vocabulary
A set of words used in a grammar. A speech-recognition engine typically supports several different sizes of vocabulary, which determine the words that the engine can recognize in a given state.
voice command
A word or phrase associated with a voice menu. When an engine recognizes a voice command, it notifies the application that owns the voice menu containing the command.
voice-command site
A speech-recognition mode and audio source that together serve as a source of voice-command input.
voice menu
A list of voice commands to which an application can respond. A voice menu must be active before an engine can recognize its commands.
voice-text site
A text-to-speech mode and an audio destination that together serve as a destination for voice-text output.
VU (Volume Units) Meter
An indicator that displays the volume of sound being received by the microphone or through the line-in port. Optimum reception is achieved when the meter registers in the middle area.