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#16
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Re: Recording XM
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#17
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Re: Recording XM
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#18
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Re: Recording XM
Fair enough. Let's hope that holds.
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#19
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Re: Recording XM
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#20
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Re: Recording XM
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The main thrust of lossless trading stems from the belief that, once something is recorded, it should remain identical each time it is copied. Lossy codecs decrease the quality with each transfer, and to promote the idea that everyone should get equal access to identical audio, lossless codecs are used. It is a physical fact that FM, XM, and even CD and SBD are lossy in comparison to the true signal, but this fact is beside the point here. Seeding XM radio brings about a slew of legal issues that I would rather not confront here on this site. I am sure there are places on the internet to attain this material if one is resourceful enough....
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#21
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Re: Recording XM
We use the term "lossy" a little loosely in the community... we are normally referring to 1990's lossy a la realmedia-mp3-ogg vorbis-vqa-etc. This is the kind of lossy that we're cracking down on. Hope this helps.
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#22
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Re: Recording XM
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All FM broadcasts are "bandwidth limited", which differs from "lossy" in the fact that full spectrum audio is bandpassed without psychoacoustic algorithms being employed to fool your ear to think all frequencies are present. Yes, limiting and compression are very prevelant in the broadcast chain, especially in the STL, but if they're analog links, they are simply amplitude envelope controls, and the basic spectrum is still passed (within the FM carrier restrictions, of course). Adding digital compression techniques that might be enountered in ISDN links as mentioned, will add an unknown factor, but I would assume that most stations would want a lossless path to their transmitter. Could MP3 play a role in timeshifting and replaying a live concert ? It's certainly possible, but an MP3 frequency falloff might be visable before the bandpass limit, so ....... So the unknown processing in the FM path does raise questions, but all things considered, it usually means it's a recording of the most readily available source, not necessarily the best possible. No members have liked this post.
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#23
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Re: Recording XM
wazoo,
Understood about the differences, but whether it's analog filtering, modulation, or perceptual coding, there is still some audio "loss" involved with the transfer....and each reduce the overall quality of the recording. Regardless, the goal of communities like this is to find the "purest" copy possible, and losslessly spread it to others. I'm not worried about the supposedly quality loss in XM or FM broadcasts as I am the legal issues with copying XM. I accept that not much (if anything) broadcast on XM is ever likely to get into the hands of the public in it's original source form, and would be fine with XM > lossless transfers of their broadcasts were it not putting TTD into legal jeopardy.
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#24
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Re: Recording XM
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Guess that my point was to clarify the differences between SONIC loss (loss of fidelity due to analog limitations or processing) versus MATHEMATICAL loss (which as we all know, comes from errors in creating, translating and reconstructing the digital signal). No members have liked this post.
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#25
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Re: Recording XM
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#26
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Re: Recording XM
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help with recording - PEPPER | Technobabble | 2 | 2006-03-28 08:26 AM |
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