Questions tagged [filter-design]
Fiter design is the process of designing a filter.
932
questions
0
votes
2answers
38 views
Pre-Warping is not working on bilinear transform
New here and I just wanna ask the question of what happens when your pre warping doesnt work on your bilinear transform?
I am assuming my isnt working as part of my research I have read that the ...
0
votes
1answer
25 views
How to simulate a signal of a particular frequency according to the number of points in a period of the signal?
I have one period data ($n$ points in total) of a signal. I want to generate a periodic signal with a total of $m$ points and corresponding signal frequency of $F$ according to this data. How do I do ...
-1
votes
0answers
21 views
Low-pass filter on PDM data provides data that does not have a FFT
I'm trying to convert PDM data into analog form by passing the data through a low-pass filter in Matlab. My approach is fairly simple and matches the answer given in this Electrical Engineering Stack ...
1
vote
2answers
27 views
Finding the coefficients of the block diagram
I was looking at the question from a textbook of mine and it doesn't make too much sense to me:
Design a first-order filter, linearly extrapolating the current and
previous measurement. This is ...
0
votes
1answer
81 views
the number of multiplications per second required by the system
Q1. Consider a system implementing a rational sampling rate change by 5/7: for this, we cascade upsampler by 5, a lowpass filter with cutoff frequency π/7 and a downsampler by 7. The lowpass filter is ...
1
vote
0answers
23 views
Number of multiplication operations needed in rational sampling rate change with IIR Butterworth filters
I am trying to get a general sense of how many multiplication operations are needed for a 4th-order Butterworth filter (IIR filter) with a rational sampling rate change. I am excluding any ...
0
votes
0answers
31 views
Kalman Filter: Difference between sensor input and control input
I recently saw a matlab sensor fusion example which combined IMU and GPS data for drone localization.
What was surprising about it was that the IMU was used to predict future behavior of the system as ...
2
votes
1answer
84 views
What are the advantages and disadvantages of Kalman filter compared with FIR, IIR and low pass filter to filter data with noise?
It is known that the Kalman filter can filter the data with noise. I also find it works well after using it compared with FIR, low pass filter,etc. Now, I have a couple of questions about the ...
0
votes
0answers
34 views
Signal processing on hourly atmospheric temperature, wind speed and humidity data for solar panel maintenance
I am working on a machine learning problem, where i have to predict if a device connected with solar panel at a specific block has been damaged. I have many factors to consider, out of which ...
1
vote
1answer
41 views
How to implement a series of second-order, digital state-variable filters in MATLAB?
How to implement a series of second-order, digital state-variable filters, using the high-pass output from each section to effect the low-pass to high-pass transformation in MATLAB?
Hello, I am trying ...
1
vote
2answers
50 views
How can we measure the quality of the FIR filter?
The process of designing filters includes too many parameters like bandwidth, transition, degree of attenuation in side-bands, phase delay, causality, the magnitude of ripples, and so on. First of all,...
1
vote
1answer
57 views
IIR filter relationship between number of poles, order and second order sections
I have ported Iowa Hills Code Kit to a mcu to calculate IIR filter coefficients. They are used to initialize the CMSIS Biquad Cascade IIR Filters Using a Direct Form II Transposed Structure.
Trying to ...
0
votes
0answers
24 views
Interpolationg phase and magnitudes, Transformation function
I am trying to filter signal x(n), n = 150. I made a filter with few frequency points on the x axis , [-11., -9., -3., -2., -1., 1., 2., 3., 9., 11.])
...
0
votes
1answer
40 views
Decoder implementation
Im struggling to implement / build convolutional decoder .
I've done implementation of FEC encoder which it's as shown in the photo below:
So this is the encoder that I've implemented, and I want to ...
1
vote
1answer
43 views
What is the best way of filtering EEG signal for the specific frequency band?
I have an EEG data with a sampling rate is 500 Hz. Actually, there are too many ways to filter EEG signals. However, the abundance of options is not valid for me. I have to use a causal, linear-phase ...
0
votes
2answers
52 views
0
votes
1answer
39 views
How does window length influence cut-off frequency of filter and group delay?
I'm attempting to interpret the following function. To my understanding, this aims to implement an FIR low-pass filter with a Nuttall window. Then, it filters the signal by a simple application of the ...
