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Clip+ hardware noise

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Milesdust:
Hi all, Rockbox is absolutely brilliant! Except I often hear hardware noise on three occasions: When the fade in/out effect is used on pausing/starting a track, when the disk is beign accessed heavily, and when turning the mp3 player off.

It sounds like a buzzing noise. Is this an issue that could be sorted out?

bertrik:
The buzz at the fade in/out effect is caused by the volume control in the audio hardware. The audio hardware has a built-in "auto-fading" mechanism that is currently enabled. Somehow each fade step causes a little click, and together in rapid succession these clicks sound like a buzz. If the auto-fading mechanism is disabled, it sounds like a big click at the end of fade-out. I think we're still not doing something right in rockbox with respect to that.

The noise on accessing disk is still a bit of a mystery. I can't hear it on my player, but other people can on their players. Can you try rockbox release 3.8.1 or a current build and see if it got better? It may also vary between "variants" of the clip+. You can find out which variant (0 or 1) you have by going into Menu System / Debug / View hardware info.

I don't know what the noise is on power-off. It could be same as the fade in/out noise.

LivArt:
Try to switch off Replaygain. I think it's better, but it's still here.

saratoga:

--- Quote from: LivArt on April 16, 2011, 04:28:06 AM ---Try to switch off Replaygain. I think it's better, but it's still here.

--- End quote ---

That just makes things louder. 

keyb_gr:

--- Quote from: bertrik on April 10, 2011, 07:51:10 AM ---The noise on accessing disk is still a bit of a mystery. I can't hear it on my player, but other people can on their players.
--- End quote ---
I can hear some a few seconds after the beginning of a new track with sufficiently sensitive in-ears (Shure SE420). (Some low-level ticking and buzzing that only lasts a short while.) It's not at all dramatic though, especially compared to the permanent loud ticking on the ClipV2. This is with a "variant 1" Clip+.

--- Quote ---I don't know what the noise is on power-off. It could be same as the fade in/out noise.

--- End quote ---
Whatever it is, it apparently acts like a current source. There's not that much on the SE420s, but it's a pretty healthy crack on HD590s or a line-level input.

If I were to venture a guess, I'd say the headphone amp is operating too long, maybe right up to the point where the negative supply charge pump shuts down.

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