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Memory access noise on Clip+

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Gunbuster:
Thank you 404_user_not_found, we need people to test this as for the moment I'm like the only person in the world who have noted this so I don't expect it to make it to the master branch.

Furthermore it's a very lazy approach as I am no developer, I just reverted some past changes and we need people who know about this like bertrik to investigate further.

All I know is it greatly reduced the noise to a state where it were prior 3.8.1

[Saint]:
Perhaps my prior post was looked over, or something was lost in translation, but you are far from being the only person in the world to have noted this.

This has been noted a few times, across multiple devices.


[Saint]

Gunbuster:
Saint, by any mean I didn't overlooked your post, I know you acknowledged the problem exist.

Still for the time being, and to my knowledge, I'm the only one who have noticed an improvement with older firmwares, this is a fact.

This is why it needs further testing from people who suffer from the same issue.

Sorry again for the misunderstanding.

404_user_not_found:
My steps to reproduce a noticeable memory access noise in rockbox 3.13 with a new revision of sansa clip+ 8gb. This noise is only noticeable at the start of each tracks and noise stops after some seconds of playing.
1) Play big files that requires a high extensive disk activity like wav files with uncompressed PCM codec or FLACs. The tracks should have a some seconds of empty sound at the start. Just set volume to zero.
2) Listen with in-ears headphones with low impedance with low sensitivity (I tested with Koss the plug headphones). I can't notice a memory access noise with other types of headphones.

So may be you can get a rid of noise by changing headphones to another with better quality?


--- Quote from: Gunbuster on July 14, 2013, 09:58:46 AM ---Thank you 404_user_not_found, we need people to test this as for the moment I'm like the only person in the world who have noted this so I don't expect it to make it to the master branch.
--- End quote ---
With my steps to reproduce a noise this patch and your build changes nothing.


--- Quote from: Gunbuster on July 14, 2013, 09:58:46 AM ---All I know is it greatly reduced the noise to a state where it were prior 3.8.1
--- End quote ---
can't test with this version because of new revision of my sansa clip+, but noticed that 3.8.1 can't detect my internal memory but detects sd card. So I will try to make some tweaks to run rockbox from sd card.
I successfully run 3.7 in my sansa clip+ from sd card. And with my steps to reproduce a noise nothing changes - I also can notice a same noise as it was in 3.13.

saratoga:
The audibility of any analog noise will depend on the sensitivity of the headphones. Wither sensitivity the noise must be louder to be heard.

Regarding this issue, listening to the noise is not a great way to test since everyone has different headphones and different opinions. A better way would be to play silence, record the noise and then measure its amplitude.

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