| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the occurrence of sound breaks and drawing delay due to the increase in the number of sounds simultaneously emitted in response to simultaneous touch operations of a plurality of virtual performance operators drawn on a screen. <P>SOLUTION: When one or more touch operations of virtual performance operators drawn on the screen are detected, a processing load relating to musical sound waveform generation in musical sound generation means which generates musical sound waveforms associated with the virtual performance operators and controls drawing of them is measured. Virtual performance operators are specified with respect to only partial touch operations out of the one or more touch operations in accordance with the measured processing load, and the musical sound generation means is instructed to generate prescribed musical sound waveforms associated with the specified virtual performance operators and control the drawing of them. Accordingly, generation and drawing of musical sound waveforms can be controlled without applying an excessive processing load to the musical sound generation means, and the number of simultaneously emitted sounds is not increased even when touch operations of many virtual performance operators are simultaneously performed, so that sound breaks and drawing delay cannot occur due to the increase in the number of simultaneously emitted sounds. <P>COPYRIGHT: (C)2012,JPO&INPIT |
