New answers tagged filter-design
3
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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 ...
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1
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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
0
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Resolution after Oversampling, Filtering-Decimation
You don't know enough.
There's two absurd extremes: first, you could have an ADC that has no thermal noise at all, but distortion that's 108.51dB below the ADC's full-scale input range; second, you ...
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0
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Resolution after Oversampling, Filtering-Decimation
Your calculations are correct. Of course using an over-sampling factor of 256 will reduce the bandwidth of your converter by the same amount. Note that oversampling only improves the SNR if the ADC ...
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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
0
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Basic tools for digital filter design?
There are also some interesting on-line tools that can be used to design the filter and obtain the filter coefficients. These can be copy-pasted to the code and then be used to implement the desired ...
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0
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How to design IIR digital filters?
Despite previous commenters decrying the design method, I found an interesting online tool at https://www.micromodeler.com which satisfies the questioner's requirement of manual placement of poles &...
0
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Accepted
Problem by designing and filtering a Bessel-Thomson filter in Python
You can approximate or simulate an analog signal, but it lives inside your computer, so by definition is digital.
You can only filter a digital signal using a digital filter. If you’re only interested ...
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2
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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
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