0
votes
1answer
28 views
Design of Parks-McClellan Lowpass Filter
Can we design Parks-McClellan Lowpass Filter with only sampling frequency of 12KHz and cutoff frequency of 4KHz and order of 30? I went through Matlab help, where we need parameter like passband ...
0
votes
1answer
39 views
How to find minimum length of a FIR symmetric filter if I am given DTFT
I am practising for upcoming exams and came across this question.
Let $h[n]$ be an FIR filter such that $h[n] = 0$ when $|n| > M$ and $h[n] = h[−n]$. A plot of $H(e^{j\omega})$ (DTFT of $h[n]$) is ...
1
vote
1answer
33 views
Filtering artefacts and filtering short signals
I have a signal from EEG sensors and I try to denoise it from AC frequencies. For that reason, I estimated PSD of my signal and found that 50 Hz and 100 Hz are likely to represent noise. I constructed ...
1
vote
1answer
49 views
Resampling FIR coefficients
I have received from a client a 32-coefficient FIR filter running at 1 kHz. I would like to adapt the filter to a 24-coefficient FIR filter running at 750 Hz while preserving the 0-375 Hz frequency ...
4
votes
1answer
164 views
Digital filter coefficients from low-pass to high-pass
Given I have coefficients a0, a1, a2, b1, and b2, defining the difference equation for a digital filter as:
...
0
votes
0answers
25 views
Truncation of fractions
I am working on IIR filter design, I got filter coefficients, now I want to truncate the coefficients so as to perform scaling.
let 0.2145678340000 be one of my coefficients. I want to truncate to 0....
0
votes
2answers
96 views
Designing appropriate filter by choosing values for $A$ and $B$
Let $$y[n] - ABy[n-1] +A^2y[n-2] = x[n] - Bx[n-1] +x[n-2]$$
Where $A$ and $B$ are constants. Also there are two sounds which have $400$ hertz noise and the sampling rate is $8000$ samples/sec. The ...
0
votes
0answers
63 views
Gibbs phenomenon, which window to use?
"Rectangular window" and "Triangular window" have gibbs phenomenon
So which window should be used in fir filter design to have minimum or zero gibbs phenomenon
0
votes
2answers
52 views
What is the best to confirm that the output of a matched filter for a linear FM chirp is correct?
I have written a matched filter in matlab to compress a linear FM chirp signal and would like to confirm that the results of my range compression. My question is what is the best way to do this? I ...
0
votes
1answer
41 views
Group delay plot of a Moving average filter
I am implementing the moving average filter in Matlab. Using fvtool on this filter, gave the following output curve, is this group delay curve correct?
Edit:
My confusion is regarding the values of ...
1
vote
1answer
39 views
signed 2's complement of a negative number for Integer = 3 and Fraction = 9
I am working on signed 2's complement for my fractions coefficients. Below code can be used for positive inputs. However for a negative 2's complement when I added LSB with 1, then an error pops. I ...
0
votes
1answer
24 views
Confusion calculating length of Kaiser window
I am reading Digital Signal Processing Using Matlab by Ingle and Proakis (3rd ed.)
In Chapter 7, Section 7.3,
I am confused why he is adding 1 to main lobe width for calculating length of window.
I ...
1
vote
0answers
38 views
criteria for choosing a window for filter design? [duplicate]
When choosing any of windows(Bartlett, Rectangular, Hamming etc) for filter design, one important specification of window is minimum stop band attenuation
What can be other window specification(s) ...
1
vote
1answer
57 views
Moving Average Filter's Magnitude Response
I am working on filtering of data using the Moving average filter in MATLAB.
My data is recorded temperature values on the Y-axis and Time(in seconds) on the X-axis
(I'm getting the magnitude response ...
0
votes
0answers
17 views
cascade realisation from direct realisation
I am trying to convert filter realisation from Direct form 1 to cascade using function provided from Digital signal processing by Proakis. I designed lowpass IIR filter and extracted numerator and ...
1
vote
1answer
69 views
Frequency conversion in IIR lowpass-to-lowpass transformation
We use
$\ z^{-1} \xrightarrow{} \frac{z^{-1}-\alpha}{1-{\alpha}z^{-1}}$
and
$ \alpha = \frac{\sin(\omega_c^{'}-\omega_c)/2}{\sin(\omega_c^{'}+\omega_c)/2}$
for a lowpass-to-lowpass frequency ...
