRule.InitialState.AddWordTransition(None, word) for word in wordsToAdd ]
		# Set the wordsRule to be active
		self.grammar.CmdSetRuleState("wordsRule", 1)
		# Commit the changes to the grammar
		# And add an event handler that's called back when recognition occurs
		self.eventHandler = ContextEvents(self.context)

"""The callback class that handles the events raised by the speech object.
	See "Automation | SpSharedRecoContext (Events)" in the MS Speech SDK
	online help for documentation of the other events supported. """
class ContextEvents(win32com.client.getevents("SAPI.SpSharedRecoContext")):
	"""Called when a word/phrase is successfully recognized  -
		ie it is found in a currently open grammar with a sufficiently high
	def OnRecognition(self, StreamNumber, StreamPosition, RecognitionType, Result):
		newResult = win32com.client.Dispatch(Result)
		print "You said: ",newResult.PhraseInfo.GetText()

if __name__=='__main__':

	speechReco = SpeechRecognition(VOICE_COLORS.keys())
	import viz

	import vizact

	speaker = win32com.client.Dispatch("SAPI.SpVoice")
	speaker.Speak('This script shows how to use the Microsoft Speech SDK with Vizard')
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Old 06-16-2010, 04:40 PM
Darkmax Darkmax is offline
Join Date: Feb 2010
Posts: 108
wow thank you, but just a question where it say "wordsRule" in the code, this like a keyword to start recognizing the next word that i will say or what is this?

I tried and it works great, but if i want recognize only when a key word is said?

for example:
if i say "vizard(keyword) green(command)" will turn green the background, but if i just say green will do nothing.
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Old 06-16-2010, 05:03 PM
Darkmax Darkmax is offline
Join Date: Feb 2010
Posts: 108
lol i think i just need to add the keyword before the word, like this:

VOICE_COLORS = { "vizard Red" : viz.RED
				,"vizard Green" : viz.GREEN
				,"vizard Blue" : viz.BLUE
				,"vizard Yellow" : viz.YELLOW
				,"vizard White" : viz.WHITE
				,"vizard Black" : viz.BLACK
				,"vizard Purple" : viz.PURPLE
				,"vizard Orange" : viz.ORANGE }
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