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:
May. 07, 1996
Filed:
Apr. 14, 1994
Miyuki Imamura, Tokyo, JP;
Seikosha Co., Ltd., Tokyo, JP;
Abstract
An envelope waveform producing circuit includes a ROM for storing a plurality of groups of parameter data, each group of parameter data defining a waveform of an envelope which includes data representing at least one of an attack rate and an attack level and data representing at least one of a decay rate and a sustain level, an address designator, connected with the ROM, for reading out a desired group of parameter data from the ROM to cause an envelope waveform to be produced in accordance with the parameter data read out, an UP/DOWN counter for selectively counting up and down from a preset value, a coincidence detector, connected with the UP/DOWN counter, for detecting coincidence between a counted value of the UP/DOWN counter and a predetermined value, a control circuit, connected with the UP/DOWN counter and the address designator, for controlling the address designator to read out desired parameter data and for controlling the UP/DOWN counter to count up or down from the preset value, and activation or deactivation of the UP/DOWN counter.