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:
Dec. 10, 1991
Filed:
Nov. 27, 1989
Noboru Watanabe, Tokyo, JP;
SC HighTech Center Corp., Tokyo, JP;
Abstract
An electronic tone generator in which a plurality of types of scale data and tone-length data are stored in an associative arrangement at predetermined addresses in a single storage device. The plurality of types of scale data read from the single storage device are input to corresponding waveform generators, where melody-waveform signals are generated. The melody-waveform signals generated in the respective waveform generators are mixed and synthesized by a mixer before being output from an output device. The waveform generators are adapted to switch envelope waveforms generated by envelope-waveform generators of a digital circuit configuration with waveform signals corresponding to the scale data, thereby obtaining melody-waveform signals. One of the waveform generators is adapted to generate a melody-waveform signal having a frequency which is an integral multiplication of the frequency of a main melody, for example, three times the frequency thereof, or to generate a melody-waveform signal giving a tremolo effect. To this electronic tone generator can be added a waveform generator for generating a percussion-waveform signal; the melody-waveform signals can be mixed and synthesized with the percussion-waveform signal, which makes it possible to output a melody with an accompaniment.