JPS6150997U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is an overall block diagram of an electronic musical instrument according to an embodiment of this invention, Fig. 2 is a diagram showing the contents of the key code, Fig. 3 is a flowchart explaining the operation, and Fig. 4 is a diagram showing the contents of the key code.
The figure shows the principle of musical tone generation for the key code OSCn, Figure 5 shows how the portamento execution time T is always constant, and Figures 6 and 7 show how the pitch rises or falls, respectively. Figure 8 is a diagram showing how the next portamento performance is performed while an upward portamento calculation is already being performed, and Figure 9 is a diagram showing how the next portamento performance is performed while a descending portamento performance is already being performed. FIG. 6 is a diagram showing how the next portamento performance will be performed. 1... Keyboard, 2... CPU, 3... Portamento volume, 4, 5, 6, 7, 8, 9,
10, 11, 12...Register, 13...Timer, 14...Frequency data converter, 15...Tone generator.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an electronic musical instrument that has a keyboard and uses digital calculation to sequentially change the frequency of musical tones corresponding to the operated keys to obtain a portamento effect or glitzando, the following: An electronic musical instrument comprising means for starting execution of digital calculations up to the pitch frequency of the next key press, starting from the calculation frequency value at the time of the key press. (2) The electronic musical instrument according to claim 1, wherein the digital calculation time for the previous and current keys is always constant.