Importance

Loading Importance Indicators...

Abstract

To waveform data is applied not only a predetermined data compression processing but also a processing for further reducing the value of waveform data in accordance with a weight coefficient, which processing is performed at least at one stage selected from a stage before the data compression processing is performed, a stage when the data compression processing is being performed and a stage after the data compression processing has been completed. Data compression can thereby be performed to a further degree. A control for changing the rate of reduction or for not changing such rate at all can be made in a simple manner merely by changing the weight coefficient without changing the predetermined data compression processing system. Waveform sample data or tone control data consisting of multiple samples may be divided into plural sections each consisting of plural samples and a maximum value of effective bit number of sample data for each section may be detected. These sample data may be adjusted, for each section, to have a bit number corresponding to the detected maximum value for each section and the bit-number-adjusted sample data may be stored in a memory. Memory elements necessary for effective bits of data only are thereby occupied and unnecessary memory elements are not occupied and, therefore, saving of memory capacity and effective use of a memory can be realized.

Loading the Abstract Image...

First Claim