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本文在扼要介绍电子心脑功能仪的基础上，对其电子学线路的关键部分——定位电路作了详细的分析，并给出一种实用的高速对数变换器。
Based on the brief introduction of the electronic cardio-brain function instrument, this paper gives a detailed analysis of the key part of its electronic circuit - the positioning circuit, and presents a practical high-speed logarithmic converter.