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Volume Display: Controls whether the volume is displayed as a graphic or a
numerical percentage value on the Status Bar.
Battery Display: Controls whether the battery charge status is displayed as a
graphic or numerical percentage value on the Status Bar.
Peak Meter (Recorder only)
The peak meter can be configured with a number of parameters. (For a description
of the peak meter see page 19.)
Peak Release: This determines how fast the bar shrinks when the music
becomes softer. Lower values make the peak meter look smoother.
Peak Hold Time: Specifies the time after which the peak indicator will reset. If
you set this value e.g. to 5s then the peak indicator displays the loudest volume
value that occurred within the last 5 seconds. Big values are good if you want to
find the maximum value of a song. That might be an interesting value for copying
music from the jukebox via the analogue output to some other recording device.
Clip Hold Time: How long should the clipping indicator be visible after clipping
was detected?
Performance: In high performance mode, the peak meter is updated as often
as possible. That reduces the chance of missing a peak value, making the peak
meter more precise. In energy save mode the peak meter is updated just often
enough to look fluid. This reduces the load on the CPU and thus saves a little bit
of energy. If you crave for every second of runtime of your jukebox or simply use
the peak meter as a screen effect, the use of energy save mode is
recommended. If you want to use the peak meter as a measuring instrument
you'll want to use high performance mode.
Scale: Select whether the peak meter displays linear or logarithmic values. In dB
(decibel) scale the volume values are scaled logarithmically. This very similar to
the perception of loudness. The volume meters of digital audio devices usually
are scaled this way. If you are interested in the power that is applied to your
headphones you should choose linear display. Unfortunately this value doesn't
have real units like volts or watts since that depends on the phones. So they can
only be displayed as percentage values.
Minimum and maximum range: These two options define the full value range
that the peak meter displays. Recommended values for dbFs are -40 for min. and
0 for maximum. For linear display, use 0 and 100%. Note that -40 dbFs is
approximately 1% in linear value, but if you change the minimum setting in
linear mode slightly and then change to dbFs you notice vast changes. You can
use these values for 'zooming' into the peak meter.
2.4 SYSTEM OPTIONS
Battery
Options relating to the batteries in the Jukebox unit.
Battery Capacity, which can be used to tell the Jukebox what capacity (in mAh)
of battery is being used inside it. The default is 1500mAh for NiMH battery based
units, and 2300mAh for LiOn battery based units, which is the capacity value for
the standard batteries shipped with these units. This value is used for calculating
remaining battery life.
Rockbox User Manual