RockboxTracker:: All Projects: Tasklist

ID	Project	Task Type	Category	Severity	Summary	Opened
~~12570~~	Rockbox	Patches	Settings	Low	~~10 bands EQ~~	2012-01-29	6	2	Task Description Extends the number of EQ bands from 5 (2 shelf and 3 peak filters) to 10 (2 shelf and 8 peak filters). Some users will find this useful, in particular those that prefer not to use the shelf filters. It should work on all targets; the bands become active only if their amplitude is changed from 0dB. Not rocket science but I could not find any patch covering this so I had to write my own, I know some other users were looking for something similar.
~~12569~~	Rockbox	Patches	Battery/Charging	Low	~~iPod Classic - battery capacity update~~	2012-01-29	4	1	Task Description This extends the battery capacity range for iPod Classic and sets a new default value (550mAh). FYI, the thick 2007 160gb model has a 850 mAh battery. Note that this will not have any effect on the remaining battery % as indicated by Rockbox. It could be useful for determining the actual remaining running time, but I’m not sure if this is implemented in Classic.
12568	Rockbox	Patches	Configuration	Low	iPod Classic - limit volume to +6db	2012-01-29	12	4	Task Description The iPod Classic Cirrus CS42L55 DAC+amp chip is specified to output audio up to +12dB versus the reference level (0.775V RMS) and the current Rockbox driver implements this accordingly (note that the OF limits the amplification to a lower level). However, any amplification above +3dB applied to a 0dB signal results in serious clipping errors, the sound being distorted (oscilloscope measurements attached). This is not a surprise, given that +12dB translates in over 8V peak-to-peak output, way above what the iPod is capable of with its 3.7V battery. Distortions aside, +12dB can be overkill for most of the earphones (depending on the sensitivity) and not a very pleasant experience. If you put the iPod in your pocket and forget to lock it you may experience this frequently. In practice not all tracks have peaks reaching the 0dB level (actually nowadays this is quite common given the "loudness war"). To provide some room for additional amplification when needed, I found the +6dB limit to be a good compromise.

~~12570~~

Rockbox

Patches

Settings

Low

~~10 bands EQ~~

2012-01-29

Task Description

Extends the number of EQ bands from 5 (2 shelf and 3 peak filters) to 10 (2 shelf and 8 peak filters). Some users will find this useful, in particular those that prefer not to use the shelf filters.

It should work on all targets; the bands become active only if their amplitude is changed from 0dB.

Not rocket science but I could not find any patch covering this so I had to write my own, I know some other users were looking for something similar.

~~12569~~

Rockbox

Patches

Battery/Charging

Low

~~iPod Classic - battery capacity update~~

2012-01-29

Task Description

This extends the battery capacity range for iPod Classic and sets a new default value (550mAh). FYI, the thick 2007 160gb model has a 850 mAh battery.

Note that this will not have any effect on the remaining battery % as indicated by Rockbox. It could be useful for determining the actual remaining running time, but I’m not sure if this is implemented in Classic.

12568

Rockbox

Patches

Configuration

Low

iPod Classic - limit volume to +6db

2012-01-29

Task Description

The iPod Classic Cirrus CS42L55 DAC+amp chip is specified to output audio up to +12dB versus the reference level (0.775V RMS) and the current Rockbox driver implements this accordingly (note that the OF limits the amplification to a lower level).

However, any amplification above +3dB applied to a 0dB signal results in serious clipping errors, the sound being distorted (oscilloscope measurements attached). This is not a surprise, given that +12dB translates in over 8V peak-to-peak output, way above what the iPod is capable of with its 3.7V battery.

Distortions aside, +12dB can be overkill for most of the earphones (depending on the sensitivity) and not a very pleasant experience. If you put the iPod in your pocket and forget to lock it you may experience this frequently.

In practice not all tracks have peaks reaching the 0dB level (actually nowadays this is quite common given the "loudness war"). To provide some room for additional amplification when needed, I found the +6dB limit to be a good compromise.

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