Howtosignalprocessing
- What is the Y axis in frequency domain?
- What is the output of discrete Fourier transform?
- What are types discrete Fourier transform?
What is the Y axis in frequency domain?
The Y axis (amplitude)
Frequency-domain measurements are sometimes viewed with a linear Y axis and a linear X axis, but usually must be viewed with a logarithmic Y axis, because this is the only way to view very small signals and much larger signals simultaneously. Let's look at the spectrum of a sine wave.
What is the output of discrete Fourier transform?
From this input, the DFT produces 2 real values and 31 complex values, and the other 31 values returned by the DFT are just complex conjugates of the aforementioned complex values. If we look at the dimensions of the DFT result, we get 2+31*2 which is, again, 64 dimensions.
What are types discrete Fourier transform?
The discrete Fourier transform is an invertible, linear transformation. with denoting the set of complex numbers. Its inverse is known as Inverse Discrete Fourier Transform (IDFT). In other words, for any , an N-dimensional complex vector has a DFT and an IDFT which are in turn. -dimensional complex vectors.
