Amanni - 1 year ago 157

C++ Question

I'm working on an assignment to perform a 200 point DFT at a sampling frequency of 20kHz on a square wave of frequency 500Hz whose amplitude alternates between 0 and 20.

I'm using C++ and I have figured how to code the DFT equation, my problem is I'm having trouble representing the square wave in code using a for loop.

What I'm really still confused about is how many cycles of this square wave will be in my 200 point sample.

Thanks

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Answer Source

One cycle of your square wave will take 1/500 seconds. Each sample will be 1/20000 seconds. A simple division should tell you how many samples each square wave will be.

Another division will tell you how many of those waves will fit in your 200 point window.

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