Controls how loudly callers must speak to interrupt prompts (barge-in) and detect speech.
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Value |
Integer: 1–100. Represents the percentage of sensitivity while the prompt is active. |
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Default |
50 (percent) |
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How to set |
Set in the browser, using the Vendor-Specific-Parameters header in a RECOGNIZE or SET-PARAMS request. 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 when tuning deployed applications and troubleshooting “accidental” barge-in. Most applications never change this parameter, and it is seldom useful during application development because of differences in the quality of audio signal on deployed systems. Applicable for Nuance Recognizer. Not applicable for Dragon Voice recognition. |
When callers speak, the Recognizer and speech detector continuously adapt their acoustic states to the current speech volume (as well as telephone line conditions).
To avoid accidental barge-in, most applications want callers to speak slightly more loudly while prompts are playing than when speaking after the prompt completes. This parameter temporarily decreases sensitivity while the prompt is playing (forcing caller to speak louder). When the prompt is finished, the Recognizer re-adjusts the sensitivity to the needed amplitude.
- Barge-in must be enabled for this setting to have any effect.
- Make small adjustments, evaluate the result, and refine the value. The goal is to balance the frequency of “accidental” barge-ins with the inconvenience of speaking louder.
- A higher value increases the chance of accidental barge-ins but allows the caller to barge-in with softer speech.
- A lower value reduces the chance of accidental barge-in, but requires louder speech to barge in.
Browsers usually set this parameter in a RECOGNIZE request, and the parameter automatically reverts to the previous value after the recognition event. (Alternatively, browsers can use the SET-PARAMS method. See Configuring Recognizer with the browser.)
Vendor-Specific-Parameters: swiep_in_prompt_sensitivity_percent=40
Related parameters
