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:
Nov. 20, 1990
Filed:
Mar. 29, 1990
Takashi Tamaki, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
In order to eliminate the disadvantages due to varieties of a string-striking speed (i.e., dynamic characteristic) of a hammer, a hammering operation control unit is applied to a piano accompanied with an automatic performance function which can reproduce a musical performance recording in advance. Based on a detected string-striking speed of the hammer which is driven by the reference drive value predetermined to each key, the hammering operation control unit computes a deviation from the target string-striking speed corresponding to the reference drive value as a compensation value. Then, the newest computed compensation value is stored in a memory device or medium such as a floppy disk by periodically renewing the stored compensation value. Based on the stored compensation value, the string-striking speed of the hammer is to be compensated.