| 摘要 |
PURPOSE:To readily and surely obtain signals of waveforms corresponding to respective intervals by subsequently determining the sampling points of the waveforms for the same intervals with the values subsequently integrating the sampling intervals being read out from memories. CONSTITUTION:Sampling intervals X1, X2,...X88 for respective intervals are converted to binary codes of respectively specified bit numbers and written in respective words of 88 of the ROM 71 in a retrieval circuit 7 and the respective intervals are determined according to the reference frequencies of the respective intervals. The words of 88 of RAM 72 are also written with the sampling positions of the waveforms for momentary intervals in correspondence to the respective intervals as binary codes of specified bit numbers. When power source is turned on, the word for the interval A0 of both memories is addressed and X1 is read out from the ROM 71 and 0 from the RAM 72 respectively. The output of an adder 73 then becomes X1, which is stored in a buffer 74. In a DA converter 74, one step of the pitch corresonding to the value of X1 of the staircase signals is formed. Thereby, the signals of the waveforms corresponding to the respective intervals may be surely obtained. |
