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C++ API

: fftfilt (b, x)

: fftfilt (b, x, n)

Filter x with the FIR filter b using the FFT.

If x is a matrix, filter each column of the matrix.

Given the optional third argument, n, fftfilt uses the overlap-add method to filter x with b using an N-point FFT. The FFT size must be an even power of 2 and must be greater than or equal to the length of b. If the specified n does not meet these criteria, it is automatically adjusted to the nearest value that does.

See also: filter, filter2.

Package: octave

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