The digital lock-in technique is used to rather extract the effective signal from the noise and reduce the measurement error.
采用数字锁相技术从噪声中提取有效信号，以减小测量误差。
Two signal processing methods, one based on analog filters, the other based on digital lock-in amplifying technique, are developed and analyzed.
设计了基于模拟滤波器和基于数字锁相放大技术的两种红外气体传感器的信号处理方法。
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