工科电子类文章中译英英语翻译（滤波器）100分

3filterperformanceverification

UsingAltera'sCycloneseriesofEP1C6Q240C8chip,designeda32-orderFIRfiltersystemofvariableparameters,compiledon-chiplogiccellsoccupy75%ofoccupiedRAM71%.Usingthesignalgeneratorproducesavarietyofinputsignals,thecomputeraccordingtothegivenfilterindicatorsderivethefirst-orderfactor,andthenFPGAconfiguration;FPGAandthenfilteredthedatauploadedtothecomputerdisplay.

Specificexperimentsandanalyzedasfollows:

(1)filterindicators:WindowfunctionforKaiserwindow,β=3.4,samplingfrequencyof187.5kHz,cut-offfrequencyof35kHz,filteramplitude-frequencycharacteristicandphase-frequencycharacteristicasshowninFigure13;inputsignalis1.5kHz,and10kHzsinewavemixed-signal,oscilloscopesignalinFigure14a)shows,thefilteredsignalinFigure14b)below.FromFigure14b)canbeseen,sincethelow-passfiltercutofffrequencyof35kHz,theinputofthemixed-signalfrequencyarelowerthan35kHz,sothefilteredsignalwaveformhasnotchanged.

(2)filterindicatorsand(1)thesameinputsignalis1.5kHzand50kHzsinewavemixed-signal,oscilloscopesignalinFigure15a)shows,thefilteredsignalinFigure15b)asshown.Theresultscanbeseenthatthelow-passfiltercutofffrequencyof50kHzwouldbegreaterthanthesinewavesignalfilteredout,thebasicretained1.5kHzsinewavesignal.

(3)filterindicators:windowfunctionisHammingwindow,thesamplingfrequencyof187.5kHz,cut-offfrequencyof5kHz,filtercharacteristicsasshowninFigure16;inputsignalis1kHzsinewaveandwhitenoisemixed-signal,oscilloscopesignalshowninFigure17a)shows,thefilteredsignalinFigure17b)below.Aftertheresultscanbeseenfromthefilter,filtertofilteroutalotofwhitenoise,basicallyresumed1kHzsinewavesignal.

(4)filterindicators:WindowfunctionforKaiserwindow,β=3.4,samplingfrequencyof187.5kHz,pass-bandfrequency10kHz~15kHz,filtercharacteristicsasshowninFigure18;inputsignalis27kHz,and10kHzsinewavemixed-signal,oscilloscopesignalinFigure19a)shows,thefiltereddatashowninFigure19b)below.Throughthefilteredimagecanbeseenthattheband-passfilterwillbeoutsidethepass-bandfrequency27kHzsinewavesignalfilteredout,andbasicallyrestored10kHzsinewavesignal.

(5)filterindicators:Filterindicatorand(4)thesame;inputsignalis1kHzand10kHzsinewavemixed-signal,oscilloscopesignalinFigure20a)below.AfterfilteringthedatashowninFigure20b)below.ThroughFigure20b)canbeseenthattheband-passfilterwillbelowerthanoutsidethepass-bandfrequencyof1kHzsinewavesignalfilteredout,andbasicallyretainedthe10kHzsinewavesignal.

Theabovefilterperformancetestingexperiments.Throughexperiments(1)and(2)tovalidatetheperformanceofthefilterlow-passfiltering.Throughexperiments(3)tovalidatethefiltertofilterout