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:
Jan. 16, 1990
Filed:
Jun. 30, 1989
Tetsuo Nishimoto, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A control waveform generating apparatus for an electronic musical instrument generates a control waveform having at least a rising portion and a falling portion whose levels vary in a lapse of time. The control waveform is divided into a plurality of segment waveforms each of which includes a constant level portion (an interval portion) and at least one of the rising portion and the falling portion therein. The rising rates and falling rates and interval durations of the respective segment waveforms are selected by a player so that the control waveform having an arbitrary waveform can be obtained. When generating the control waveform, each of the plural segment waveforms is sequentially designated and outputted as a part of the entire control waveform. When the present segment waveform next to the preceding segment waveform is designated, the last level of the preceding segment waveform is maintained in a selected interval period. After this predetermined interval period is passed, the level of the present segment waveform increases or decreases according to a selected rising rate or falling rate.