3
votes
Design of digital filters with negative group delay
Here is another version.
This is a tricky problem. Allpass filters clearly don't work here since the have a strictly monotonic decreasing phase, so the group delay is always positive. That means the ...
- 42.7k
3
votes
Accepted
low shelving filter frequency response diagnosis
Your filter coefficients and your difference equation are wrong. You assumed that the output signal $y[n]$ is fed back to the input, but what is actually fed back is the signal before the multiplier $...
- 89k
2
votes
Accepted
group delay of Bessel filters
The group delay $\tau(\omega)$ of a Bessel filter equals $1/\omega_0$ at $\omega=0$, where $\omega_0$ is the normalization frequency. It is independent of the filter order, unless we choose different ...
- 89k
2
votes
Accepted
Allpass Filter with Sign Switch
In this answer I'll just focus on the given design problem, even though I'm not sure if there might be a better overall solution to your underlying problem.
First of all it's instructive to realize ...
- 89k
1
vote
Design of digital filters with negative group delay
The analog filter you came up with exemplifies the problem that one usually encounters when designing filters with negative group delay in a certain frequency band. The filter with transfer function $...
- 89k
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