Provides access to DTMF recognition services.
Inheritance Hierarchy
Namespace:
Microsoft.Speech.Recognition
Assembly:
Microsoft.Speech (in Microsoft.Speech.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Class DtmfRecognitionEngine _ Implements IDisposable |
| Visual Basic (Usage) |
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Dim instance As DtmfRecognitionEngine |
| C# |
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public class DtmfRecognitionEngine : IDisposable |
Remarks
Dual-Tone Multi-Frequency (DTMF) tones are generated by pressing the keys on a telephone. The DtmfRecognitionEngine class supports the use of speech recognition grammars to analyze DTMF input emitted by telephones. The members of DtmfRecognitionEngine are similar to those of the SpeechRecognitionEngine class. However, the input for recognition consists of a series of DTMF tones instead of an audio stream.
The DtmfRecognitionEngine works by performing a series of emulated recognitions. It maintains a buffer with a list of tones that have been received. Every time a new tone is received, it appends the new tone to the list and emulates recognition of the whole list. This process continues until emulation produces a definitive result, or one of the timeouts is reached.
Thread Safety
See Also
