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Method of identifying duplicate voice recording

Patent image
NSA

A method of identifying duplicate voice recording by receiving digital voice recordings, selecting one of the recordings; segmenting the selected recording, extracting a pitch value per segment, estimating a total time that voice appears in the recording, removing pitch values that are less than and equal to a user-definable value, identifying unique pitch values, determining the frequency of occurrence of the unique pitch values, normalizing the frequencies of occurrence, determining an average pitch value, determining the distribution percentiles of the frequencies of occurrence, returning to the second step if additional recordings are to be processed, otherwise comparing the total voice time, average pitch value, and distribution percentiles for each recording processed, and declaring the recordings duplicates that compared to within a user-definable threshold for total voice time, average pitch value, and distribution percentiles.

Inventors: 
Cusmariu, Adolf
Patent Number: 
Technical domain: 
IT and Software
FIle Date: 
2006-08-17
Grant Date: 
2009-08-04
Grant time: 
1,083 days
Grant time percentile rank: 
19
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY