Overlap Add - which length to use?

1. What is difference between overlap-add and overlap save method?
2. What is FFT overlap?
3. What is overlap save method in DSP?

What is difference between overlap-add and overlap save method?

Two methods that make linear convolution look like circular convolution are overlap-save and overlap-add. The overlap-save procedure cuts the signal up into equal length segments with some overlap. Then it takes the DFT of the segments and saves the parts of the convolution that correspond to the circular convolution.

What is FFT overlap?

FFT convolution uses the overlap-add method together with the Fast Fourier Transform, allowing signals to be convolved by multiplying their frequency spectra. For filter kernels longer than about 64 points, FFT convolution is faster than standard convolution, while producing exactly the same result.

What is overlap save method in DSP?

Overlap–save is the traditional name for an efficient way to evaluate the discrete convolution between a very long signal xn and a finite impulse response FIR filter hn. Given below are the steps of Overlap save method − Let the length of input data block = N = L+M-1. Therefore, DFT and IDFT length = N.