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:
Aug. 07, 2001
Filed:
Sep. 30, 1999
Applicant:
Inventors:
Assignee:
Yamaha Corporation, Shizuoka-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10F 1/02 ;
U.S. Cl.
CPC ...
G10F 1/02 ;
Abstract
An automatic player piano determines the loudness of an acoustic tone to be reproduced in a playback on the basis of a hammer velocity, and the hammer velocity is calculated on the basis of a long distance defined in a shutter plate attached to each of the hammers for a strongly depressed key or a short distance also defined in the shutter plate for a softly depressed key so as to accurately produce the acoustic tone.