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. 29, 1986
Filed:
Jan. 24, 1985
David T Starkey, San Diego, CA (US);
CBS Inc., New York, NY (US);
Abstract
A digital tone generator for a keyboard electronic musical instrument is described. The generator is of the waveshape memory type and repetitively interpolates between successive stored sample points thereby to effectively multiply the number of samples representing the waveshape so as to produce an output tone signal having reduced quantization error. Envelope errors are minimized by using cascade-connected multiplying digital-to-analog converters for multiplying the waveshapes derived from the interpolation with digital signals representative of an envelope waveshape. The system also includes a novel modification of a known multiplying digital-to-analog converter which greatly increases its speed of operation and makes possible the generation of clean output tone signals at the extremely high bit rates required to accomplish the interpolation.