Howtosignalprocessing
- What is acceptable for group delay?
- How do you calculate group delay of a filter?
- How do you compensate filter delay?
- What is the difference between phase delay and group delay?
What is acceptable for group delay?
1 kHz and above – anything less than 2 ms is good. 200 Hz – 1000 Hz – less than 4 ms. Under 200 Hz – Expect higher numbers. Even 30-40 ms for the very low frequencies.
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.
How do you compensate filter delay?
When the shift is constant, you can correct for the delay by shifting the signal in time. Sometimes the filter delays some frequency components more than others. This phenomenon is called phase distortion. To compensate for this effect, you can perform zero-phase filtering using the filtfilt function.
What is the difference between phase delay and group delay?
A signal can contain multiple sinusoidal components. The time delay of amplitude envelopes of these sinusoidal components is called group delay, whereas, The time delay of phase of various sinusoidal components present in a signal is called Phase delay.
