Rockbox mail archiveSubject: berzerk peak meter? Alpha testers wanted.
berzerk peak meter? Alpha testers wanted.
From: Philipp Pertermann <philipp.pertermann_at_web.de>
Date: Sun, 22 Sep 2002 17:29:21 +0200
I still am fiddling with the volume meter. Now I've come to
a point where I have to make a decision concerning the
system load <-> precision.
The MAS chip provides a 'quasi peak detector' that we can
read values from. It doesn't work very well. If a peak
happens in the music somewhen between two read outs we miss
it. Thus the more often we read values the higher ist the
probability that we actually hit a peak.
Reading out the MAS often is not a good idea in two
1.) it increases the power consumption
2.) it increases the system load. If the system load becomes
high stops / skips might occur.
I've implemented two strategies for reading out the MAS
normal mode | berzerk mode
reads once per redraw | 1 - 20 reads per redraw
- lower precision | + higher precision
- clips undetectable | + clips detectable
+ lower power consumption | - higher power consumption
+ lower system load | - higher system load
In both modes the 'frame rate' is the same so you don't see
much difference unless you watch out for peaks.
I put an unofficial version on
In the menu General settings ->Display->Peak meter you can
switch berzerk mode on / off.
Now I want to know what you think: Do we need that berzerk
mode or is the normal mode enough? Do you encounter any
problems playing back mp3 in berzerk mode?
Received on 2002-09-22