The design of digital filters is a deceptively complex topic.
However, digital filters do introduce a higher fundamental latency to the system.
Another form of a digital filter is that of a state-space model.
Then the digital filter removes the unwanted high frequency content.
China's digital filters, in other words, blocked them before the page could get back to me.
Many digital filters are designed to give low-pass characteristics.
Common examples of linear time-invariant systems are most electronic and digital filters.
With the availability of digital signal processing, active digital filters have become common.
Perfectionists, though, consider the shift to digital filters an important factor in current audio design.
There are digital filters which can be used to filter things besides frequencies.