ccsnd Posted February 23, 2012 Report Share Posted February 23, 2012 The broken nomad thread made me decide to start a thread about aliasing. I started writing a whole things explaining what aliasing is, how under sampling creates it, and the theory behind it. Then I found this video. Discuss. Quote Link to comment Share on other sites More sharing options...
Jay Rose Posted February 26, 2012 Report Share Posted February 26, 2012 Okay: the mistake a lot of people make is thinking about distortion only in the digital domain. The initial signal has to survive the antialiasing filter, which means its incredibly unlikely there'll be anything at ~.5 Nyquist. And the distortion products have to survive the averaging filter in the DAC. This, of course, opens up a whole new can of filter-sharpness worms... Very glad just about every serious audio device from the past 20 years uses oversampling. Quote Link to comment Share on other sites More sharing options...
Tim M Posted April 13, 2012 Report Share Posted April 13, 2012 Hi Jay, can this ever be fully understood without a solid understanding of physics? What I think I'm taking from your statement is that because analog filters are never accurate enough to combat aliasing, then we must oversample in whole and let digital filters filter the accurate amount out? I've always tried to understand the Nyquist frequency, but without even really a basic understanding of physics I consistently get lost. Quote Link to comment Share on other sites More sharing options...
ccsnd Posted April 13, 2012 Author Report Share Posted April 13, 2012 no physics necessary. It's a fairly basic theory. I'm sure there are helpful youtube videos on Nyquist frequency stuff. A aliasing filter is nothing more than a low pass filter with a really high threshold and sharp curve. Quote Link to comment Share on other sites More sharing options...
studiomprd Posted April 13, 2012 Report Share Posted April 13, 2012 " a solid understanding of physics? " I have good news, and bad... first the good news: this isn't physics... but it is math, actually, Calculus Quote Link to comment Share on other sites More sharing options...
.png.279748a58a2b862b7aa5f3b84126e232.png)
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.