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Why Does Digital Gain Go Past 0 dB?

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Alex2140:
"In digital recordings the decibel is referred to as dB DFS (Digital Full Scale) where 0dB DFS is the absolute upper limit and all values are measured in minus values, there is no such thing as a positive dB in Digital Full Scale." from http://wiki.librivox.org/index.php/Basic_Principles_of_Audio_Recording yet Rockbox being digital allows going past 0dB in recording Line-In.  Why?

Is there a tutorial on using Rockbox as a Recorder?  Or should I just make sure the clipping indicator NEVER goes off, the clipping indicator being the far right vertical bar that becomes thicker in width on clip?  I ask because some of my recordings will be mixed with other sources so I don't want to run into problem when leveling all the sources together.

Thanks

saratoga:

--- Quote from: Alex2140 on April 02, 2015, 02:10:24 PM ---"In digital recordings the decibel is referred to as dB DFS (Digital Full Scale) where 0dB DFS is the absolute upper limit and all values are measured in minus values, there is no such thing as a positive dB in Digital Full Scale."
--- End quote ---

0dBFS is the loudest possible digital sample, so all ones if unsigned integers.


--- Quote from: Alex2140 on April 02, 2015, 02:10:24 PM ---yet Rockbox being digital allows going past 0dB in recording Line-In.  Why?
--- End quote ---

Thats a gain adjustment, so positive values mean the volume is increased. 

Alex2140:
Is my understanding of the clipping indicator correct?  Thx

404_user_not_found:

--- Quote from: Alex2140 on April 02, 2015, 03:35:32 PM ---Is my understanding of the clipping indicator correct?  Thx

--- End quote ---
Your recorded waves should have a some space before they will get into 0 dB. After 0 dB your sound data will be dropped and that causes a clipping.


--- Quote from: Alex2140 on April 02, 2015, 03:35:32 PM --- Rockbox being digital allows going past 0dB in recording Line-In.  Why?

--- End quote ---
You should understand that 0dB in Line-In like "Record my sound and don't touch recorded wave by applying a volume change", not "record my sound at absolute upper limit".

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