Hi guys!
I have one simple question. If I design a filter circuit for a sine wave signal, is it possible for the same filter circuit to be implemented for different type of signals (for example square wave, ping, etc)? The signal have the same frequency and used in the same environment. If yes, what are the reasons? If no, why?
Filters typically have a defined frequency response and are classified as low-pass, high-pass, band-pass or band-stop accordingly. They also have a cut-off frequency (or 2), roll-off and ripple characteristics defined.
Next you need to think about the nature of the input wave forms - and it is easiest to think of these in the frequency domain. A sine wave as a single frequency. A square wave has a fundamental frequency plus a whole lot of harmonics that decrease in amplitude as the frequency increases. (If by 'ping' you mean a single pulse, then think of a square wave and add a lot more harmonics.)
Now put the two concepts I've mentioned together: the filter will reduce individual frequencies that are outside the pass band with increasing reduction the further you get outside the band.
Therefore, what you get out will depend on the questions that Klaus has asked.
Susan
Thank you for your reply. Actually, i would like to design and simulate (before implementation) a signal conditioning circuit for a ping signal with freq of 28 kHz. Consider this ping is produced by an underwater pinger. Now I have to retrieved this signal through a sensor (a hydrophone). Since this signal is corrupted by noises, a suitable filter (maybe band-pass filter) is necessary to filter out the noise so that a clean signal could be obtained. So, i'm not really sure how to generate a noisy signal in Proteus to represents the ping signal. Any suggestion is very appreciated.