| 摘要 |
PURPOSE:To simplify the circuit and to obtain versatile waveforms by storing digitally an optional waveform to a ROM or an EPROM, reading it at a prescribed period and using a digital/analog converter to convert the waveform into an analog waveform. CONSTITUTION:An optional waveform is stored digitally in a waveform storage ROM3. The waveform is outputted through the digital/analog converter 4 and a buffer amplifier 5 by designating an address to read it. The address is designated by using an address signal source 1 and an address couner 2 and the address signal source 1 consists of a crystal oscillator 6, a phase locked loop 7, a low pass filter 8, a voltage controlled oscillator 9, and a frequency division circuit 10. The output of the address signal source 1 is frequency-divided by the address counter 2 also. Since the crystal oscillator 6 is used, a stable frequency is obtained. |
