以下为句子列表：
英文: It also gives a safety design problem analysis using an electret capacitor microphone to pick-up the heart sound signals.
中文: 该电路涉及到放大、滤波、电平抬升等电路,并给出了安全设计问题,利用驻极体电容传声器来拾取心音信号。
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英文: A monitoring system based on the relationship between cardiac contractility and heart sound was developed.
中文: 研究了基于心力—心音关系的心脏储备无创监测系统。
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英文: Studies on the comparison of normal and abnormal heart sound signals
中文: 正常与异常心音信号比较研究
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英文: BISPECTRAL ANALYSIS OF HEART SOUND SIGNALS VIA NON-GAUSSIAN AR MODEL
中文: 心音信号的非高斯AR模型双谱分析
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英文: Time-frequency analysis of the first heart sound based on the hilbert-huang transform
中文: 基于Hilbert-Huang变换的第一心音信号时频分析
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