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. 31, 1981
Filed:
Jul. 07, 1978
Koji Niimi, Hamamatsu, JP;
Mitsumi Kotah, Hamamatsu, JP;
Abstract
In an electronic keyboard musical instrument, the operation of a key causes a corresponding frequency information signal to be read out of a frequency information memory. The frequency information signal represents a counting number and is repeatedly accumulated in an accumulator at a first clock rate. The accumulator generates carry signals at a frequency defining a tone frequency. A wave shape memory stores sample values of a wave shape, and a counter addresses this memory to read out the wave shape. The counter is driven at a second clock rate to successively address the sample values one after another, but is reset by the carry signals to restore it to its initial state. Thus the memory generates only those sample values of the wave shape which fall within the carry signal period from the beginning. The tone colors will vary from one tone frequency to another.