Question

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在模拟输入信号的采集过程中，由于经常受外界环境、系统噪声等的干扰影响，造成数据采集的精度降低，不能如实地反映被测对象的真实情况。要提高采集数据的精度，使干扰的影响降到最低，一方面从硬件方面加以改进，如选择品质优良的传感器，给采集系统前向通道设计滤波电路，进行频率滤波。另一方面，通过CPU的控制，选取一定的算法， 通过程序的方法也可以实现频率滤波，完成模拟滤波器类似的功能，这就是软件滤波，也叫数字滤波。
数字滤波就是在数字信号输入之前, 用数字计算的方法来实现对数字信号的处理, 将一组输入的数字序列转化为一组输出的数字序列, 使信号频率范围内的信息被通过, 而其他频率范围的信息被阻止。从而达到增强信号, 压低干扰, 把信号和干扰分开, 提取有用的信息的目的。数字滤波的过程, 实际上就是采用数字系统实现一种运算的过程, 与一般的模拟滤波器相比, 它具有可靠性高、精度高、灵活性高的优点。数字滤波方法有很多, 滤波效果也各异, 有些方法效果很好, 但算法复杂, 很难应用于实时系统。本文介绍几种常用的数字滤波方法,并对它们在实时系统中的应用进行分析和比较。
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Answer 1

In the process of imitating importation collect of signal in, because of usually being subjected to the interference of the external world environment, system Zao voice...etc. influence result in the accuracy that the data collect lower, can't such as on-the-spot reflection is measured object of true circumstance.Want to raise accuracy of collect the data, make the influence of interference decline to lowest, on the other hand take into improvement from the hardware, such as choice the spread of good quality feeling machine, give before collecting system to passage design filter an electric circuit, carry on frequency to filter wave.Pass CPU on the other hand of control, selection certain of calculate way, the method which pass procedure can also realization the frequency filter wave, completion imitate filter similar of function, this is the software to filter wave, also call numeral filter wave.
Numeral filter wave be at numeral signal importation before, use numeral calculation of method to realization logarithms word signal of processing, will a set of importation of numeral sequence conversion is a set of output's numeral sequence, make information in the scope of the signal frequency pass, but the information of other frequency scope drive arrestment.Attain to strengthen signal thus, depress interference, separate signal and interference, withdraw the purpose of useful information.Numeral filter the process of wave, actually be an adoption numeral system realization a kind of process for operate, with general of imitate the filter compare, it have credibility Gao, accuracy Gao, vivid sex Gao of advantage.The numeral filter a method to have a lot and filter an effect each difference also, some method be effective, but calculate way complications, very difficult application in solid system.This text introduction is a few in common use of the numeral filter a method, and to they are in solidly the hour the system of application carry on analysis and comparison.

Answer 2

In simulator input gathering process, because receives the external environment, the system noise frequently and so on disturbing effect, causes the data acquisition the precision to reduce, cannot reflect truthfully is measured the object the real situation. Must enhance the gathering data the precision, causes the disturbance the influence to fall to lowly, on the one hand improves from the hardware aspect, if chooses the excellent in quality sensor, for the gathering system forward channel design filter circuit, carries on the frequency filtering. On the other hand, through the CPU control, selects certain algorithm, may also realize the frequency filtering through the procedure method, completes the analog filter similar function, this is the software filter, is also called the digital filtering. the digital filtering is before the digital signal input, realizes with digital computation's method to digital signal processing, inputs the digital sequence transformation a group is the digital sequence which a group outputs, enables in the signaling frequency scope the information to pass, but other frequency range's information is prevented. Thus achieves the enhancement signal, pulls down the disturbance, separates the signal and the disturbance, withdraws the useful information the goal. Digital filtering's process, in fact is uses the number system to realize one kind of operation process, compares with the general analog filter, it has the reliability to be high, the precision is high, flexible high merit. The digital filtering method has many, the filter effect also varies, some method effect is very good, but the algorithm is complex, very difficult to apply in the real time system. This article introduced that several commonly used digital filtering method, and carries on the analysis and the comparison to them in real time system's application

好了

Answer 3

In simulator input gathering process, because receives the external environment, the system noise frequently and so on disturbing effect, causes the data acquisition the precision to reduce, cannot reflect truthfully is measured the object the real situation. Must enhance the gathering data the precision, causes the disturbance the influence to fall to lowly, on the one hand improves from the hardware aspect, if chooses the excellent in quality sensor, for the gathering system forward channel design filter circuit, carries on the frequency filtering. On the other hand, through the CPU control, selects certain algorithm, may also realize the frequency filtering through the procedure method, completes the analog filter similar function, this is the software filter, is also called the digital filtering. the digital filtering is before the digital signal input, realizes with digital computation's method to digital signal processing, inputs the digital sequence transformation a group is the digital sequence which a group outputs, enables in the signaling frequency scope the information to pass, but other frequency range's information is prevented. Thus achieves the enhancement signal, pulls down the disturbance, separates the signal and the disturbance, withdraws the useful information the goal. Digital filtering's process, in fact is uses the number system to realize one kind of operation process, compares with the general analog filter, it has the reliability to be high, the precision is high, flexible high merit. The digital filtering method has many, the filter effect also varies, some method effect is very good, but the algorithm is complex, very difficult to apply in the real time system. This article introduced that several commonly used digital filtering method, and carries on the analysis and the comparison to them in real time system's application

Answer 4

Analog input signal in the acquisition process, because often the external environment, the system noise and other interference effects, resulting in reduced accuracy of the data collection, can not be measured accurately reflect the real situation of objects. To improve the accuracy of data collected so that the impact of interference to a minimum, on the one hand from hardware to be improved, such as the choice of good quality sensors, to the collection system prior to the channel filter circuit design, frequency filtering. On the other hand, controlled by the CPU, select certain algorithms, through procedural methods can also achieve frequency filtering, analog filters to complete a similar function, and this is filtering software, also called digital filtering.
Digital filtering is in the digital signal input, using figures calculated approach to the realization of digital signal processing, will enter a sequence of numbers into a group of output figures sequence, so that the signal frequency range of information was passed and the other Frequency range of information was blocked. To achieve enhanced signal, to suppress interference, and interference from the signal, extract useful information for the purpose. Digital filtering process is, in fact, a digital system to achieve a computing process, and general analog filters compared it with high reliability, high precision and high flexibility of the merits. There are many digital filter, filter effects vary, some method is very good, but complex algorithms, it is difficult to apply real-time system. This article introduces several commonly used digital filtering methods and their application in real-time system for analysis and comparison.