New answers tagged filter-design
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 ...
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 $...
0
votes
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 ...
0
votes
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 ...
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 $...
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
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 ...
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Related Tags
filter-design × 1224filters × 567
finite-impulse-response × 210
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infinite-impulse-response × 160
digital-filters × 143
discrete-signals × 97
signal-analysis × 77
bandpass × 65
python × 57
frequency-response × 56
audio × 42
butterworth × 41
fft × 38
highpass-filter × 37
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filtering × 34
phase × 32
transfer-function × 32
frequency-spectrum × 30
convolution × 23
poles-zeros × 22
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