# filters's questions - English 1answer

1.724 filters questions.

### 4 Deconvolution by Convolution

This is now a second time I am attempting to ask this very important but simple question here. What I want to know is can you do deconvolution by convolving a signal. It is often stated that, for ...

### Explanation of fundamental filtering's consequences on signal

Can anyone explain why exactly an "Overshooting" phenomena is observed when the fundamental harmonic is removed as seen on the figures? Is it technically right to call this "overshooting" at all ? If ...

### How to make sinewives with array input, for-loop functions and operate array with others [matlab]? [on hold]

Thanks to previous question, I got some clues to resolve this one. But, I still get some problems here. ...

### Filtering White Noise to Generate Harmonic Signal

I have studied convolutions and filters a long time ago. Today, I am trying to review the basics using some notes of mine, but I am finding difficult to solve easy problems. Since I don't have ...

### How do we use signal::filter and signal::butter in R for EEG data?

1 answers, 1.335 views filters signal-analysis filtering bandpass eeg
I am trying to design an experiment to determine the peak amplitude of an EEG signal in response to a stimulus. Till now, our team has been using MATLAB and since we wish to go open source, we are ...

### Detect gradual increase then decrease in slightly noisy data

2 answers, 16 views filters noise python pattern
I have data thats not too noisy and I am trying to detect a pattern where it gradually increases then decreases in a short period of time (20 ticks? it should be roughly similar per session but can ...

### How to set a Carrier Wave for DBPSK Modulators in gnuradio?

for a Project I need to build an Audio Modem in GNU Radio. I decided, that it would be the best to use DBPSK Modulation, because that is fast and relatively noise resistant. But as it seems, the ...

### Homomorphic image filter source code has no or minimal effect

0 answers, 17 views filters c#
Take a look at this link. ...

### 2 Introductory resources to mathematical properties of “dynamically recalculable” filters in audio/musical equalizers?

1 answers, 68 views filters audio reference-request
Introductory resources to mathematical properties of "dynamically recalculable" filters in audio/musical equalizers? Particularly, I want to understand What mathematical features (e.g. monotonicity ...

### How can a RLS algorithm utilise Wiener filter as FIR (M-tap) block?

I'm currently working with a dataset of $5000$ pulses of $N=15000$ samples each. I managed to implement the RLS algorithms with a FIR M-Tap filter such that $M\leq 15000$ ($150$ seems to achieve the ...

### low pass filter in fft

1 answers, 254 views fft filters
I have signal. I do Fast Fourier transform on it and now I have this output. I want to delete the other except two that have high altitude. Can you help me ? My f sample is 2500. My complete time ...

### 1 What is the difference between the sampling frequency of signal and sampling frequency of filter

I believe that there is no connection between the sampling frequency used for converting an analogue filter to digital filter and the one used to sample a signal that the filter will be used on. But I ...

### Create a third octave spectrum from a time signal

I have to create a third-octave spectrum from a time signal on Octave GNU. I found some code on the net to help me but I don't have all the parts of the algorithm. I have a .csv file which contains ...

### reconstructing time-stretched signals for filtering purposes

1 answers, 40 views matlab filters python
I would like to know if it's possible to reconstruct the original time domain signal from it's time-stretched version? Is there any algorithm out there that can do this? Python, Matlab, etc? I want ...

### 13 Which IIR filters approximate a Gaussian filter?

2 answers, 4.339 views filters filter-design gaussian
So it recently dawned on me that Bessel filters, despite being listed along with the other common types, are really an oddball that belongs in a different "class", and I'm trying to learn more about ...

### 1 Derivation of Bessel filters

1 answers, 319 views filters filter-design proof
I was reading Winder's Analog and Digital Filter Design and the section on Bessel filter. I was hoping to see a complete derivation of the Bessel filter theory, but Winder's book gives only \begin{...

### 3 A few conceptual questions about filter, pole, and bilinear

I am working on a school project on converting a 6th order butterworth high pass filter to digital filter using bilinear transformation. Just got a couple conceptual questions need to be clarified ...

### 1 FIR Filter Design - input parameters conversion

I am new to DSP and filter design. I have developed a code in C++ to calculate FIR coefficients using Parks-McClellan algorithm. The inputs to calculations are: Filter type (Low-Pass, High-Pass) ...

### Designing butterworth filter with pole placement

1 answers, 205 views filters filter-design butterworth
I am trying to design a Nth order continous time Butterworth filter in state space, with pole placement technique. ...

### Remove artefact in signal, and then look at the PSD?

0 answers, 15 views filters power-spectral-density eeg
To note, I am using Matlab R2017a for my signal processing. I have filtered my EEG signal according to the frequencies I am interested in using butterworth (2Hz-30Hz). But there are some large ...

### How do I show an impulse response leads to a zero-phase frequency response?

2 answers, 54 views filters impulse-response linear-phase
I'm trying to understand how to show that with real coefficients, the phase response of a filter is 0. Here is the impulse response $h[n] = b_1d[n+1] + b_0d[n] + b_1d[n-1]$ How should I approach ...

### Filtering odd and even frequencies

1 answers, 236 views fft filters