| 摘要 |
A plurality of waveshapes of different characteristics are stored in a waveshape memory among which a waveshape to be read out is selected in accordance with a selected tone color or elapse of time and data of the selected waveshape is read out. At least one waveshape among the waveshapes stored in the waveshape memory is coded in a coding form different from one used for the other waveshapes. For matching characteristics of each individual waveshape, waveshapes are coded according to respectively suitable coding forms such, for example, that one waveshape is coded according to the pulse code modulation system, another waveshape according to the differential pulse code modulation system and still another waveshape according to the delta modulation system. The waveshape data read out from the waveshape memory is converted in its code to a predetermined common coding form (e.g. PCM). By differring the coding form of waveshapes stored in the waveshape memory, reduction in the memory capacity and improved resolution in reproduced waveshapes matching characteristics of individual waveshapes can be achieved.
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