How to calculate fourier series coefficients for a sawtooth wave?

I am not sure how to calculate fourier series coefficients after importing the audio file of the Tuning note A4 and graphing it. I am getting a sawtooth wave. I am not sure how to apply the fourier series function to it?

Thank you

Answer 1

[Star Strider]

If you have the sampling frequency ‘Fs’, you can use the fast Fourier transform fft (link) function to calculate the numerical transform. The coefficients will be the transform results, the real components as the cosine coefficients, and the real part of the imaginary components the sine coefficients.