Abstract
The fast digital lock-in amplifier (FDLIA) realizes the detection of signal amplitude and phase at a high speed, but the signal in odd harmonic will interfere with the algorithm. In order to improve the defects of the FDLIA and enhance its practicability, in this paper, moving average filters with different lengths are set for each uncorrelated interference, which can effectively suppress each interference and its related interferences through addition operation. When other interferences of one channel signal are suppressed, its data can be continuously used for signal processing of other channels, keeping the efficiency of FDLIA. Simulated and practical experiments show this method can almost completely suppress channel interference, which provides a scheme for high-speed and high-precision detection of multi-channel signals.
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