Electronics > Beginners
Bandpass Filter Design
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Nitrousoxide:

--- Quote from: LvW on May 10, 2018, 08:41:40 am ---"zero-phase filters" ...please, can you give some explanation about the meaning of this expression? (Non-inverting bandpass?)

--- End quote ---

All filters have an associated phase response. Analog filters, or filters implemented in the continuous time domain have non-linear phase, it is a product of topologies and the nature of capacitive and inductive elements. Filters that are implemented in the digital domain, depending on the design and implementation technique (A large topic, ask if you want to know more) a filter may have a linear (FIR) or a non-linear phase (IIR).

However, focusing on FIR filters for this example. Their usual topology consists of summed, weighted delay elements (convolution). This will introduce a delay of N filter taps (or coefficients). Zero phase filtering corrects for this, shifting the signal back by N samples.

So it can be said that a zero phase filter is a linear phase filter with a phase slope of 0, this can only be done in the digital domain.
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