09 - 9: FILTERS, ANALYSIS OF PERIODIC SOUNDS A....

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9: Filters - 1 9: F ILTERS , A NALYSIS OF P ERIODIC S OUNDS A. Introduction Some weeks you synthesized (put together) complex periodic signals with harmonic components. It is also possible to analyze (take apart) a complex signal into its component harmonics. You will do this two ways: (1) using a new piece of equipment: the band pass filter (BPF) or (2) Fourier Analysis (next lab). B. Band Pass Filter For the purpose of analysis, the ideal band pass filter would allow only one frequency at a time to pass from the input to the output. Real band pass filters, however, cannot be so precise. They always allow some range, or “band” of frequencies through. A band pass filter is a filter which allows a BAND of frequencies to PASS through it, while filtering out all the others. 1. Measuring band pass filter characteristics It is important to know just how wide the band of frequencies is for the filter you will be using. To find out, use the following procedure: a. Connect the output of your function generator to the filter and to one input on the scope. b. Connect the filter’s scope output to the other scope input. Set the scope to dual trace operation (MODE switch to either ALT or CHOP, whichever looks best) so you can
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09 - 9: FILTERS, ANALYSIS OF PERIODIC SOUNDS A....

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