| 摘要 |
PURPOSE: To structurally control the tone color or tone spectrum of a musical sound by dividing the higher harmonic coefficients of all the sets into several adjacent higher harmonic coefficient groups, and generating the higher harmonic coefficients of one set. CONSTITUTION: When a keyboard switch 212 is operated, a series of repeated calculation cycles are started by an execution control circuit 216, main data sets are calculated during the period of each calculation cycle, and transferred to a note register related with each tone generator 101. Data stored in the note register are successively repeatedly read by a method corresponding to the constant multiple of the musical sound basic frequency of the keyboard switch 212, number incremented by an adder/accumulator 212 is repeatedly totaled, the higher harmonic coefficients of one subset expressed by DB units corresponding to each incremented number are prepared, and the DB values are converted into amplitude number corresponding to the higher harmonic coefficients of one set. |
