How much battery life do you lose with EQ, crossfeed, dither, etc.? (gigabeat)

[tman]

Does anyone know about how much battery life you lose by activiting the various features (EQ, crossfeed, dither, etc.) on the gigabeat F40??

[saratoga]

Probably not much.  The CPU is so fast, and I believe frequency scaling is disabled as well.

[AlexP]

In terms of current draw, there is very little difference between playing music and not, so I don't imagine what you mentioned would add much more.

LCD makes the biggest difference I would think.

http://www.rockbox.org/twiki/bin/viewfile/Main/GigabeatInfo?rev=2;filename=Power.html

[tman]

In terms of current draw, there is very little difference between playing music and not, so I don't imagine what you mentioned would add much more.

LCD makes the biggest difference I would think.

http://www.rockbox.org/twiki/bin/viewfile/Main/GigabeatInfo?rev=2;filename=Power.html

Thanks for the replies everyone.

So you're saying that there isn't much difference in battery life between playing music constantly and not playing any?

If so, that is surprising to me.

Also, regarding that link, how can 'NOT PLAYING LCD OFF (70)' draw more current than 'Playing mp3 128kbps lcd off' (46-55)

[saratoga]

Also, regarding that link, how can 'NOT PLAYING LCD OFF (70)' draw more current than 'Playing mp3 128kbps lcd off' (46-55)

Theres a bug that causes how power draw when the system is first turned on.  I'm pretty sure those measurements are skewed by it.

[tman]

Also, regarding that link, how can 'NOT PLAYING LCD OFF (70)' draw more current than 'Playing mp3 128kbps lcd off' (46-55)

Theres a bug that causes how power draw when the system is first turned on.  I'm pretty sure those measurements are skewed by it.

Huh. So when you need to not listen for a while I guess it's better for battery life to just pause the player rather than turn it off?

[AlexP]

When the player is first booted it draws more current until audio is played.  Thereafter if music is stopped, current draw is normal.  It is therefore best to turn off the player when idle (of course).  The excess draw will only manifest if you turn on the gigabeat then don't play music.  As soon as you play anything, everything works as expected.

[tman]

When the player is first booted it draws more current until audio is played.  Thereafter if music is stopped, current draw is normal.  It is therefore best to turn off the player when idle (of course).  The excess draw will only manifest if you turn on the gigabeat then don't play music.  As soon as you play anything, everything works as expected.

OK - thanks. Don't let it sit w/out playing music after turn-on - check.

[bascule]

Alternatively, set the player to resume on start-up (Settings > System > Start Screen > Resume Playback) and it will be automagically fixed  

This also explains why playing Jewels appeared to chew so much battery for me; I was just booting and going straight to the plugins

[markun]

This also explains why playing Jewels appeared to chew so much battery for me; I was just booting and going straight to the plugins

The backlight also consumes quite a lot.

Here are some figures: http://www.rockbox.org/twiki/bin/viewfile/Main/GigabeatInfo?rev=1;filename=current-07-06-26.txt

[saratoga]

Why is frequency scaling disabled anyway?

[Llorean]

Because enabling it seemed to lessen battery life, and with it disabled we already get an equivalent amount of battery life to the original firmware, if not a little bit more (jury seems to be out on it).