Tuning device for musical instruments and computer program used therein
AssigneeYamaha Corporation
InventorsFukutaro Okuyama, Rei Furukawa
Life of this patent
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Abstract
A tuning device includes an analog-to-digital converter for converting sound waves propagated from a piano to an audio signal in synchronism with a sampling signal and a data processor for visualizing a difference between a target pitch of a tone and an actual pitch of the tone; since the sampling signal is less accurate in frequency, the data processor previously determines the frequency difference between a design frequency and an actual frequency of the sampling signal by using a calendar clock signal as a measure; the data processor eliminates noise due to the sampling signal from visual images of the pitch difference, and makes the visual images more accurate.
Claims20
A tuning device for assisting a worker in a tuning work on a musical instrument, comprising:
- an input circuit for converting sound waves to an audio signal expressing music sound produced in said musical instrument in synchronism with a sampling clock having a design frequency with a relatively low accuracy;
- a determiner supplied with a reference signal having a design frequency with a relatively high accuracy, and determining a deviation between said design frequency of said sampling clock and an actual frequency of said sampling clock by using said reference signal as a measurer;
- and
- an informant supplied with said audio signal, and producing a piece of tuning information expressing tuning status of said musical instrument on the basis of an actual frequency of said audio signal and said deviation.
A computer readable medium having a computer program for producing a piece of tuning information expressing tuning status of a musical instrument, comprising the steps of:
- a) receiving a sampling signal having a design frequency with a relatively low accuracy and a reference signal having a design frequency with a relatively high accuracy;
- b) determining a deviation between said design frequency of said sampling signal and an actual frequency of said sampling signal by using said reference signal as a measurer;
- and
- c) producing a piece of tuning information expressing tuning status of said musical instrument on the basis of an actual frequency of said audio signal and said deviation.
Dependencies are inferred from the claim text.