Square to Sine wave

289

05:47:27

It is possible to create a sin wave if given a square wave.  You see, mathematically any waveform can be made of of an infinite amount of smaller sin waves.

If we feed the wave though a low pass filter tuned to the frequency of the square wave, we can get a sin wave back out.  The problem we face now is filters, at least the simple ones, don't have a sharp dropoff, so some of the harmonics get through.

We can fix that by using a series of LPFs, because the dropoff increases with each additional filter.

published 12 years ago

thebugger

12 years ago

Yeah but this kind of filtering is passive and after a few filters you get nothing due to the inherent attenuation of every filter. You should add to the description the difference between active and passive filters

Puffie40

12 years ago

That's a good point, but I'm still a little shakey over how active filters work.

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