PAYMAN RAJAI wrote:
Hello Werner,
Thank you for the hint.
I guess they are more clear in the attached picture. (the indication numbers were in black color, not easy to see)
I had not looked at the attached picture, just the worksheet.
About the sum of two signals, is it correct to say:
The max of the sum corresponds to the coincidence of the signals maxima
The min of the sum corresponds to the coincidence of the signals minima
Yes, but only if we assume the the maxima or minima will coincide at one position.
How about the coincidence of one max and one min? in that case the sum would be close to zero but it may also happen when two signals zeros coincide with each other.
In this case the sum is useless anyway. Think of two signals with different amplitude - the sum would not be zero at all!
But here min and max of the difference signal do the job.
But you have to be aware that this is a discrete approach which works with the data points only. No interpolation or fitting is done. If there is no data point at the max or min, we miss it.
So Freds approach of finding amplitude, frequency and phase for both signals first might be more appropriate.
See attachment.
