Low-power digital filtering using approximate processing

被引：77
|
作者：
Ludwig, JT [1 ]
Nawab, SH [1 ]
Chandrakasan, AP [1 ]
机构：
[1] BOSTON UNIV,KNOWLEDGE BASED SIGNAL PROC GRP,BOSTON,MA 02215
来源：
IEEE JOURNAL OF SOLID-STATE CIRCUITS | 1996年 / 31卷 / 03期
关键词：
D O I：
10.1109/4.494201
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：
We present an algorithmic approach to the design of low-power frequency-selective digital filters based on the concepts of adaptive filtering and approximate processing. The proposed approach uses a feedback mechanism in conjunction with well-known implementation structures for finite impulse response (FIR) and infinite impulse response (IIR) digital filters; Our algorithm is designed to reduce the total switched capacitance by dynamically varying the filter order based on signal statistics. A factor of 10 reduction in power consumption over fixed-order filters is demonstrated for the filtering of speech signals.
引用
收藏
页码：395 / 400
页数：6
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