PURPOSE: To vary a fundamental frequency and also to output a mixed two-frequency signal by reading a data stored in a ROM at an optional step.
CONSTITUTION: A sin wave data of 801 sampling between 0∼π/2 is stored in the ROM2 as 0∼4096 for example. An address signal advanced sequentially by the preset step number P is generated from an address generating section 1 and the sin wave data stored in the ROM2 is read and converted into an analog signal by a DA converter 3. When the sin wave is read from the ROM2 by the address signal advanced continuously by the set step number P a sinusoidal wave signal is outputted from the DA converter 3 and since the circuit is constituted that data 0 is inputted to the DA converter 3 once per twice, a 2-frequency signal is outputted from the DA converter 3 in this way.
OGAWA YASUNORI
TANAKA YASUO
SHIMOZONO RIYOUJI
