- This topic has 7 replies, 5 voices, and was last updated 18 years, 2 months ago by
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So whats the skinny with this Xfi stuff, supposed to make your compressed mp3s sound as good as their source
http://www.creative.com/press/releases/welcome.asp?pid=12620
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The sound restoration works on the X-Fi sound cards well enough. Not sure quite how this device would work.
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Cant understand how they can upsample on something which doesnt have the data any more?
Surely its gotta be a gimic?
any Electrical engineers knocking about
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I doubt it’s upsampling, more something to do with trying to restore the lost bass and harmonics from the info thats left (probably physical modelling). Like if you convert a classical guitar piece into MP3 etc it sounds rubbish. But if you analyze the audio stream I guess you could re-construct harmonics using physical modelling and mix that back into the audio.
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I doubt it’s upsampling, more something to do with trying to restore the lost bass and harmonics from the info thats left (probably physical modelling). Like if you convert a classical guitar piece into MP3 etc it sounds rubbish. But if you analyze the audio stream I guess you could re-construct harmonics using physical modelling and mix that back into the audio.[/quote:9f77bf5973]
probably
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The X-Fi Crystalizer upconverts MP3 music by analyzing and identifying which parts of the audio stream have been truncated or damaged during compression. It intelligently and selectively restores the highs and lows such as the snare drums, basses, cymbals crashes and guitar plucking that are damaged during the compression of MP3s.[/quote:7a7ec9e661]
They used the word “Upconverting”, that doesn’t mean that the sample rate is increased. Quite possibly interpolated, but not increased.
This quote points towards physical modelling. You can easily isolate drum beats from a audio stream and if you have a physical model of the drum and the MP3 version it would be quite possible to compare them and fill in the gaps.
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Xmod…im shaking my head here! (from side to side)
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