High-performance data acquisition is needed in some high speed and high precision measurements when signal measurements, image manipulation and audio frequencysignal process are taken.
在信号测量、图像处理、音频信号处理等一些高速、高精度的测量中，都需要进行高性能数据采集。
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Wavelet analysis is widely used in digital signal and image fields because of its good time frequency localization feature, but it doesn't do well in timely processing of long signals.
With the signalfrequency known, the filter with a given frequency delay is designed for an image target detection. The experiment proves that the filtering effect is good.