Questions tagged [anti-aliasing-filter]
The anti-aliasing-filter tag has no usage guidance.
23
questions
0
votes
3answers
34 views
does aliasing occur always if i sample a vibration in real world applications?
I was reading about the aliasing effect and nyquist. I understand that aliasing effect occurs if the sampling rate is lower than twice the maximum frequency in the signal I want to sample.
So I was ...
0
votes
1answer
46 views
IQ Sampling and Oversampling Differences? *Confused*
Two different thought process that produce two different alias band calculations .... What concepts are these?
If I have two 1 GHz ADC's and they sample with 90 degree offset (A comment said this is ...
2
votes
1answer
71 views
Variance of a signal
How to calculate the variance of noise samples modeled as follows:
$n_a(t)$ is a
Gaussian zero-mean white noise process with (two-sided) power spectral density $\frac{N_0}{2}$. $n_a(t)$ is passed ...
0
votes
0answers
174 views
Does bicubic downsampling in PyTorch internally involve anti-aliasing?
Does bicubic downsampling in PyTorch torch.nn.functional.interpolate internally involve anti-aliasing? If not, how can we avoid aliasing when direct using bicubic ...
0
votes
2answers
139 views
Where should I set my anti-aliasing filter corner frequency for this signal?
I have a Fourier transform of an arbitrary digital signal. The transform has For 1024 frequency bins. The magnitude plot of the first 100 is below, with no surprises in the unplotted 924 bins.
Now, ...
0
votes
0answers
13 views
Pentile sub pixel layout display Anti Aliasing
Pentile displays have unline most RGB displays only 2 subpixels per pixel. Imagine two displays of similiar resolution and one is pentile and other rgb. Becose the pentile displays have 33% less ...
0
votes
0answers
20 views
Periodic non-uniform sampling - effective bandwidth to select correct anti-aliasing filter
What is the effective bandwidth of sampling at a rate $f_s$ for a burst of $N$ samples, where the bursts are triggered at rate $f_B$?
For example, say $f_s \approx$ 10 kHz, $N \approx$ 1000 and $f_B \...
1
vote
0answers
37 views
What is the minimum and maximum cutoff frequencies for the antialiasing filter for this ADC?
https://www.analog.com/en/products/ad9675.html
https://www.analog.com/media/en/technical-documentation/data-sheets/AD9675.pdf
It says in the data sheet that the Anti-Aliasing Filter has :
"...
0
votes
1answer
84 views
How do Anti-Aliasing-Filters in audio signal processing work?
I am a little confused about the use of anti-aliasing filters. As on how I am confused, please consider the following task:
Consider a simple sampling rate conversion system with a conversion rate ...
1
vote
1answer
361 views
polyBLAMP anti-aliasing in C++
How should 4 point polyBLAMP work. It does not really seem to dampen aliasing.
I have an floating point digital audio oscillator that makes a +1.0f jump at the end of every period.
My question is, ...
0
votes
1answer
417 views
Understanding anti aliasing filter
I'm working on a project for the university about the anti aliasing filter.
I have a small audio file, which has a sampling rate of 22KHz. Now when I downsample it 8 times, the file sounds weird. So ...
1
vote
1answer
189 views
How can I implement a triangular filter in MatLab, given it's Z-transform representation?
I have to implement an anti-aliasing filter for a certain processing step in MatLab. While searching in literature for inspiration, I came accross a paper in which the authors wrote the following:
...
2
votes
3answers
2k views
What is the filter with the less phase shift?
I have to analyze a dynamic signal but there is too much noise so I applied low pass filter but then there is too much phase shift.So what is the most reactive filter I can apply to my signal ?
Best ...
1
vote
2answers
340 views
Confused on application of Anti-Aliasing Filter
I have a question about the use of anti-aliasing filters prior to sampling a finite time signal and if they actually help anything.
The point of the anti-aliasing filter is to remove high-frequency ...
0
votes
1answer
432 views
Aliasing in digital communication system
In a digital communication system, is it possible to counteract the aliasing problem by properly tuning the constellation order $M$ and/or the carrier frequency?
Here is my train of thought, please ...
2
votes
2answers
4k views
Why analog anti aliasing filter is used before analog to digital converter when there is already a digital filter after ADC?
Normal data acquisition consist of:
Analog anti aliasing filter( Sampling frequency : $5\textrm{ kHz}$)
ADC - Digital Filter - (Sampling : 200K samples /sec)
Digital low pass filters Filters
DAC
...
0
votes
1answer
408 views
Anti-Aliasing when oversampled
From a comment in another question I read a statement
"In addition, the initial rate of 48kHz is already performing 6 times
oversampling and therefore the subsequent decimation by 6 will not
...
4
votes
3answers
503 views
How do optical anti-aliasing filters work from a frequency domain perspective?
To prevent aliasing caused by the finite number of pixels on a sensor, a blurring filter is commonly used. How does that work from a frequency domain perspective? What is the transfer function of such ...
3
votes
2answers
6k views
Why is a square wave aliased?
I understand an ideal analog square wave contains sine-wave-components above Nyquist frequency (and towards infinity) and is thus subject to aliasing. So obviously we need an anti-aliasing-filter. Or ...
0
votes
2answers
1k views
Interpolation based on sinc function
I implemented an interpolation method in C++ based on this equation
...
0
votes
2answers
76 views
Does MSAA make sense in audio / 1d data streams?
In graphics, MSAA is a technique where you take multiple samples of something per pixel and then average the values to get the final pixel value. The image quality improves as a result, and its ...
0
votes
2answers
789 views
Confused about anti-aliasing in analog filters
I'm a newbeginner when it comes to signal processing. I'm reading up about anti-aliasing, Nyquist and band-pass filters. There's something I don't get: Anti-aliasing in analog filters.
Lemme try to ...
1
vote
0answers
188 views
Anti-aliasing requirements for a Muxed Sigma-Delta Converter
It seems to be reasonably well accepted that Sigma-Delta ADCs have much looser requirements for the anti-aliasing filter due to both the noise shaping and high modulation frequency.
However, it seems ...
