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LAME and normalization
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| biznology |
Hey,
This is more of a procedural question and perhaps simple.
Recently when converting WAVs I wanted to test normalization before encoding to 192. The prog I used (cDex) normalized, and then encoded. Normalization took about 1 min whilst encoding took ~15mins (it was a set). Did the normalization modify the original WAV? Or did it simply record modifications for the later MPEG?
Thanks| |
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| hey cheggy |
| Normalising is just changing the volume so that it peaks just under 0dB, and does not clip. |
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| Jay M |
Well, normalization is making the sound as loud as possible without changing the wave, except amplitude, right?
I think your program found a peak (a tick e.g.) which had the biggest amp possible, so normalization could not be done.
(I think it works like this, but I'm not sure) |
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| biznology |
| well i recorded it while making sure it wouldnt clip...so this means it did nothing? thatd be great cause i dont want to have to rec again|:D |
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| biznology |
I was mostly concerned as the source wasnt the best and considerable mixing was necessary to ge the levels of mid, bass and vocal decent - much less perfect.
i was worried that normalization would even the two out- making the sound quality go back to again| |
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| DeZmA |
| depends on what settings you normalised.. if you normalised at system peak settings it'll go just under 0db. If you go above it there will be clipping. If you just had the choice to click normalise yes/no there will be nothing changed except volume so don't worry. When it comes to mastering it can be handy to normalise a little under the 0db so there is more space for compression etc. |
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| biznology |
| cool thanks...looks like Im cool| |
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| shockwavedj |
| I'm not sure, but I think that mp3 encodes audio as a pair of mantissa and exponent representation. Exponent deines the dynamic range of the audio frame, and mantissa represents itself the audio amplitude. So, as normalization not adds quality, and mp3 quality doesn't depend on amplitude (but do on relative amplitude between freqs) I suppose normalization is a futile process. However, every mp3 codec can do PCM to (mantissa, exponent) translation on its own, so if you don't know how your codec works , normalization is a good stage. |
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