Relative gate threshold: -20 instead of -10(?)

[nofishonfriday]

Hi,
in https://github.com/jiixyj/libebur128/blob/master/ebur128/ebur128.c#L99 I see relative_gate set to -10.0 while in EBU Tech 3342 is specified (page 6)

The relative threshold is set to a level of −20 LU relative to the absolute-gated loudness level.

So shouldn't relative_gate be set to -20.0 also or do I misunderstand this?
Thanks.

[audionuma]

Hello, as mentioned in the linked document :

The computation of Loudness Range is based on a measurement of loudness level as specified in ITU-R BS.1770 [2], albeit with a different relative gating threshold

See

libebur128/ebur128/ebur128.c

Line 1302 in c13deee

stl_integrated = minus_twenty_decibels * stl_power;

where the -20 LU LRA relative gating is applied, and

libebur128/ebur128/ebur128.c

Line 505 in c13deee

minus_twenty_decibels = pow(10.0, -20.0 / 10.0);

where it is initialized.

The integrated loudness relative gate is appropriately set to -10 LU.

[nofishonfriday]

Thanks for the clarification.