Takahashi K, Yamazaki Y
Department of Electronic Engineering, Faculty of Engineering, Saitama University, Japan.
Front Med Biol Eng. 1992;4(4):291-9.
To realize a digital recorder capable of long-time recording of electrocardiograms (ECGs) in IC memories, the methods of data compression were studied and the accuracy of reconstructed ECGs from the compressed ones was evaluated. Concretely, the variant of MSAPA was used as a data compression algorithm in order to store ECGs in IC memories for 12-24 h. The fabricated digital recorder used an 8 bit CPU with the function of data compression and was capable of operating in real time at a sampling rate of 200 Hz. With bit compression, 24 samples of American Heart Association ECGs were compressed to an average value of 16.8% under the condition of an error limit of 30 microV (120 microV in QRS); the average maximum recording time in 1 Mbyte IC memories was 8.5 h. In a comparison of the reproduction accuracy and errors produced by a small analog tape recorder with those produced by the digital method, the digital system was shown to be superior to the analog system.
为了实现一种能够在集成电路存储器中长时间记录心电图（ECG）的数字记录器，研究了数据压缩方法，并评估了从压缩后的心电图重建的准确性。具体而言，使用MSAPA变体作为数据压缩算法，以便将心电图存储在集成电路存储器中12至24小时。制造的数字记录器使用具有数据压缩功能的8位CPU，能够以200Hz的采样率实时运行。通过位压缩，在误差极限为30微伏（QRS波中为120微伏）的条件下，美国心脏协会的24个心电图样本被压缩到平均值的16.8%；在1MB的集成电路存储器中，平均最大记录时间为8.5小时。在比较小型模拟磁带记录器和数字方法产生的再现准确性和误差时，数字系统被证明优于模拟系统。
