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:
Mar. 03, 1981
Filed:
Oct. 03, 1979
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
A musical tone forming device comprises circuit system of digital calculation realizing frequency modulation technology in three different modes. In the first mode a plurality of frequency modulated waveforms are individually calculated in response to key depression and resultant data is added together to provide a musical tone signal, in the second mode, a signal waveform having a frequency corresponding to a depressed key is frequency-modulated with a plurality of signal waveforms, and in the third mode a signal waveform of a frequency corresponding to a depressed key is frequency-modulated in a multiple manner with a plurality of signal waveforms. Throughout these systems, the same component parts are commonly used and tone signals of the respective systems can be produced by a simple switching operation.