Timeline for Aliasing vs Imaging. What is imaging?
Current License: CC BY-SA 3.0
6 events
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| Nov 4, 2016 at 13:38 | comment | added | Izzo | @ScottSeidman I think you're misinterpreting what I'm saying. In the process of plain old up-sampling (no polyphase implementation), you add a zeros between the time domain samples. This is what introduces the imaging. So at this step, you are indeed introducing zeros into the time domain. However, you would then low pass filter this to remove the imaging and it would thus remove the zeros. Also look at the time domain signal in plot B of what I posted. | |
| Nov 4, 2016 at 13:30 | comment | added | Scott Seidman | -- no, upsampling introduces the zeros in the frequency domain, resulting in something approximating an interpolation in the time domain. I'm sure there are situations where you insert zeros in the time domain, but I can't say that I've ever come across any. Feel free to show me otherwise. | |
| Nov 4, 2016 at 13:20 | comment | added | Izzo | @ScottSeidman What are you talking about? Upsampling could introduce zeros in any domain, but it's typically done in the time domain. | |
| Nov 4, 2016 at 13:15 | comment | added | Scott Seidman | You're adding zeros in the FREQUENCY domain, not the time domain, so you are not introducing high rates of change to the signal, but to the signal's spectrum. | |
| Nov 4, 2016 at 13:11 | history | edited | Izzo | CC BY-SA 3.0 |
added 827 characters in body
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| Nov 3, 2016 at 21:10 | history | answered | Izzo | CC BY-SA 3.0 |