13. The system according to claim 8 , wherein the presentation is selected from the group comprising audio-visual multimedia presentation, audio, video, text and graphics presentation, live speaker presentation, telephone conference, a recording, slides, video close caption, images and computer files.
8. A computer-based system for speech to text conversion preprocessing of a presentation with a speech audio, comprising: means for capturing a presentation speech audio input to be converted into text; a computer programmed to perform the steps of: preprocessing the presentation speech audio input prior to its speech to text conversion by temporally associating the speech audio input with at least one supporting text source from the same presentation containing common keywords; and creating an optimized and prioritized keyword positional index metadata set for inputting into a speech to text conversion processor.