FREQUENCY-DOMAIN PERIODIC ACTIVE NOISE-CONTROL AND EQUALIZATION

This paper analyzes a frequency-domain periodic active noise control ( ANC) system, The adaptive filter employs the frequency domain complex least mean square (LMS) algorithm driven by a unit value at each frequ ency bin, The synchronously sampled frequency-domain adaptive structur e acts as a comb filter to cancel narrowband noises with harmonically related frequencies, A frequency-domain periodic active noise equaliza tion (ANE) system, which reshapes the residual noise by controlling th e output of the adaptive comb filter at each frequency bin, is also de veloped and analyzed in this paper, Computer simulations and real-time experiments conducted attest to the practical usefulness of the propo sed ANC and ANE systems.