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Wave Corrector Users • View topic - Normalize first or filter first

Normalize first or filter first

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Normalize first or filter first

Postby citguy » Thu Feb 03, 2005 7:06 pm

The recent discussions on normalizing have got me rethinking my logic on whether to nomalize then apply filters or filter then normalize. Logic would suggest that normalizing after filtering would bring background noise back up with the content, but logic does not always reach the correct conclusion. I just did a 40 year old reel to reel tape and did the procedure BOTH ways. I was hard pressed to tell much difference but thought I might have heard more inter-channel crosstalk when I normalized first. I concluded that to filter then normalize and then filter one additional time is not good.
Stan
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Re: Normalize first or filter first

Postby adaywayne » Thu Feb 03, 2005 8:07 pm

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Postby Derek » Sat Feb 05, 2005 3:15 pm

Yes, the best approach is to normalise after you have finished other processing.

It is true as the original poster said, that normalising will increase the noise along with the signal. However the net effect on signal to noise ratio (the important parameter) is exactly the same. To take an example, say you have a file where the signal peak is -7dB and the noise floor is -50dB. The signal to noise ratio is therefore, 50 - 7 = 43dB.

Signal = -7dB
Noise = -50dB

1. Apply hiss filter (at 14dB setting) and then normalise (to -1dB):
1a. Hiss filter:
Signal = -7dB (no change)
Noise = (-50 -14) = -64dB
1b. Normalise
Signal = (-7 + 6) = -1dB
Noise = (-64 + 6) = -58dB


2. Normalise ( to -1dB) and then apply the hiss filter (at 14db setting)
2a. Normalise
Signal = (-7 + 6) = -1dB
Noise = (-50 + 6) = -44dB

2b. Hiss filter:
Signal = -1dB (no change)
Noise = (-44 -14) = -58dB


So you see that in both cases you end up with the same result.
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Postby adaywayne » Sun Feb 06, 2005 4:58 pm

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Postby Derek » Sun Feb 06, 2005 5:16 pm

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