I plotted a simple Cosine wave and After taking its FFT the frequency can be seen easily but after modifying the original signal to add more lower and higher frequencies, the higher ones are visible but the lower ones is not showing in the FFT plot,
Amplitude = 4 x=A*cos(2*pi*f*n);
Frequency of Wave:
Sampling Frequency =
100Hz frequency (original signal frequency) is supposed to be plotted at point 1 of FFT, which is fine,
When adding another higher frequency into the original signal,
x= 1*cos(2*pi*500*n) + x ;
500HZ frequency is added into the original signal and supposed to be plotted at point 5 of the FFt.
Which is fine, but when i am trying to add lower frequencies than higher they are not visible.
50Hz frequency to the original
100Hz Cosine wave,
what i think is
50Hz should be plotted at the 0.5 of the x-axis as it is half of the original frequency.
x= 1*cos(2*pi*50*n) + x ;
Where is the
50Hz frequency ?