A less computationally expensive alternative to sinusoidal summation
is called *overlap-add *reconstruction
[1,3] which consists of the following
steps:

6. Apply any desired modification to the spectra, such as multiplying by a filter frequency response function, to obtain the modified frame spectrum . Additionally, desired spectral components can be added to the FFT buffer [4,21].

7. Inverse FFT to obtain the windowed output frame:

8. Reconstruct the final output by overlapping and adding the windowed output frames:

for every . If the overlap-added window function is not constant, it is then an

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