Patent Document ID: 8494854
Application ID: 12484800

Base Claim:
1. A method of identifying a source of data input to a computing system comprising: a) receiving speech utterance from an entity related to randomly selected challenge text; wherein said challenge text represents a selected set of one more contiguous words which when articulated have a measurable difference in acoustical characteristics between a reference human voice and a reference computer synthesized voice that exceeds a target threshold; further wherein said challenge text is also selected in part based on a confirmation from a human listener that an articulation of such challenge text by a computer synthesized voice is distinguishable from an articulation of such challenge text by a human voice; b) processing said speech utterance with said computing system to compute first acoustical characteristics of said entity; and c) generating a determination of whether said speech utterance originated from a machine or a human.

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Claim 10:
10. The method of claim 1 wherein said first test text data consists of a sentence presented in visual form for the entity to articulate.