Electronic musical instrument
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
-
Feb 14, 1989
Grant Date -
N/A
app pub date -
Sep 9, 1985
filing date -
Aug 29, 1978
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
More than one sub-intervals or time-windows are provided in a one-cycle period of a musical tone selected at a keyboard of an electronic musical instrument. Each time-window passes a sine wave having a frequency predetermined for the time-window. The envelope of the spectrum of a time-window is determined by the shape and the width of the time-window, and the envelope of the spectrum of a sine wave passed from the time-window will become the convolution of the spectrum of the time-window and the frequency of the sine wave. The total area of the frequency spectrum included as frequency components of a musical tone can be covered by several time-windows, each having a different length and passing a sine wave of a different frequency. An amplitude control means controls the amplitude of each sine wave independently. The controlled amplitude level determines the spectrum intensity of the frequency region influenced by the corresponding sine wave. When the levels of all the sine waves are properly controlled, the resultant harmonic contents will be a desired one which produces a desired tone quality.
First Claim
Other Claims data not available