Canceling and selecting partials from musical tones using fractional-delay filters
Computer Music Journal
Technical Communication: Hybrid method for designing digital Butterworth filters
Computers and Electrical Engineering
Digital linear phase notch filter design based on IIR all-pass filter application
Digital Signal Processing
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This paper presents a two-stage approach for designing an infinite impulse response (IIR) notch filter. First, the numerator of the transfer function of the IIR notch filter is obtained by placing the zeros at the prescribed notch frequencies. Then, the denominator polynomial is determined by using an iterative scheme in which the optimal pole placements are found by solving a standard quadratic programming problem. For stability, the pole radius in the single notch filter design is specified by the designer, and in the multiple notch filter design, the pole radius is constrained by using the implications of Rouche's theorem. Examples are included to illustrate the effectiveness of the proposed techniques