| US 7,521,618 B2 | ||
| Tuning device for musical instruments and computer program used therein | ||
| Fukutaro Okuyama, Shizuoka-ken (Japan) | ||
| Assigned to Yamaha Corporation, Shizuoka-Ken (Japan) | ||
| Filed on Jun. 30, 2006, as Appl. No. 11/480,208. | ||
| Claims priority of application No. 2005-194792 (JP), filed on Jul. 04, 2005. | ||
| Prior Publication US 2007/0000369 A1, Jan. 04, 2007 | ||
| Int. Cl. G10G 7/02 (2006.01) | ||
| U.S. Cl. 84—454 [84/455; 84/723] | 20 Claims |
| 1. A tuning device for assisting a user in a tuning work on a musical instrument, comprising:
a converter converting vibrations representative of a tone produced in said musical instrument to an electric signal representative
of said vibrations;
a data processing system connected to said converter, carrying out a multiple-step autocorrelation on a waveform of said electric
signal, and narrowing down a frequency range featuring said tone so as to determine a certain register within which said tone
is fallen through an earlier execution of said multiple-step autocorrelation and a pitch of said tone through a later execution
of said multiple-step autocorrelation; and
a man-machine interface connected to said data processing system, and visualizing a result of said multiple-step autocorrelation.
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