A Lossless Multichannel Bio-Signal Compression Based on Low-Complexity Joint Coding Scheme for Portable Medical Devices

Sensors - Tập 14 Số 9 - Trang 17516-17529
Dong–Sun Kim1, Jung Ah Kwon1
1Embedded Software Convergence Center, Korea Electronic Technology Institute, #68 Yatop-dong, Bundang-gu, Seongnam-Si, Gyeonggi-do 463-816, Korea

Tóm tắt

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.

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Tài liệu tham khảo

Chua, 2011, Mixed bio-signal lossless data compressor for portable brain-heart monitoring systems, IEEE Trans. Consum. Electron., 57, 267, 10.1109/TCE.2011.5735512

Sriraam, 2008, An Adaptive Error Modeling Scheme for the Lossless Compression of EEG Signals, IEEE Trans. Inf. Tech. Biomed., 12, 587, 10.1109/TITB.2007.907981

Sgouros, N.P., Constantinou, I.P., Loudos, G.K., and Kossida, S.A. (2007, January 15–18). Use of the MPEG-4 ALS Architecture and Inter-Channel Prediction for Multi-Channel ECG Coding. Giza, Egypt.

Kan, 2005, Digital Audio Watermark Technology Based on Fourier Transform, J. Beijing Broadcast. Ins., 12, 62

Tseng, 2014, Wavelet-Based Watermarking and Compression for ECG Signals with Verification Evaluation, Sensors, 14, 3721, 10.3390/s140203721

ISO/IEC 14496-3:2005/Amd 2: Information Technology-Coding of Audio-Visual object, Part3: Audio Lossless Coding (ALS), New Audio Profiles and BSAC Extensions. Available online: http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=43026.

Dumitrescu, 2012, Greedy Sparse RLS, IEEE Trans. Signal Process., 60, 2194, 10.1109/TSP.2012.2187285

Cho, C.S., Kim, J.W., Shin, H.S., and Choi, B.H. (2010, January 24–26). Implementation of an Object Audio System Based on MPEG-4 Audio Lossless Coding on DSP. Shanghai, China.

Jin, 2003, A Hierarchical Lossless/Lossy Coding System for High Quality Audio up to 192 kHz Sampling 24 Bit Format, IEEE Trans. Consum. Electron., 49, 759, 10.1109/TCE.2003.1233815

Liebchen, T., Reznik, Y., Moriya, T., and Yang, D.T. (2004, January 8–11). MPEG-4 Audio Lossless Coding. Berlin, Germany.

Kamamoto, Y., Harada, N., Moriya, T., Ito, N., Ono, N., Nishimoto, T., and Sagayama, S. (2009, January 25–28). An Efficient Lossless Compression of Multichannel Time-Series Signals by MPEG-4 ALS. Kyoto, Japan.

Kamamoto, 2008, Multichannel linear prediction method compliant with the MPEG-4 ALS, IEICE Trans. Fundament. Electron. Commun. Comput. Sci., E91-A, 756, 10.1093/ietfec/e91-a.3.756

Moriya, T., Harada, N., and Kamamoto, Y. (2006, January 6–8). An enhanced encoder for the MPEG-4 ALS lossless coding standard. San Francisco, CA, USA.

The International Organization for Standardization. Available online: http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=61988.

Koski, 1997, Lossless ECG encoding, Comput. Meth. Programs Biomed., 52, 23, 10.1016/S0169-2607(96)01779-8

Wongsawat, Y., Oraintara, S., Tanaka, T., and Rao, K.R. (2006, January 21–24). Lossless Multichannel EEG Compression. Island of Kos, Greece.

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Sensors

Tập 14 Số 9

17516-17529

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