Hi, I am totally a non-math guy. I had to attend a training (on automobile noise signals) that had a session discussed about Fourier Transform (FT). Let me pl. write down what I understand: "The noise signal observed at any point in the transmission line can be formed using a sum of many sine waves. The one having the lowest frequency is called the fundamental frequency or first harmonic. All the other waves are multiples of first harmonic. As we extend the series till infinity (ie. till infinite no. of harmonics), the exact wave generated by transmission noise can be created" Assuming what I understand is right, I have one question here to ask - Is there a possibility that the output noise of transmission be generated by other combination of waves that is different from Fourier Series (FS)? If my question was confusing, pl. let me try to explain with this analogy: The output noise signal of transmission be replaced with a number 10. When FT is applied on this no., FS is 5+2.5+1.25+0.625 etc. But the same no. 10 can be produced by 5+3+2 as well. Does a similar possibility exist for waves as well? Thanks.