Voice Recognition In .NET With SAPI 5.1?

Apr 7, 2012

I want to incorporate Voice Recognition in my program using SAPI 5.1. So I looked for a tutorial and found this:[URL]..I downloaded the SDK and I can't seem to find a .dll file to include in my program for the SpeechLib. Am I missing something?


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I am using system.speech currently. I want to use speech recognition to make a program. However, while the program is running, I noticed that some of the commands for windows (like saying "run") would trigger other program functions. Thus, while the VB.net program is running I do not want this to happen. Also, when the computer starts up, I speech to start listening right away rather than me having to say "start listening". How can I do this? I am pretty sure that it is simple. This is my code so far:


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Public Class Form1
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I'm using Visual studio 2008 and microsoft sapi in a forms application. I am using text to speech which works just fine however when the computer is speaking it "bricks" the application and the main ui is unresponsive until the computer is done talking then everything returns to normal.  To counter this issue I tried using the background worker thread to establish the sapi on another thread however the form is still freezing when the computer speaks. I would like to note that at this point there is nothing on the form except a tabbed window and a few buttons the form is not performing any code what so ever other then the text to speech. 

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I'm just trying to get this example code to work in Visual Basic 2010 Express.

I am half way there, it actually speaks, but there is no output of the visemes.

Here's the code example I am working from :[URL].. And below here is my actual code, which had to be modified a little.


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The problem I'm having is that while the "whatever" is actually being spoken, the program doesn't seem to respond to input.  The input does show up once the audio is through, but I really need to be able to detect some input (say, a mouse or button click) during a message and respond immediately, perhaps even stopping the audio.

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Here is the code:

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I have made several DLL for future projects and wish to change the icon for better recognition

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what I gather, the biggest difference between the old SAPI 5.1 and SAPI 5.3 is that SAPI 5.3 actually takes less code to do some of the same things that SAPI 5.1 does. This is just a simple example that runs notepad and says it is before doing so.One thing to remember is that the name of speech lib is changed again. Now you have to do this: Project -> Add Reference -> .NET -> System.Speech

imports system.speech
Public Class Form1
Public WithEvents recognizer As New System.Speech.Recognition.SpeechRecognitionEngine
Dim gram As New System.Speech.Recognition.DictationGrammar()


gram is a DictationGrammar object. As it turns out, there are two grammar objects in SAPI 5.3. As you've probably already guessed, DictationGrammar is for spoken language and the normal grammar object is for simple grammar rules.

So basically, Load the grammar, set audio to the default input device and then start an Async recognize call. They have a blocking recognize call and one thing to note here is that it will turn itself off after each sucessful recognized phrase. Meaning that you have to recall Async recognize at the end of the GotSpeech sub if you want to keep picking up voice commands. As it stands, this will pick up one command and no more because it stops recognition.

One neat thing about the synthesis engine is that you can specify things like ".NET" to be said as "dot net" by Anna. Also, as it stands, the periods aren't said and so are pretty much useless. It acts just like the Vista Recognition engine also so if you spell out a word, Anna will spell it out too.In this example there is an undeclared variable named "cmd" that I fail to understand. What is the role of it and where does it obtain it's value from. I actually assume it should be the one to get the decoded\recognized text from the recognizer but not sure how that is achieved.

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I'm making an application that requires me to perform speech recognition from a wave file that contains some speech. I know what the words in the wave file could be.So, I need to compare these words from a small custom grammar/dictionalr instead of a whole built in large vocabulary.

I have done the recognition part with the default system large vocabulary but now just need to use my own vocabulary.

Suppose that the words that the user can say are:

hundred degree celcius,

Then, how shall I write my XML Grammar? I suppose that if I use the limited small vocabulary, then my accuracy of recognition would increase. Right now, ive a wave file in Microsoft Mary's voice saying "Hello". But with the large default vocabulary its recognising it as "All though". Is my assumption correct that with the above mentioned 5 words in the vocabulry, it will recognise it as Hello only?

Ive been looking at the internet but can't find solution to my specific problem regarding making a simple grammar. In most documents its mentioning using external grammar and about several of the attributes posssible, including sementics, etc, etc. But my vocabulary is not very complicated or difficult. And I don't want to get into too much detail at the moment as I would be deviating from my project itself..

So using the following code:

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What should be the content of the CustomGrammar.xml?

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