Vibrato detection modules in a system for automatic transcription of sung or hummed melodies
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United States of America Patent
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Jul 23, 2013
Grant Date -
May 14, 2009
app pub date -
Nov 3, 2008
filing date -
Nov 2, 2007
priority date (Note) -
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Abstract
The technology disclosed relates to audio signal processing. It includes a series of modules that individually are useful to solve audio signal processing problems. Among the problems addressed are buzz removal, selecting a pitch candidate among pitch candidates based on local continuity of pitch and regional octave consistency, making small adjustments in pitch, ensuring that a selected pitch is consistent with harmonic peaks, determining whether a given frame or region of frames includes harmonic, voiced signal, extracting harmonics from voice signals and detecting vibrato. One environment in which these modules are useful is transcribing singing or humming into a symbolic melody. Another environment that would usefully employ some of these modules is speech processing. Some of the modules, such as buzz removal, are useful in many other environments as well.
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