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:
Jul. 12, 1994
Filed:
Jul. 18, 1991
Youji Kaneko, Kokubunji, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A digital audio signal prerecorded in a DAT is processed by a computer to calculate a compressed difference data array. This compressed difference data array is obtained by compression processing on the basis of a variable compression ratio depending on the magnitude of the variation of the original waveform data array. This compressed difference data array is written in a ROM as waveform data for musical tone generation, and the ROM which stores the waveform data is used as a circuit arrangement for an electronic musical instrument. The electronic musical instrument expands the compressed difference data array on the basis of expansion ratio data, and reproduces it as a waveform data array. This waveform data array is audibly output as a musical tone signal.