Allpassphase Verified | 2026 Edition |

Keywords: allpassphase, all-pass filter, phase rotation, group delay, Schroeder reverb, audio phase cancellation, minimum phase, maximum phase, transient smearing.

τg(ω)=−dθ(ω)dωtau sub g open paren omega close paren equals negative the fraction with numerator d theta open paren omega close paren and denominator d omega end-fraction allpassphase

: When equalizing group delay, the final group delay is the sum of the group delays of the reference filter and the all-pass equalizer. audio phase cancellation

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The key to the all-pass filter lies in its pole-zero geometry. A filter maintains a constant magnitude response if its transfer function satisfies a specific symmetry: .