Timeline for How to use SDR equipment and Gnuraio record `time domain` data?
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
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| Jun 22, 2022 at 22:28 | comment | added | Marcus Müller | That is very well said, @JohnVE3WNA! | |
| Jun 22, 2022 at 22:23 | comment | added | user21417 | Man, do people get bent out of shape over Gnu Radio. It's a tool, not a perfect research model. Each module has well-defined inputs and outputs, and well-defined behaviours. The file sink eats data as fast as possible, and lays that down into a well-defined file format with literally no other promises. If you feed it a stream of complex 32's or floats, that's what it writes. No other guarantees. The intelligence -- the domain -- is a human construct that we use so we can have a conversation about some data after we've done something with it. | |
| Jun 22, 2022 at 20:41 | comment | added | David Hoelzer♦ | @Jack0220 "I don't like it" isn't a reasonable reason to downvote. | |
| Jun 22, 2022 at 15:55 | comment | added | Marcus Müller | Hey Jack, I don't think that's a good reason for downvoting an answer! | |
| Jun 21, 2022 at 20:54 | comment | added | Marcus Müller | you're absolutely right. The properties we ascribe to the signal are our business, GNU Radio really only sees a sequence of numbers. Actually, not even that. It sees items of a given byte length. For all that GNU Radio cares, it could be processing text or vector images. | |
| Jun 21, 2022 at 17:14 | comment | added | user21417 | (But I'm not sure what anyone wants from any of these Q&A.) | |
| Jun 21, 2022 at 17:12 | comment | added | user21417 | I meant "Can I suppose time scale of data is uniform distribution?" It seems to me that (as you say) the whole point of the sample rate is how fast we can stream the data to the file, but I don't think there is any promise of a range of this "time domain" data being put in the file uniformly across time. | |
| Jun 21, 2022 at 16:29 | comment | added | Marcus Müller | (we might have a misunderstanding on "as fast as possible" in the comment you cite, which I guess is mine: it's really just "in time order"; the "as fast as possible" describes the process of writing to the file, not anything "happening" DSP-wise) | |
| Jun 21, 2022 at 16:25 | comment | added | Marcus Müller | @JohnVE3WNA I can't know that, as I explain in the next sentence: Conditionally to the signal being sampled like that, "So, yes." | |
| Jun 21, 2022 at 15:12 | comment | added | user21417 | I suppose someone could address the specific question about whether the data time scale is a uniform distribution in the file. My understanding is that it isn't (but that doesn't matter), which is why I'm making the conceptual distinction in the related Answer. But I am cheerfully willing to be proven wrong. | |
| Jun 21, 2022 at 14:18 | comment | added | Marcus Müller | Could you elaborate on how it's poorly written? (this question goes out both to you, @Jack0220 and to the person who upvoted that comment within 5 minutes of it being posted). I'm willing to improve it! I don't care about reputation points much, I care about the quality of my answers. | |
| Jun 21, 2022 at 14:10 | comment | added | Jack0220 | I'm just going to give this answer a down-vote because I think it's poorly written. | |
| Apr 6, 2022 at 20:53 | comment | added | Marcus Müller | the fact that you're sampling at a sampling rate. The LO has absolutely nothing to do with it. I think it would be a very good idea if you took a big step back und made a drawing of your system, which involves everything from the receive antenna to the file sink, and clearly label what kind of signal (band pass or low pass and continuous-time or discrete time) you have at each point. | |
| Apr 6, 2022 at 20:27 | comment | added | kittygirl |
Thanks for the answer!Ask one more thing,what cause sink data uniform distribution in time domain?the LO?
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| Apr 5, 2022 at 12:22 | history | edited | Marcus Müller | CC BY-SA 4.0 |
added 261 characters in body
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| Apr 5, 2022 at 11:47 | history | answered | Marcus Müller | CC BY-SA 4.0 |