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Add perceptual volume adjustment

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The perceived loudness change of a change in volume depends
on the listening volume: at high volumes a 1 dB increment is
noticeable, but at low volumes a larger increment is needed
to get a comparable change in loudness.

Perceptual volume adjustment accounts for this fact, and
divides the hardware volume range into a number of steps.
Each step changes the dB volume by a variable amount, with
most of the steps concentrated at higher volumes. This
makes it possible to sweep over the entire hardware volume
range quickly, without losing the ability to finely adjust
the volume at normal listening levels.

Use "Volume Adjustment Mode" in the system settings menu
to select perceptual volume mode. The number of steps used
is controlled by "Number of Volume Steps". (Number of steps
has no effect in direct adjustment mode.)

It's still possible to set a specific dB volume level from
the sound settings menu when perceptual volume is enabled,
and perceptual volume does not affect the volume displayed
by themes.

Change-Id: I6f91fd3f7c5e2d323a914e47b5653033e92b4b3b
This commit is contained in:
Aidan MacDonald 2022-11-22 04:10:35 +00:00
parent 15c4447b66
commit 5b27e2255a
17 changed files with 240 additions and 35 deletions
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17
manual/configure_rockbox/system_options.tex
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@ -137,6 +137,23 @@ This sub menu relates to limits in the Rockbox operating system.
\item LAN party computer $\rightarrow$ \dap $\rightarrow$ human
\end{itemize}
}
\opt{perceptual_volume}{
\subsection{Volume Adjustment Mode}
This setting selects the method used to adjust volume with \ButtonVolUp{} and
\ButtonVolDown{}. In \setting{Direct} mode each volume step changes the volume
by a fixed number of decibels (dB).
In \setting{Perceptual} mode, the hardware volume range is divided into a
number of steps, controlled by the \setting{Number of Volume Steps} option.
Each step changes the volume by a variable number of decibels (dB) so the
perceived loudness changes by about the same amount at each step. The dB
change is smaller at high volumes and larger at low volumes, so a large
range of low volumes are effectively compressed into a smaller number of
volume steps.
\setting{Volume Adjustment Mode} does not affect how volume is displayed by
themes.
}
\opt{quickscreen}{
\subsection{Use Shortcuts Menu Instead of Quick Screen} This option
activates the shortcuts menu instead of opening the quick screen when enabled.