What is the difference between a system and a filter in signal processing?

[timlee]

Hi,
In the context of signal processing, I am curious about what's the relation and difference between system and filter? Are they the same?

Thanks and regards!

 

[dsprao]

Yes Dear, a system in DSP can be a filter, and a filter can be use for different types of processing of signal in digital domain. A filter is always represented by a system function in z-transform. Some filters can be just anti-aliasing, while some can be differentiators or integrators. I think it is clear now.