What happens if I put a signal with an interference signal through a low pass filter?

[fhedri]

What happens if I put a signal along with an interference signal through a low pass filter of rolloff -40dB/decade?

 

[abaidullah]

Re: Low pass filter

both signals will get attanuated

 

[kelvin_sg]

Re: Low pass filter

both signals will get attanuated

Both signal might get attenuated. Depending on the frequcency of the signals and
the passband of the LPF.

 

[Kral]

Re: Low pass filter

fhedri,
It depends on the frequencies of the signal and the interference. Just evaluate the transfer function, replacing s with jw. This will give you the gain and phase at any frequency. If the interference signal is non-sinusoidal, you can do a Fourier analysis of the interfernece signal, and compute the gain at each frequency. The RMS output of the filter will be the square root of the sum of squares of the individual frequency components.
Regards,
Kral