随着微电子技术和信号处理技术的发展，在工程测试中，数字信号处理方法得到广泛的应用。

从传感器获取的信号大多为模拟信号，进行数字信号处理之前，一般先要对信号作预处理和数字化处理。

而数字传感器可直接通过接口与计算机联接，将数字信号送给计算机（或数字信号处理器）进行处理。

数字信号处理系统：

1、预处理(Preprocess)

在数字处理之前，对信号用模拟方法进行的处理。

如对输入信号的幅值处理，使幅值与A / D转换器的动态范围相适应；衰减信号中不感兴趣的高频部分，减少频混的影响；隔离被分析信号中的直流分量，消除趋势项及直流分量。

2、A / D转换：将预处理以后的模拟信号变为数字信号，存入指定的地方。A/D转换过程包括采样、量化和编码三个步骤。

3、分析计算：对采集到的数字信号进行分析、计算

（可用数字运算器件组成的信号处理器，也可用通用计算机）。

4. 结果显示：一般采用数据和图形显示结果。

英文翻译

With the development of microelectronics technology and signal processing technology, digital signal processing methods have been widely used in engineering tests. The signals obtained from the sensors are mostly analog signals.

Before digital signal processing, the signal must be preprocessed and digitized. The digital sensor can be directly connected to the computer through the interface, and the digital signal is sent to the computer (or digital signal processor) for processing.

Digital signal processing system:

1. Preprocess

Before digital processing, the signal is processed by analog methods.

Such as processing the amplitude of the input signal to adapt the amplitude to the dynamic range of the A/D converter; attenuate the uninteresting high-frequency part of the signal to reduce the influence of frequency mixing; isolate the DC component in the analyzed signal and eliminate Trend term and DC component.

2. A/D conversion: convert the preprocessed analog signal into a digital signal and store it in a designated place. The A/D conversion process includes three steps of sampling, quantization and coding.

3. Analysis and calculation: Analyze and calculate the collected digital signals

(signal processors composed of digital computing devices or general-purpose computers can also be used).

4. Result display: generally use data and graphics to display the results.

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参考资料：郑佳老师的《测试技术》课程PPT；

英文翻译来源于Google翻译；