| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem how an analog continuous frequencies signal is divided into digital scales, to form a conversion circuit according to its dividing method, in order that sound of an electronic musical instrument is formed in the same scale system as an ordinary musical instrument, as fantastic and fascinating sound of a beat type electronic musical instrument is in continuous frequencies without separation and hard to play, and it is hard to discriminate a pitch even by listening the sound. <P>SOLUTION: A musical scale is in stepwise arrangement with predetermined frequencies and ratios, depending on musical instruments. If a boundary frequency by the same ratio between scales is determined and a region of each scale is specified and related to a signal frequency, each scale frequency can be specified. That is, all signal frequencies in the region converge in one, to the scale frequency of their center. The conversion in one is the most important point of the invention. The conversion circuit is composed of seven general purpose analog circuits. <P>COPYRIGHT: (C)2008,JPO&INPIT |
