Tài liệu FFT Convolution

This chapter presents two important DSP techniques, the overlap-add method, and FFT
convolution. The overlap-add method is used to break long signals into smaller segments for
easier processing. 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.