"The U.S. Patent and Trademark Office on Tuesday granted Apple a patent for polyphonic note detection, or the ability to parse out single pitches and tones from a plurality of voices, a technology that may make its way to an expected version of the company's Logic Pro music editing software.
Aptly-named "Polyphonic note detection," U.S. Patent No. 8,309,834 describes a method in which a polyphonic audio signal is converted and sampled against a reference note to distinguish individual voices.
Prevailing technology is limited to detecting single notes, such as a person singing or the picking of a single string on a guitar, which can be used for a number of audio applications like tuning, music creation and pitch correction. With polyphonic detection, a user would be able to tune all strings on a guitar with a single strum.
While there are certain algorithms on the market for digital audio workstations, such as Melodyne from Celemony, Apple has yet to include the feature in its own Logic DAW..." Full post here.
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