[alsa-devel] Mixer volume/decibel mapping

Clemens Ladisch clemens at ladisch.de
Thu May 20 09:34:21 CEST 2010

Sebastian H. wrote:
> Is there always an 1 to 1 mapping from volume to decibel and vice 
> versa or can there be decibel values in between two volume steps?

The volume values are the device's hardware register values and could
have any random dB difference between steps (and that difference might
not even be constant over the entire range).  The volume/dB mapping just
tells you which dB or volume value is nearest to a given volume or
dB value.


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