Why does speed change pitch in normal players?

Question

Accepted Answer

A default player changes speed by "playing the sampled audio out faster or slower." Because this compresses or expands the entire frequency content of the waveform, the pitch inevitably moves with it — the same reason a tape sounds high-pitched when you fast-forward it. ToneBrowser splits the audio into short time frames, analyses the frequency spectrum of each, and then stretches or compresses the time axis while keeping the frequency content intact — a "phase vocoder" based algorithm. That is what makes it possible to change only the speed, change only the pitch, or adjust both independently. The "chipmunk effect" (the voice rising when you speed things up) is completely eliminated.

Why does speed change pitch in normal players?

ToneBrowser's phase vocoder approach

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