TY - GEN
T1 - DSP Implementation of Adaptive Notch Filters with Overflow Avoidance in Fixed-Point Arithmetic
AU - Ishibashi, Satoru
AU - Koshita, Shunsuke
AU - Abe, Masahide
AU - Kawamata, Masayuki
N1 - Publisher Copyright:
© 2018 APSIPA organization.
PY - 2019/3/4
Y1 - 2019/3/4
N2 - In this paper, we implement adaptive notch filters with constrained poles and zeros (CPZ-ANFs) using fixed-point DSP. Since the CPZ-ANFs are IIR filters that have narrow notch width, a signal can be amplified significantly in their feedback loops. Therefore, direct-form II structure suffers from high probability of overflow in its internal state. When an overflow occurs in internal state of filters, inaccurate values due to the overflow are used repeatedly to calculate the output signal of the filters. As a result, the filters do not operate correctly and therefore we have to prevent such overflow. In order to avoid the overflow, we use direct-form I structure in implementation of the CPZ-ANFs. Experimental results show that our method allows the CPZ-ANFs to operate properly on the fixed-point DSP.
AB - In this paper, we implement adaptive notch filters with constrained poles and zeros (CPZ-ANFs) using fixed-point DSP. Since the CPZ-ANFs are IIR filters that have narrow notch width, a signal can be amplified significantly in their feedback loops. Therefore, direct-form II structure suffers from high probability of overflow in its internal state. When an overflow occurs in internal state of filters, inaccurate values due to the overflow are used repeatedly to calculate the output signal of the filters. As a result, the filters do not operate correctly and therefore we have to prevent such overflow. In order to avoid the overflow, we use direct-form I structure in implementation of the CPZ-ANFs. Experimental results show that our method allows the CPZ-ANFs to operate properly on the fixed-point DSP.
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U2 - 10.23919/APSIPA.2018.8659673
DO - 10.23919/APSIPA.2018.8659673
M3 - Conference contribution
AN - SCOPUS:85063510951
T3 - 2018 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2018 - Proceedings
SP - 1355
EP - 1360
BT - 2018 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2018 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 10th Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2018
Y2 - 12 November 2018 through 15 November 2018
ER -