Patent ID: 7571093

Claim:
A method of identifying duplicate voice recording, comprising the steps of: a) receiving a plurality of digital voice recordings; b) selecting one of said plurality of digital voice recordings; c) segmenting the selected digital voice recording; d) extracting a pitch value from each segment; e) estimating a total time that voice appears in the selected digital voice recording; f) removing pitch values that are less than and equal to a user-definable value; g) identifying unique pitch values in the result of step (f); h) determining the frequency of occurrence of the unique pitch values; i) normalizing the result of step (h) so that the frequencies of occurrence are greater than zero and less than one; j) determining an average pitch value from the pitch values remaining after step (f); k) determining the distribution percentiles of the result of step (h); l) if additional digital voice recordings are to be processed then returning to step (b), otherwise proceeding to the next step; m) comparing the results of steps (e), (j), and (k) for each digital voice recording processed; and n) declaring the digital voice recordings duplicates that compared to within a user-definable threshold for each of the results of steps (e), (j), and (k).