1
vote
0answers
41 views
What could be the optimal filter given this situation?
I am using a camera and a Deep Neural Network to predict one angle. This network received as input the frame, and calculates the mean and the variance associated to the prediction (which is basically ...
1
vote
1answer
68 views
Relation between filter order and window length for FIR filter
In case of FIR filter design, is the following relation always applicable or there are other relations/formulas also?
If window length is denoted by $M$ ,then filter order will be $M-1$
0
votes
1answer
46 views
How to quantize filter coefficients to 10 bits
I am trying to learn digital filter design. One of the concept is quantization of filter coefficients. I used Designfilt to design an lowpass IIR filter and obtained coefficients. Now I want to ...
0
votes
1answer
27 views
formulas for passband ripple and stop band attenuation?
I am reading the proakis book"DSP USING MATLAB 3rd Edition"
In chap 7, article 7.3, i came across example 7.8,where i saw formulas for pass band ripple and stop band attenuation
I have ...
3
votes
0answers
29 views
Are there any tools for generating fixed point filter implementations?
It's very easy to make a filter in Scipy or many other tools, but implementing this filter in fixed point in C or VHDL/Verilog is always a chore. I mean, in theory it's just a matter of adequately ...
2
votes
1answer
41 views
How to derive 2nd order Butterworth condition for the damping coefficient mathematically?
The magnitude of 2nd order low pass filter is given as
$$|H(\omega)|^2= \frac{1}{(1-(\frac{\omega}{\omega_o})^2)^2+(\frac{2\zeta\omega}{\omega_o})^2}$$
Now in order to achieve maximally flat within ...
2
votes
1answer
53 views
Calculation of gain at certain frequency in case of nth order IIR filter
There is this method for to set 0dB gain to be at wanted frequency (fc) (Octave/Matlab example for biquad LPF):
...
1
vote
0answers
34 views
The size of an FIR filter for PDM-PCM conversion
I have been trying to understand how the conversion from PDM to PCM happens so that I could interface with a microphone. I have been doing some research online and I found that the most common way to ...
1
vote
2answers
56 views
Why i am not getting low pass output despite the fact that my code is for Low pass?
I have tried to make a function to implement Low pass filter using butter worth technique,and i have taken code from different places in article 8.3 of proakis book,"DSP Using Matlab 3rd Ed"
...
0
votes
1answer
29 views
the best pre emphasis for MMSE equalizer
The system consists of multiple low-pass filter and noise, $h_1$, $h_2$, $h_3$, ..., $n_1$, $n_2$, $n_3$, ...
At the transmitter, the power of signal is fixed; and at the receiver, MMSE equalizer is ...
0
votes
1answer
60 views
Pole locations of Butterworth filter
I am reading Proakis book "DSP using Matlab", 3rd edition.
I am reading chapter 8, section 8.3, p. 402, and I am confused regarding the equation of poles (roots of denominator of system ...
1
vote
1answer
33 views
Calculating normalized edge frequencies for filter design in Matlab
What is the proper formula for converting ordinary frequency to normalized edge frequency in matlab for use in filter design commands like cheby2 etc
The wikipedia page shows three different formulas ...
3
votes
1answer
37 views
3 dB bandwidth of a filter
I am solving one of the question from signal processing about calculating the 3dB bandwidth of the filter. But I am stuck once I got the magnitude response of the filter. Can someone help me with this?...
0
votes
2answers
39 views
Confusion implementing chebyshev type 2 band pass filter in matlab
I want to design a band pass Chebyshev Type II filter using analog prototyping. The order of filter is 20 with a value of 60 dB stop band attenuation and 0.75 dB pass band ripple where,
Pass band edge ...
1
vote
2answers
60 views
How to use Octave ellip() coefficients for 3-band C++ crossover
I have been working on making a 3-band audio crossover in C++, with the goal of activating/deactivating a different device depending on whether the low, mid, or high range of the input is above a ...
-2
votes
1answer
37 views
Stop band ripple vs stop band attenuation
What is difference between stop band ripple and stop band attenuation in context of filters?
1
vote
1answer
45 views
Finding number of alternations in parks mcclellan
I'm given this question and asked to find number of alternations for filter 1 and 2, using parks mcclellan algorithm.
I search for solution and find this answer :
My question is why the number of ...
