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在数据采集系统中 ,对带宽为fa 的模拟信号 ,采样率必须满足fs>2fa 的要求 ,否则将产生混叠 (Alias ing)现象。在采样前的去混叠滤波器必须满足频带及动态两方面的要求 ,当系统的动态范围很大时 ,已很难再使用模拟滤波器。由于近来数字信号处理器 (DSP)技术的进步 ,一种将过采样及抽取的概念引入数据采集系统的设计已取得成功。文章以实例论述了DSP技术在井间地震多采样率系统中的应用
In the data acquisition system, the sampling rate must meet the requirements of fs> 2fa for the analog signal with the fa bandwidth. Otherwise, aliasing will occur. Before sampling, the de-aliasing filter must meet both band and dynamic requirements. It is very difficult to use the analog filter when the dynamic range of the system is very large. Due to recent advances in digital signal processor (DSP) technology, a design that introduces oversampling and decimation concepts into data acquisition systems has been successful. The article discusses the application of DSP technology in multichannel earthquakes with multi-sampling rate