Method for pitch recognition, in particular for musical instrume

Details Method for pitch recognition, in particular for musical instrume Method for pitch recognition, in particular for musical instrume

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.

REFERENCES:
patent: 4688464 (1987-08-01), Gibson et al.
patent: 4817484 (1989-04-01), Iba
patent: 4841827 (1989-06-01), Uchiyama
patent: 4882965 (1989-11-01), McClish
patent: 4924746 (1990-05-01), Obata
patent: 5001960 (1991-03-01), Katou
patent: 5014589 (1991-05-01), Obata
patent: 5349130 (1994-09-01), Iwaooji

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