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Topic: Clipping detection based on RG values? (Read 3258 times) previous topic - next topic
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Clipping detection based on RG values?

I wanted to indicate in foobar, if track with "RG track gain" applied to it would clip:

Code: [Select]
$ifgreater(
$add(
$muldiv($num($left($replace(%replaygain_track_peak%,.,),5),),89,100),
$num($replace(%replaygain_track_gain%,.,),)),
8899,Yes,No)

which basically means PEAK * 89 + GAIN (and multiplied by 100), but the result is incorrect: it doesn't shows correctly if the track is clipping

What's wrong here?

Clipping detection based on RG values?

Reply #1 –
Assuming clipping prevention and limiting etc are disabled, then for a given replaygain_track_gain and preamp_setting (fb2k preferences), the track will be scaled by

scale = 10^((replaygain_track_gain+preamp_setting)/20)


new_peak = replaygain_track_peak*scale


Does this help?

Cheers,
David.

Clipping detection based on RG values?

Reply #2 –
Yes, it helped. It cleared two things:

1. how to calculate clipping based on RG (I searched HA a lot and didn't find this)
2. it can't be made with foobar TF, as it doesn't support such math

thanks

Clipping detection based on RG values?

Reply #3 –
With reasonable accuracy David's clipping eq. can be approximated with simple 2-nd order polynomial over custom range:

10^(x/20) ~ 0.01*x^2 + 0.12*x +1

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