编码精度自调节的心电压缩ASIC  

An ECG compression ASIC with self-adjustable encoding precision

作　　者：徐焕章 罗嘉蕙 陈志坚 XU Huan-zhang, LUO Jia-hui, CHEN Zhi-jian(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《传感器与微系统》2018年第9期98-100,104,共4页Transducer and Microsystem Technologies

摘　　要：针对编码精度固定导致不同样本压缩率不稳定的问题,提出了一种基于5/3提升小波的编码精度自调节的心电(ECG)信号压缩专用集成电路(ASIC)。根据ECG信号的抖动程度动态自调节编码精度,将压缩率稳定在较高水平。通过逆向扫描避免了嵌入式零树小波(EZW)编码中的递归运算,降低电路复杂度。设计的电路在压缩率为23. 91情况下仅有3. 86%失真度。在40 nm CMOS工艺下,ASIC实现仅有9 885个等效门,在1. 1V的供电电压下,功耗仅为7. 11μW。To solve the problem of instable compression rate of different samples which caused by the fixed encoding precision,an electrocardio（ ECG） signal compression application specific IC（ ASIC） circuit with selfadjustable encoding precision based on 5/3 lifting wavelet is proposed. It can self-adjust coding precision dynamically according to the dithering degree of ECG signal,and stabilize the compression rate at a higher level. A reverse scanning mechanism is proposed to avoid the recursive operation of embedded zerotree wavelet（ EZW）encoding and it further reduces the complexity of the circuit. The proposed design only has degree of distortion of3. 86 %,while compression rate is 23. 91. In 40 nm CMOS process,the ASIC implement only has 9 885 equivalent gate count,with a power consumption of 7. 11 μW at 1. 1 V voltage.

关 键 词：提升小波变换 嵌入式零树小波编码 精度自调节 逆向扫描 低功耗 

分 类 号：TN911.7[电子电信—通信与信息系统]