| 摘要 |
PURPOSE:To form a multi-frequency signal by storing each PCM signal data having a fundamental frequency component constituting the multi-frequency signal in a memory, reading the PCM signal data from this memory and processing addition while matching the time axis. CONSTITUTION:The PCM signal data as a result of sampling respectively the fundamental frequency of the multi-frequency signal at a prescribed period to is stored each sectional area of an ROM1 according to a time series. The selector SEL 5 switches to output the content of 2<0> digit of a frequency counter FCNT4, the content of 2<1> digit, a 3-bit data of the 1st group giving ''0'' to the most significant digit, the content of 2<2> digit, the content of 2<3> digit and a 3-bit data of the 2nd group giving ''1'' to the most significant digit in response to a clock. Further, the output is merged with the content of a word counter WCNT3 and the ROM1 is accessed. Further, the PCM signal read from the ROM1 is added at an adder circuit ADD6 and the result is outputted as the multifrequency signal. |
