| 摘要 |
<p>A parameter generation circuit (20) sequentially generates differernt tone forming parameters by timewise changing them in a predetermined sequence. A sequence control circuit (21) performs a control so as to repeat the sequential generation of the different tone forming parameters in the parameter generation circuit (20). The sequentially generated tone forming parameters are applied to a tone forming circuit in which a tone signal having tone color characteristics based on these tone color forming parameters is formed. The tone color characteristics of the tone signal formed undergoes timewise change due to the timewise change in the tone forming parameters. By repeating the sequential generation sequence of the tone forming parameters, an adequate tone color variation can be realized notwithstanding that a relatively small number of tone forming parameters may be used. Depending upon the tone forming system used in the tone forming circuit, various tone forming parameters such as filter coefficients, harmonic coefficients and frequency modulation operation parameters may be used for forming of the tone signal.</p> |
