Method and system for measurement of speech distortion from samples of telephonic voice signals
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United States of America Patent
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May 13, 2003
Grant Date -
Aug 16, 2001
app pub date -
Apr 24, 2001
filing date -
May 18, 1999
priority date (Note) -
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Abstract
A system that provides measurements of speech distortion that correspond closely to user perceptions of speech distortion is disclosed. The system calculates and analyzes first and second discrete derivatives to detect and determine the incidence of change in the voice waveform that would not have been made by human articulation because natural voice signals change at a limited rate. Statistical analysis is performed of both the first and second discrete derivatives to detect speech distortion by looking at the distribution of the signals. For example. the kurtosis of the signals is analyzed as well as the number of times these values exceed a predetermined threshold, Additionally. the number of times the first derivative data is less than a predetermined low value is analyzed to provide a level of speech distortion and clipping of the signal due to lost data packets.
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