function calcule2(){
var i=0; for (i=0;i<= 3;i++) {calcule();}}
function calcule(){
Excel2Html.B6.value=(Math.round((1/(2*3.14*parseFloat(Excel2Html.B4.value)*parseFloat(Excel2Html.C4.value)))* 100))/ 100 ;
Excel2Html.B7.value=(Math.round((parseFloat(Excel2Html.B6.value)/1000)* 100))/ 100 ;
Excel2Html.B8.value=(Math.round((parseFloat(Excel2Html.B6.value)/1000000)* 100))/ 100 ;
}

In extensive signal processing, the use of filter is quite essential. You need to filter the noise from the signal. whether it is a low pass filter or a high pass filter, all requires the tunning of resistance and capacitor values. 
The below calculator will help you find the right cutoff frequency for the signal.
Just put the value of R and C and the result will be shown.

Resistance ( Ω ) Capacitor ( F )
Result
Hz
KHz
MHz


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