一种基于低复杂度联合编码方案的无损多通道生物信号压缩，用于便携式医疗设备。
A lossless multichannel bio-signal compression based on low-complexity joint coding scheme for portable medical devices.
作者信息
Kim Dong-Sun, Kwon Jin-San
机构信息
Embedded Software Convergence Center, Korea Electronic Technology Institute, #68 Yatop-dong, Bundang-gu, Seongnam-Si, Gyeonggi-do 463-816, Korea.
出版信息
Sensors (Basel). 2014 Sep 18;14(9):17516-29. doi: 10.3390/s140917516.
Research on real-time health systems have received great attention during recent years and the needs of high-quality personal multichannel medical signal compression for personal medical product applications are increasing. The international MPEG-4 audio lossless coding (ALS) standard supports a joint channel-coding scheme for improving compression performance of multichannel signals and it is very efficient compression method for multi-channel biosignals. However, the computational complexity of such a multichannel coding scheme is significantly greater than that of other lossless audio encoders. In this paper, we present a multichannel hardware encoder based on a low-complexity joint-coding technique and shared multiplier scheme for portable devices. A joint-coding decision method and a reference channel selection scheme are modified for a low-complexity joint coder. The proposed joint coding decision method determines the optimized joint-coding operation based on the relationship between the cross correlation of residual signals and the compression ratio. The reference channel selection is designed to select a channel for the entropy coding of the joint coding. The hardware encoder operates at a 40 MHz clock frequency and supports two-channel parallel encoding for the multichannel monitoring system. Experimental results show that the compression ratio increases by 0.06%, whereas the computational complexity decreases by 20.72% compared to the MPEG-4 ALS reference software encoder. In addition, the compression ratio increases by about 11.92%, compared to the single channel based bio-signal lossless data compressor.
近年来，对实时健康系统的研究受到了极大关注，个人医疗产品应用对高质量多通道医学信号压缩的需求也在不断增加。国际MPEG-4音频无损编码（ALS）标准支持一种联合信道编码方案，以提高多通道信号的压缩性能，这是一种非常高效的多通道生物信号压缩方法。然而，这种多通道编码方案的计算复杂度明显高于其他无损音频编码器。在本文中，我们提出了一种基于低复杂度联合编码技术和共享乘法器方案的多通道硬件编码器，用于便携式设备。针对低复杂度联合编码器，对联合编码决策方法和参考通道选择方案进行了改进。所提出的联合编码决策方法基于残余信号的互相关与压缩率之间的关系来确定优化的联合编码操作。参考通道选择旨在为联合编码的熵编码选择一个通道。该硬件编码器以40MHz的时钟频率运行，支持多通道监测系统的两通道并行编码。实验结果表明，与MPEG-4 ALS参考软件编码器相比，压缩率提高了0.06%，而计算复杂度降低了20.72%。此外，与基于单通道的生物信号无损数据压缩器相比，压缩率提高了约11.92%。
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