How do I access recognition result confidence?

Last reviewed: 7/15/2011

HOW Article ID: H071130

The information in this article applies to:

  • SpeechKit 7

Summary

Speech recognizer confidence values are available on ChantWord, ChantPhraseProperty, and ChantRule objects that can be enumerated on recognition results.

More Information

Confidence values as well as other recognition event values are displayed in the Chant Developer Workbench event log when testing contexts or grammars.

Refer to the Class object definitions in the Class Library Reference to determine which APIs set these values and see the API documentation for additional information about their meaning.

The ChantWord object has the following confidence values:

APIsNameDescription
Nuance VoCon 3200ConfidenceThe confidence value of this alternative.
Microsoft SAPI 5 Speech RecognitionConfidenceActualActual confidence for this word.
Microsoft SAPI 5 Speech RecognitionConfidenceEngineConfidence value computed by the recognizer.
Microsoft SAPI 5 Speech RecognitionConfidenceRequiredRequired confidence for this word.
IBM SMAPINuance VoCon 3200ScoreMeasure of word probability.

The ChantPhraseProperty object has the following confidence values:

APIsNameDescription
Microsoft SAPI 5 Speech RecognitionConfidenceActualActual confidence for this phrase.
Microsoft SAPI 5 Speech RecognitionConfidenceEngineConfidence value computed by the recognizer.

The ChantRule object has the following confidence values:

APIsNameDescription
Microsoft SAPI 5 Speech RecognitionConfidenceActualActual confidence for this phrase.
Microsoft SAPI 5 Speech RecognitionConfidenceEngineConfidence value computed by the recognizer.