Perception of Phase Distortion in Anti-Alias Filters
Experimental results on the audibility of phase distortion produced by minimum-phase 4-kHz and 15-kHz anti-alias filters are reported. Numerous impulse response pairs with identical spectral magnitudes but linear-phase and minimum-phase responses were compared by five test subjects who listened diotically (same signal at both ears) on earphones. Group-delay distortion was doubled, progressively, until at least 67% mean correct discrimination was attained. At 4 kHz the phase distortion introduced by a cascade of two eighth-order Butterworth filter pairs was audible, as was that from only a single pair of seventh-order elliptic filters. At 15 kHz the cascade of up to 4 pairs of seventh-order elliptic filters introduced no perceptible effects. Experimental details and several representative filter frequency and transient responses are included.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.