Howtosignalprocessing
- Which filter should one use to get a constant group delay?
- What is the group delay of a filter?
- What does group delay tell you?
- How do you calculate group delay of a filter?
Which filter should one use to get a constant group delay?
By far the most common applications for FIR filters are linear phase FIR filters because of the benefit of constant group delay which is the result of linear phase.
What is the group delay of a filter?
Group delay in a filter is the time delay of the signal through the device under test as a function of frequency. If we take the example of a modulated sine wave, for example an AM radio signal. Group delay is a measurement of the time taken by the modulated signal to get through the system.
What does group delay tell you?
The so-called “group delay” is simply the time lag between the envelope of input burst and the envelope of the amplitude of the output burst. So, group delay means a propagation delay through a filter, measured on the envelope of the signal.
How do you calculate group delay of a filter?
M(ω)•ejΦ(ω) = H(ω) = the DTFT of h(n) –d[Φ(ω)]/dω = group delay of the filter.
