overlap-add

Overlap-add fundamentally requires window functions: overlapping segments are windowed before summation. Remove windowing and overlap-add has no mechanism for proper segment reconstruction — it stops operating. The removal test passes.

Overlap-add reconstructs a continuous signal from overlapped frame segments. Remove the concept of frame and overlap-add has no operational structure — it stops working. Direction tested: frame → overlap-add (frame is needed for overlap-add to function).

Overlap-add is a specific signal-processing technique for reconstructing signals from overlapping frames; a competent speaker calls it a type of signal processing operation.

Phase vocoder uses overlap-add as its signal reconstruction mechanism: after modifying STFT phases, it must overlap and add the modified frames to produce the output signal. Remove overlap-add and phase vocoder stops operating — it has no reconstruction mechanism.

Griffin-Lim reconstructs audio via inverse-STFT with overlap-add: its iterative procedure produces short-time frames that must be overlap-added to form the continuous output signal. Remove overlap-add and Griffin-Lim cannot reconstruct the time-domain signal — its operation collapses.

Pitch-synchronous overlap-add is a specific variant of overlap-add synthesis where frames are aligned to pitch periods. It is a kind of overlap-add method, not a separate domain.

PSGIA requires overlap-add as its core synthesis mechanism — frames are computed by pitch-synchronous analysis but assembled by overlap-add. Remove overlap-add and PSGIA cannot recombine frames. Per Law 8: DEPENDS_ON.