signal extract的用法和樣例：
例句
- Then after amplitude limiting, to be preamplified, demodulated, bandpass filtered, the doppler frequency shift signal is extracted.
經過限幅保護，接收放大，檢波和帶通濾波后，將多普勒頻移信號提取出來。 - Then we study the methods of image analysis and data analysis in order to extract the hybridizing intensity and retrieve the biological information.
然後從圖像分析和數據分析兩方面研究了影響晶元分析的因素，實現了對雜交熒光圖像的信號提取和基本的生物信息分析。
