( |H(j\omega)| = 1 ) for all ( \omega ) ( \angle H(j\omega) ) varies with frequency.
The keyword represents the frontier of audio engineering—the shift from simply controlling volume to controlling the flow of time itself. It is a humble tool: it does not boost bass, slash treble, or compress dynamics. Yet, it can make a mix sound louder, a reverb sound smoother, and a room sound wider. allpassphase
An all-pass filter is a signal processing block with a unique, almost paradoxical property: It does not boost or cut any part of the frequency spectrum. If you run white noise through an all-pass filter, the resulting frequency spectrum looks identical. ( |H(j\omega)| = 1 ) for all (