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February 11th, 2014, 01:41 PM  #1 
Newbie Joined: Feb 2014 Posts: 2 Thanks: 0  period difference over changing frequency
Hello...I have joined in the hope that someone can point me at the right approach to this programming problem I have. I'm fairly sure integration/differentiation is the solution, but that is the point at which my mathematical education left me bewildered! I am calculating the frequency of a pulse wave by way of measuring its period using a timer. For the purposes of this problem, I am happy to assume that the frequency is changing linearly from one value to another (from 200Hz to 50Hz) over the course of 1 second. I need to calculate if the rate of change is greater or less than that...however, I am limited to measuring the period of two consecutive cycles. I need to know how to work out the proportional difference from one pulse to the next if the frequency is changing at that rate, so to be able to calculate if the actual rate is above or below that rate. How should I go about this? 
February 12th, 2014, 06:33 AM  #2 
Newbie Joined: Feb 2014 Posts: 2 Thanks: 0  Re: period difference over changing frequency
Never mind I have decided to find it empirically using an oscilloscope... Roughly 2% seems to be the answer  I can tweak from there. 

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