| 摘要 |
The number of waveform samples per unit time, i.e., waveform sample forming resolution is variably set depending on characteristics of a tone to be generated, such as construction of harmonic components in the tone. The number of waveform samples per unit time is increased for a tone or portion (e.g., attack portion) of a tone containing a relatively great number high-order harmonic components. Conversely, for a tone or portion (e.g., sustain portion) of a tone containing fewer high-order harmonic components, the number of waveform samples per unit time is decreased. By thus variably setting the waveform sample resolution, a process for arithmetically forming waveform sample data can be performed efficiently without involving significant waste. In cases where a plurality of tone generating channels are provided, the waveform sample forming resolution may be variably set independently for each of the channels. Also, in applications where the waveform sample data are to be stored in a waveform memory, effective data compression can be achieved by storing the waveform data with the waveform sample forming resolution variably set for each of different waveform segments.
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