The Recognizers tab provides a user interface to recognizer components that have been installed as extensions. These recognizer components generally apply pattern recognition algorithms to automatically detect events of interest (pauses, speaker turns, utterances, gesture phases etc.) in an audio or a video file. Each recognizer has it's own icon representing the kind of recognizer.

A few recognizers are included in the ELAN distribution, one of them, the Silence Recognizer, is described in more detail here (seethe section called “Creating a tier using the Silence Recognizer”). The screenshot below shows an example of the list of installed recognizers.

Figure 94. The Recognizer Tab

The latest interface specification for audio and video recognizers is available in this document: Avatech-interface-spec-2014-03-06.pdf. The old AVATecH and AUVIS project pages are no longer online. The recognizers developed in those projects are likewise not available as web services anymore and their extensions have been removed from the recognizer tab.