RecognizedAudio.GetRange(TimeSpan, TimeSpan) 方法
定义
重要
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选择并返回当前已识别音频为二进制数据的部分。
public:
System::Speech::Recognition::RecognizedAudio ^ GetRange(TimeSpan audioPosition, TimeSpan duration);public System.Speech.Recognition.RecognizedAudio GetRange (TimeSpan audioPosition, TimeSpan duration);member this.GetRange : TimeSpan * TimeSpan -> System.Speech.Recognition.RecognizedAudioPublic Function GetRange (audioPosition As TimeSpan, duration As TimeSpan) As RecognizedAudio参数
- audioPosition
- TimeSpan
将返回的起点音频数据。
- duration
- TimeSpan
要返回的段的长度。
返回
返回可识别的音频的小节，如 audioPosition 和 duration 所定义。
例外
audioPosition 和 duration 在当前段范围之外定义音频段。
识别出当前的音频不包含任何数据。
示例
以下示例为名称输入创建语音识别语法，为 SpeechRecognized 事件添加处理程序，并将语法加载到进程内语音识别器中。 然后，它将输入的名称部分的音频信息写入音频文件。 音频文件用作 对象的输入 SpeechSynthesizer ，该对象说出包含录制音频的短语。
private static void AddNameGrammar(SpeechRecognitionEngine recognizer)
{
GrammarBuilder builder = new GrammarBuilder();
builder.Append("My name is");
builder.AppendWildcard();
Grammar nameGrammar = new Grammar(builder);
nameGrammar.Name = "Name Grammar";
nameGrammar.SpeechRecognized +=
new EventHandler<SpeechRecognizedEventArgs>(
NameSpeechRecognized);
recognizer.LoadGrammar(nameGrammar);
}
// Handle the SpeechRecognized event of the name grammar.
private static void NameSpeechRecognized(
object sender, SpeechRecognizedEventArgs e)
{
Console.WriteLine("Grammar ({0}) recognized speech: {1}",
e.Result.Grammar.Name, e.Result.Text);
try
{
// The name phrase starts after the first three words.
if (e.Result.Words.Count < 4)
{
// Add code to check for an alternate that contains the wildcard.
return;
}
RecognizedAudio audio = e.Result.Audio;
TimeSpan start = e.Result.Words[3].AudioPosition;
TimeSpan duration = audio.Duration - start;
// Add code to verify and persist the audio.
string path = @"C:\temp\nameAudio.wav";
using (Stream outputStream = new FileStream(path, FileMode.Create))
{
RecognizedAudio nameAudio = audio.GetRange(start, duration);
nameAudio.WriteToWaveStream(outputStream);
outputStream.Close();
}
Thread testThread =
new Thread(new ParameterizedThreadStart(TestAudio));
testThread.Start(path);
}
catch (Exception ex)
{
Console.WriteLine("Exception thrown while processing audio:");
Console.WriteLine(ex.ToString());
}
}
// Use the speech synthesizer to play back the .wav file
// that was created in the SpeechRecognized event handler.
private static void TestAudio(object item)
{
string path = item as string;
if (path != null && File.Exists(path))
{
SpeechSynthesizer synthesizer = new SpeechSynthesizer();
PromptBuilder builder = new PromptBuilder();
builder.AppendText("Hello");
builder.AppendAudio(path);
synthesizer.Speak(builder);
}
}
