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Chapter 13. Advanced Topics
having the backlight enabled all the time (Activating selectivebacklight section
(page 63) can further reduce power consumption).
13.5.2. Replaygain
Replaygain is a post processing that equalises the playback volume of audio files to
the same perceived loudness. This post processing applies a factor to each single PCM
sample and is therefore consuming additional CPU time. If you want to achieve some
(minor) savings in runtime, switch this feature off (see section
13.5.3. Peak Meter
The peak meter is a feature of the While Playing Screen and will be updated with a
high framerate. Depending on your player this might result in a high CPU load. To
save battery runtime you should switch this feature off (see section
13.5.4. Audio format and bitrate
In general the fastest decoding audio format will be the best in terms of battery runtime
on your player. An overview of different codec's performance on different players can be
found at
CodecPerformanceComparison.
Your target uses flash that consumes a certain amount of power during access. The
less often the flash needs to be switched on for buffering and the shorter the buffering
duration is, the lower is the overall power consumption. Therefore the bitrate of the
audio files does have an impact on the battery runtime as well. Lower bitrate audio files
will result in longer battery runtime.
Please do not re-encode any existing audio files from one lossy format to another based
upon the above mentioned. This will reduce the audio quality. If you have the choice,
select the best suiting codec when encoding the original source material.
13.5.5. Sound settings
In general all kinds of sound processing will need more CPU time and therefore consume
more power. The less sound processing you use, the better it is for the battery runtime
(for options see section
The Rockbox manual
6
(page 47)).
(version 3.14)
7.8
(page 57)).
4.3.2
(page 31)).
Sansa Clip v2
166
8.4
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