| 摘要 |
PURPOSE:To exactly obtain a frequency of a composite waveform even in the case when a feedback part is divided into a plural parts and formed to pipelines by providing a delay length control part for outputting delay length instruction data being fewer by a state number portion of a feedback circuit. CONSTITUTION:Sound pitch information is inputted to a delay length control part 11, and frequency data (m) is read-out of a frequency table 21. Thereafter, subtraction of the data (m) and the number of stages 4 of a feedback part 16 is executed by an adder 22, and delay length instruction data (m - 4) is sent out to an address control part 130. Subsequently, read-out/write of waveform data (x) corresponding to an address pointer instructed from the address control part 130 are executed by a delay use memory group 131. The waveform data (x) which is read out of the memory group 131 is sent out to the feedback part 16, and written in the memory group 131 after the processing by feedback circuits of four stages is executed. |
