A VARIABLE COEFFICIENTS ADAPTIVE IIR NOTCH FILTER FOR BASS ENHANCEMENT
Rui Zhu, Feiran Yang, Jun Seok Yang · 2014
This paper presents a new variable coefficients adaptive IIR notch filter for bass enchantment. The coefficients of the notch filter are controlled by an onset detector in order to obtain both fast convergence rate and low misadjustment. A single side-band (SSB) modulation is used to enhance the system robustness when the fundamental frequency is close to 0 Hz. We also propose a novel harmonic generation algorithm to generate correct harmonics in the fundamental frequency rapidly changing situation. The effectiveness of the proposed method is verified by both computer simulations and subjective listening test.