Abstract
Frequency of periodic signals can be converted to lower frequency without distortion of original waveforms for use of a pen-writing oscillograph and an electromagnetic oscillograph by using sampling techniques.
In this paper, a new frequency control system for the frequency conversion is discussed. In this control system, the deviation of the output frequency from the setting frequency is detected by a new frequency detector from the difference between the reference point of the input waveform and the sampling pulses. The frequency of the sampling pulses is controlled by a PI controller. This frequency control system has a wide control range and automatically converts the frequency. The minimum setting time and the stability are also discussed.
