Division-free phase-shift for digital-audio special effects

摘要: An audio special-effect is created by a slow phase shift. A series of all-pass digital filters are used to shift the an input stream digital-audio samples. The amount determined filter coefficients. coefficients increased and decreased sweep up down over relatively long period time such as one second per sweep. must be continuously re-generated processor each occurs. Coefficient generation loads processor, reducing performance other programs user applications. exact prior-art method requires division operation for coefficient generated. Since operations slow, especially burdened generation. approximate eliminates instead uses multiply or simpler operation. newly-generated sent from in digital-signal (DSP) update coefficients, generating special effect.