A narrowband IIR digital filter with low sensitivity and roundoff noise
Date of Original Version
An efficient infinite-impulse response (IIR) structure is produced via spectral transformation of an appropriate finite-impulse response (FIR) prototype design. The filter specifications are prewarped to a halfband design by an allpass relationship to produce the efficient FIR prototype. The allpass coefficient is chosen to be exactly realizable with a small number of multiplier bits. Hence, the only coefficient quantization required is for the original FIR coefficients, which are relatively insensitive. The roundoff noise for fixed-point implementations is also quite low compared with conventional IIR designs. Scaling for overflow can be avoided completely, or, to save multipliers, a simple scale factor can be employed.
Publication Title, e.g., Journal
IEEE Signal Processing Letters
Jackson, Leland B.. "A narrowband IIR digital filter with low sensitivity and roundoff noise." IEEE Signal Processing Letters 10, 6 (2003): 164-167. doi: 10.1109/LSP.2003.811658.