The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1999
Filed:
Dec. 02, 1997
Yasutoshi Kaneko, Shizuoka, JP;
Kiyoshi Kawamura, Shizuoka, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
An acoustic piano, solenoid-operated key actuators for moving black/white keys in response to a driving signal and an electric system form in combination a keyboard musical instrument, and the electric system previously establishes first relations between key motions and associated hammer motions and second relations between the magnitude of the driving signal and final hammer velocity; the electric system estimates the final hammer velocity and a time delay between a key-on timing and an impact timing on the basis of the first relations for producing pieces of music data information in a recording mode, and tailors the driving signal on the basis of the second relations in a playback mode for exactly reproducing the original performance.