Low pass filter can perform average function?

[OMEsystem]

low pass filter average compare

Why the LPF can perform averaging?
How to analyze this in signal and system aspect?

Thanks,

 

[safwatonline]

lpf average

hello,
average of the signal is its DC, since it is LPF it passes DC and other Low frequency components and blocks the high ones (i.e.makes average).
u can just make simple LPF with a cap. and resistor and find the transfer function , then just get the limits at extreme frequencies.

 

[OMEsystem]

The time constant of LPF is the average time?

 

[electronics_kumar]

if LPF performs averaging means than what is duty of high pass filter ..i mean what kind of signal processing it can do.....

Added after 1 minutes:

similarly, what kind of signal processing does band pass filter and band reject filter can do

 

[llh219]

Maybe, you can think about it.
In Fourier analysis, the dc component of a periodic waveform is equal to its average value.
You can use a LPF to pass the dc term of a signal and reject its higher terms.
A low pass filter can the dc term means that it can get the average value of signal.