Music – Accessories – Tuning devices
Patent
1995-12-19
1998-07-14
Shoop, Jr., William M.
Music
Accessories
Tuning devices
84455, 84616, 84654, 84DIG18, G10G 702
Patent
active
057807590
ABSTRACT:
A method is specified for pitch recognition, in particular for musical instruments which are excited by plucking or striking, in the case of which method the interval between zero crossings of a signal waveform of an audio signal is used as a measure for the period length of the audio signal.
Reliable pitch recognition is intended to be possible in a simple manner using such a method. The method is intended to be capable of being implemented with a low level of computation power.
To this end, the magnitude of the gradient of the signal waveform is in each case determined in the region of its zero crossings, and the magnitude of the gradient is used as an assessment criterion for the selection of the zero crossings to be evaluated.
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patent: 4924746 (1990-05-01), Obata
patent: 5001960 (1991-03-01), Katou
patent: 5014589 (1991-05-01), Obata
patent: 5349130 (1994-09-01), Iwaooji
Blue Chip Music GmbH
Fletcher Marlon T.
Shoop Jr. William M.
Yamaha Corporation
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