What is Refiltering?

Refiltering is the process of applying a filter to a signal that has already been filtered. In other words, it is the act of filtering a signal that has already been processed by another filter.

For example, if you apply a low-pass filter to a signal and then apply a high-pass filter to the same signal, the high-pass filter is refiltering the signal that has already been low-pass filtered.

Refiltering can be useful in certain situations, such as when you want to remove high frequencies from a signal that has already been filtered to remove low frequencies. However, it can also cause problems, such as amplifying noise or introducing distortion, so it is important to use refiltering carefully and with caution.

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