1.2.2 Voice Activity Detector (VAD)

When a caller begins to speak over a prompt (also known as barge-in), the application typically stops the playing of the prompt so that it isn't distracting to the caller.

A voice activity detector (VAD) is a component in the CSP software that examines the caller's incoming signal and determines if the signal contains significant energy and is likely to be speech rather than a click, for example. The significance is determined by configurable parameters.

The VAD has several configurable parameters such as the threshold of energy that is considered significant during prompt play and after the prompt has completed play. For more information, see parameter descriptions in ec_setparm( ) in the Continuous Speech Processing API Library Reference.

For information on the VAD, see Chapter 5, Using the Voice Activity Detector. For information on choices of operating modes for the VAD, see Section5.1, Voice Activity Detector Operating Modes.

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