hnd大二下計(jì)算機(jī)報(bào)告(存儲(chǔ)版)
【正文】 filter. The break frequency is 1/2πRC. Signals of frequency below this are unaffected, while signals of higher frequency are attenuated, as shown in Figure 2.R and C are chosen to give a break frequency of F0= 12πRC10kΩOutput1μFInputFigure 1—Low pass filterGain(dB)LogFrequency BreakFrequencyFigure 2—frequency response of low pass filterSoftware approachA digital filter can achieve the same effect. We need some kind of microprocessor, an A/D converter, and a D/A converter. Many real life applications have these anyway, so there is no additional cost.It turns out that low pass filtering can be done remarkably easily. One method is to generate an output that is just a weighted sum of the input and the previous output, ie:Output = A * previous output + B * input(Proving this formula isn’t so easy.)The constan
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