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Anti-aliasing filter - Wikipedia
https://en.wikipedia.org/wiki/Anti-aliasing_filter#:~:text=An%20anti-aliasing%20filter%20%28AAF%29%20is%20a%20filter%20used,Nyquist%E2%80%93Shannon%20sampling%20theorem%20over%20the%20band%20of%20interest.
Anti-Aliasing Filters and Their Usage Explained - NI
https://www.ni.com/en-us/innovations/white-papers/18/anti-aliasing-filters-and-their-usage-explained.html
Because at this stage (before the sampler and the ADC) you are still in the analog world, the anti-aliasing filter is an analog filter. An ideal anti-alias filter passes all the appropriate input frequencies (below f1) and cuts off all the undesired frequencies (above f1). However, such a filter is not physically realizable. In practice, filters look as shown in illustration (b) below. …
Antialiasing Filter - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/antialiasing-filter
Anti-aliasing filters are applied so that when a set of sample points is inspected, the input frequency components that are present are uniquely related to the input data. Otherwise, there are many possible input frequencies (the aliases), all of which can produce the same data points.
How do Anti-Aliasing-Filters in audio signal processing ...
https://dsp.stackexchange.com/questions/55096/how-do-anti-aliasing-filters-in-audio-signal-processing-work
So, apparently before downsampling we apply the anti-aliasing filter, which will result in the part of the spectrum within the blue-dotted shapes. Now, we increase Omega by a factor of 2, such that.. I don't know. What exactly happens here ? audio anti-aliasing-filter Share Improve this question asked Jan 27 '19 at 11:10 user503842 135 1 4
The Quick Guide to Audio Aliasing | Black Ghost Audio
https://www.blackghostaudio.com/blog/the-quick-guide-to-audio-aliasing
To remove aliasing, you need to use an anti-aliasing filter. Quite often, an anti-aliasing filter takes the form of a low pass filter. The issue here is that when you cut the problematic frequencies, you also cut the desirable frequencies above the cutoff point. The best way to deal with aliasing is by preventing it, but if you can’t, your next best move is to apply an …
Which anti aliasing filter algorithm for efficient audio ...
https://dsp.stackexchange.com/questions/23416/which-anti-aliasing-filter-algorithm-for-efficient-audio-resampling
I'm building a real-time audio resampler (think pitch bend) that needs to have a several different performance vs quality configuration options. I understand that I'll need to apply a low-pass filter before resampling in order to avoid aliasing. The requirements for the first filter are this: very efficient; better than nothing
Q. What is 'aliasing' and what causes it?
https://www.soundonsound.com/sound-advice/q-what-aliasing-and-what-causes-it
SOS Forum Post. Technical Editor Hugh Robjohns replies: An alias occurs when a signal above half the sample rate is allowed into, or created within, a digital system. It's the anti-aliasing filter's job to limit the frequency range of the analogue signal prior to A-D conversion, so that the maximum frequency does not exceed half the sampling rate — the so-called Nyquist limit.
What is aliasing in DSP and how to prevent it?
https://technobyte.org/whats-aliasing-dsp-how-to-prevent-it/
The anti-aliasing filters attenuate the unnecessary high-frequency components of a signal. They band-limit the input signal by removing all frequencies higher than the signal frequencies. As a result, they help preserve a lot of information that is needed and remove unnecessary information.
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