We offer training classes and eBooks on DSP, and in Media Processing (TriMedia) Company logo

Introduction to DSP - frequency: convolution

Convolution is a weighted moving average with one signal flipped back to front:

Convolution equation

Convolution is the same as multiplying frequency spectra.

Convolution of a signal

Convolution by multiplying frequency spectra can take advantage of the Fast Fourier Transform - which is a computationally efficient algorithm. So this can be faster than convolution in the time domain, and is called Fast Convolution.

backward/forward go back to start of module go back to previous page go to next page go to next module