


Stage 1 
: 
The first pulse P0 appear initially, the period is not defined. So, the output is still zero. 

Stage 2 
: 
When the next pulse P1 comes the output V1 calculated proportional to reciprocal value of pulse interval (period) T1 appears. 

Stage 3 
: 
By coming pulse P2, the output V2 appears. Here, the output V2 becomes higher than V1 by reason of the interval T2 is shorter than T1. 

Stage 4 
: 
If the P3 makes same interval as T2, the output still remain same voltage. 

Stage 5 
: 
If the following pulse delayed as P4, the hyperbola forecast computation begins from time point of imaginary pulse P3. (The 2 reciprocal numbers are relationship of right angle hyperbola.) 

Stage 6 
: 
The next pulse P4 freezes a point of hyperbola forecasting curve. The voltage of the point is V3, which is equal to reciprocal value of T3. 

Stage 7 
: 
If the manyfold of sudden increase of incident frequency, the analogue output rises to V4 corresponding input change shown T4. When the pulses continue in a same period the output keeps a voltage with no ripple shown in V4. 

Stage 8 
: 
For input pulse stop the hyperbola forecast starts after last pulse interval from last pulse. And after a settled timing the output voltage is cut down to zero as stop forecast. The settled timing is given as a coefficient of stop forecast. Actually the coefficient is given an integer. In all over applicable range, the forecast is done in relation to input frequency to obtain optimum operation. 

Stage 9 
: 
If an input pulse P12 came after long period of stop reaction, an output V5 is given soon because of defined interval T5 that is determined with last pulse and new pulse P12. 