what is the inverse of FrameGenerator

[ghost]

python essentia standard mode
MonoLoader -> FrameGenerator -> Windowing -> FFT -> IFFT -> ??? -> MonoWriter

[ghost]

FrameGenerator converts one-dimensional input to two-dimensional output, so a method is needed to convert two-dimensional input to one-dimensional output. The input and output of OverlapAdd are both one-dimensional, something must be wrong.

[palonso]

OverpadAdd is the algorithm you are looking for.

The input and output of OverlapAdd are indeed one-dimensional because you are expected to pass it every IFFT frame iteratively. In order to reconstruct the signal you can use, for example, numpy: np.stack(frames):

frames = [overlapAdd(frame) for frame in ifft_frames]
signal = np.stack(frames)

Additionally, have a look at this usage example using OverlapAdd in streaming mode.

[ghost]

maybe we need update the document