DSP Implementation of Adaptive Notch Filters With Overflow Avoidance in Fixed-Point Arithmetic

被引：0

作者：

Ishibashi, Satoru ^{[1
]}

Koshita, Shunsuke ^{[1
]}

Abe, Masahide ^{[1
]}

Kawamata, Masayuki ^{[1
]}

机构：

[1] Tohoku Univ, Sendai, Miyagi, Japan

来源：

2018 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC) | 2018年

关键词：

CONSTRAINED POLES; ALGORITHM;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：1355 / 1360

页数：6

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