Gary Schafer (@Gsparky2004)
I think I figured it out. It's not really a "DC" component (though that is where it lies on the spectrum); it's due to the ends of the original spectrum not lying...
"Maybe the thing to be learned is that you had better control of the results when you applied the window in the time domain."I was thinking the same thing. Plus,...
I'm playing around with frequency domain windowing (just because that is where my brain wanted to go, and not for any real reason). I've created a short Octave /...
Thanks for confirming my untested hypothesis that this would work with a complex shift, since DirkBell stated that trying to shift with a real cosine would cause...
Thanks for the offer. I think DirkBell hit it on the head by suggesting that the method that Analog Devices suggests doesn't work. Also, I'm using Gnu Radio Companion,...
Ah! That makes sense. In other words, you can't get there from here. I was trying to figure out all of the different methods for creating a band reject filter, and...
Thank you for the suggestion. Aliasing should not be a problem. I'm using a 50 kHz highpass filter (100 kHz bandwidth total at baseband) with a 2.4 MHz sample rate....
"Is a peak of the cosine wave consistent with the peak of the filter that is being transformed?" Yes, I did. I had that same thought, though I don't know why...
I'm reading this document from Analog Devices and it states that, when creating a band reject filter, its possible to first create a lowpass filter, convert that...
Just doing a quick drive-by "Thank you!" I've been pounding my head on the Wall of Knowledge trying to understand why "FFT assumes periodicity" is wrong. Your statement...
I've now tried a modified flowgraph by adding the two signals coming out of the LPFs, and I'm able to recover either LSB or USB (so long as they're the only signal...
Fair enough. I've not dealt much with HF comms (which is where the SSB predominates)."(...and the extra 3dB S/N is a wanted plus)"That right there is probably enough...
Good morning, all! I've been poring over Rick Lyon's paper on the phased method demodulator for SSB AM, specifically this particular block diagram:I've recreated...
UPDATE: I figured out how to implement these concepts in Gnu Radio (since I cannot program worth anything), and it worked flawlessly. Unfortunately, in Gnu Radio,...
Out of curiosity, how are you handling the +/-pi boundary issue? If one sample falls on one side of the boundary, and the other sample falls on the other side, wouldn't...
Not for implementation, but to answer a question from a student. (Kaz called it when he said, "It is only useful to know that theoretically as part of a lecture."...
So, is that a "Yes, you can, but it's a silly way to do it?"Let me ask the question a different way: Would anyone on this forum implement an IIR filter in the frequency...
Silly question: Is it possible to implement a IIR filter in the frequency domain just as you would a FIR filter? Or is the answer, "Well, you COULD, but that's a...
So there's this rumor that I just made up where she is working on a series of albums that she is sure will be hits. She's just going to number them in order, "One",...
Thank you, James. I understand the concept of analytical signal. I just wanted to ensure that it *only* referred to one without the negative image (as you've discussed...
First, thank you for the reply. I feel as if I've just completed a rite of passage because I understood everything you just said. Second, it sounds as if Slartibartfast's...
Question for the crowd: The definition of an "analytical" signal is a complex signal that only has a positive frequency. Would you still call a signal with only...
You want the difference in the phase angles, and the product of two
phasors multiplies the amplitudes and adds the angles...that's basic
complex arithmetic, there's...
Cool! Thank you!The issue is that, when you do this in the digital domain, the polar form of the math will give you the wrong value if the two samples being used...
Let me see if I can parse out your equation:$$ R \exp \{ j \omega t[0] \} \times R \exp \{ j \omega t [-1] \} = R^2 \exp \{ j \omega \left( t[0] - t[-1] \right)...
i still haven't figured out how to do math on this site.It turns our your code is fine; the only change that @stephaneb made below is he used a double dollar sign...
Thanks for the reply. Does Frerking explicitly mention calculating phase difference between consecutive samples by multiplying one sample with the conjugate of the...
In this case, it is simple. We're looking at this from the point of a FM signal. A digital version represented by complex samples will only have an instantaneous...
Hmmm. I tried your mathjax on the Mathjax.org demo page, and it rendered perfectly. I don't think the problem is your math.Rather than try to make the math work...
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