Sensitivity of the speech detector when looking for speech.
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Value |
Float: 0.0–1.0. |
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Default |
0.5 |
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How to set |
Shown in precedence order (see Rules of parameter precedence): In a VoiceXML application, using a <property> element. In the browser, using the Sensitivity-Level header in a RECOGNIZE or SET-PARAMS method. In a parameter grammar. In Management Station set on the Nuance recognition service. If not using Management Station, set in a Recognizer configuration file (User-nrsxx.xml). |
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Usage |
Occasionally used for tuning when collected audio has amplitudes that are higher or lower than expected. |
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Performance |
Higher values (more sensitive) quieter speech, but risk false detection of background noise as speech. Lower values (less sensitive) tend to avoid accidently confusing background noise as speech, but may require some callers to speak more loudly. |
Some telephony hardware tends to produce sound packets with reduced amplitudes. This has the same effect as people who speak too quietly to trigger speech detection. This parameter can be used for this situation. Values approaching 1 improve detection (with an increased risk of detection caused by background noise).
A typical application sets this parameter via a VoiceXML property:
<property name="sensitivity" value=".6"/>
Related parameters:
