c# - Audio device error encountered. - Error Code: 0x4 -


i'm working on speech recognition program on c# (using visual basic 2013), , when compile , try out, works fine first command gives me weird exception when speak second command. details:

a first chance exception of type 'system.speech.internal.synthesis.audioexception' occurred in system.speech.dll

an exception of type 'system.speech.internal.synthesis.audioexception' occurred in system.speech.dll not handled in user code

additional information: audio device error encountered. - error code: 0x4

my code quite few lines long, here's first , possibly related part:

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; using system.speech.recognition; using system.speech.synthesis; using system.io; using system.xml; using system.web;  namespace jarvistest { public partial class form1 : form {     speechrecognitionengine _recognizer = new speechrecognitionengine();     speechsynthesizer jarvis = new speechsynthesizer();     string qevent;     string procwindow;     double timer = 10;     int count = 1;     random rnd = new random();      string temperature;     string condition;     string humidity;     string windspeed;     string town;     string tfcond;     string tfhigh;     string tflow;     string stuff;       public form1()     {         initializecomponent();     }      private void form1_load(object sender, eventargs e)     {         _recognizer.setinputtodefaultaudiodevice();         _recognizer.loadgrammar(new dictationgrammar());         _recognizer.loadgrammar(new grammar(new grammarbuilder(new choices(file.readalllines(@"c:\users\aristotelis\documents\jarvistest.txt")))));         _recognizer.speechrecognized += new eventhandler<speechrecognizedeventargs>(_recognizer_speechrecognized);         _recognizer.recognizeasync(recognizemode.multiple);     }       void _recognizer_speechrecognized(object sender, speechrecognizedeventargs e)     {         int rannum = rnd.next(1, 10);          string speech = e.result.text;         switch (speech)         {             //wolfram             case "ram":                                wolframalpha();                 jarvis.speak("time stuff" + stuff);                 break;              //weather              case "hows weather":                 getweather();                 jarvis.speak("the temperature in " + town + " " + temperature + " degrees.");                 break;              //greetings             case "hello":             case "hello jarvis":                 if (rannum < 6) { jarvis.speak("hello sir"); }                 else if (rannum > 5) { jarvis.speak("hi"); }                 break;

i'm not sure causes problem. highly appreciated, in advance.

stack tracing shows:

expression: ((system.speech.internal.synthesis.audioexception)$exception).stacktrace value: @ system.speech.internal.synthesis.voicesynthesis.speak(prompt prompt) @ system.speech.synthesis.speechsynthesizer.speak(prompt prompt) @ system.speech.synthesis.speechsynthesizer.speak(string texttospeak) @ jarvistest.form1._recognizer_speechrecognized(object sender, speechrecognizedeventargs e) in c:\users\aristotelis\documents\visual studio 2012\projects\jarvistest\jarvistest\form1.cs:line 77 @ system.speech.recognition.speechrecognitionengine.speechrecognizedproxy(object sender, speechrecognizedeventargs e)

this type of error occurs when speech device damaged. have seen http://social.msdn.microsoft.com/forums/vstudio/en-us/9075023b-8bc4-4632-a573-77470b403a48/i-get-an-audioexception-0x2 ???


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