Chao Chun-Tang, Maneetien Nopadon, Wang Chi-Jo, Chiou Juing-Shian
Department of Electrical Engineering, Southern Taiwan University of Science and Technology, No. 1 Nan-Tai Street, Yong Kung District, Tainan 71005, Taiwan.
ScientificWorldJournal. 2014 Mar 25;2014:587238. doi: 10.1155/2014/587238. eCollection 2014.
This paper presents the design and evaluation of the hardware circuit for electronic stethoscopes with heart sound cancellation capabilities using field programmable gate arrays (FPGAs). The adaptive line enhancer (ALE) was adopted as the filtering methodology to reduce heart sound attributes from the breath sounds obtained via the electronic stethoscope pickup. FPGAs were utilized to implement the ALE functions in hardware to achieve near real-time breath sound processing. We believe that such an implementation is unprecedented and crucial toward a truly useful, standalone medical device in outpatient clinic settings. The implementation evaluation with one Altera cyclone II-EP2C70F89 shows that the proposed ALE used 45% resources of the chip. Experiments with the proposed prototype were made using DE2-70 emulation board with recorded body signals obtained from online medical archives. Clear suppressions were observed in our experiments from both the frequency domain and time domain perspectives.
本文介绍了一种使用现场可编程门阵列（FPGA）设计和评估具有心音消除功能的电子听诊器硬件电路。采用自适应线增强器（ALE）作为滤波方法，以减少通过电子听诊器拾音器获取的呼吸音中的心音成分。利用FPGA在硬件中实现ALE功能，以实现近实时的呼吸音处理。我们认为，这种实现方式是前所未有的，对于门诊环境中真正有用的独立医疗设备至关重要。使用一个Altera cyclone II-EP2C70F89进行的实现评估表明，所提出的ALE使用了芯片45%的资源。使用DE2-70仿真板对所提出的原型进行了实验，该仿真板带有从在线医学档案中获取的记录身体信号。在我们的实验中，从频域和时域角度都观察到了明显的抑制效果。
