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RecognizedPhrase Class

Represents detailed information about a candidate phrase found by a recognition engine as matching audio input.

Namespace: Microsoft.Speech.Recognition
Assembly: Microsoft.Speech (in microsoft.speech.dll)

public class RecognizedPhrase
/** @attribute SerializableAttribute() */ 
/** @attribute DebuggerDisplayAttribute("{Text}") */ 
public class RecognizedPhrase
public class RecognizedPhrase

Instances of RecognizedPhrase allow applications to obtain:

The RecognitionResult object -- which returns recognition engine matches for audio input as detailed information about the best candidate phrases matching phrase, and a list of all candidate matching phrases -- inherits from RecognizedPhrase. Access to the RecognizedPhrase based information about the best matching candidate phrase returned by a recognition engine operations is typically obtained by using the RecognitionResult members inherited from RecognizedPhrase.


The example below show a display function which provides information about a recognized phrase from an instance of RecognizedPhrase to a user interface, (as well as some information about the recognizer state).

In fact care is taken to check if the result argument provided is in fact a RecognitionResult object, which inherits from RecognizedPhrase; if that is the case the addition information on the RecognitionResult object is displayed.

internal static void DisplayBasicPhraseInfo(Label label, RecognizedPhrase result, SpeechRecognizer recognizer) {
    if (result != null && label != null) {// Blank
        if (recognizer != null) { //Clear
            label.Text += String.Format(
                    "  Recognizer currently at:   {0} mSec\n" +
                    "  Audio Device currently at: {1} mSec\n",

        if (result != null) { //Clear
            RecognitionResult recResult = result as RecognitionResult;
            if (recResult != null) {
                RecognizedAudio resultRecognizedAudio = recResult.Audio;
                if (resultRecognizedAudio == null) {
                    label.Text += String.Format(
                        "  Emulated input\n");
                } else {
                    label.Text += String.Format(
                    "  Candidate Phrase at:       {0} mSec\n" +
                    "  Phrase Length:             {1} mSec\n" +
                    "  Input State Time:          {2}\n" +
                    "  Input Format:              {3}\n",

            label.Text += String.Format("  Confidence Level:          {0}\n", result.Confidence);
            if (result.Grammar != null) {
                label.Text += String.Format(
                                  "  Recognizing Grammar:       {0}\n" +
                                  "  Recognizing Rule:          {1}\n",
                                   ((result.Grammar.Name != null) ? (result.Grammar.Name) : "None"),
                                    ((result.Grammar.RuleName != null) ? (result.Grammar.RuleName) : "None"));

            if (result.ReplacementWordUnits.Count != 0) {
                label.Text += String.Format("  Replacement text:\n");
                foreach (ReplacementText rep in result.ReplacementWordUnits) {
                    label.Text += String.Format("      At index {0} for {1} words. Text: {2}\n",
                        rep.FirstWordIndex, rep.CountOfWords, rep.Text);



All public static (Shared in Visual Basic) members of this type are thread-safe. Instance members are not guaranteed to be thread-safe.

Development Platforms

Windows XP Professional with Service Pack 2 (SP2), Windows Server 2003, Windows Vista Ultimate Edition, Windows Vista Business Edition, Windows Vista Enterprise Edition

Target Platforms

© 2015 Microsoft