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Tremor issues.
HbG
post May 6 2005, 12:23
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I first noticed this some 2 years ago. I've got a HP Jornada 568 PocketPC with a 256MB CF card which i use as MP3/OGG/MPC player, i know this is hardly the best way to listen to music, but it's better to use the hardware i have than shell out for something new.

The problem is, i hear noticeable artifacts when playing OGG's with certain types of music, most notably continous low tones. A good example where this happens is the start of Radiohead - Lucky. It sounds like there is some weird higher harmonic in it, i can't really describe it, but it's very audible to me.

Mac explained to me this is what you can hear when you reduce bit depth without dithering. Since PocketPC's as far as i'm aware don't have any floating point units and therefore can't use the normal Vorbis decoder, it would appear this is a bug in Tremor. I've tried two different programs to play OGG's on the PocketPC, PocketDiVX (later renamed to PocketMVP) and BetaPlayer, it makes no difference.

Because the issue might also be something other than Tremor and i can't decode to a wav file on my PocketPC, i have no way of verifying this and putting some samples online for everone to listen to. Is there a Tremor compile for windows i can use to confirm this?


--------------------
Veni Vidi Vorbis.
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saratoga
post Jun 1 2009, 03:15
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Hopefully MPC will be available on the Fuze soon via rockbox.

That said, Tremor could still use some work. Most firmwares have very slow ogg decoding leading to decreased battery life. A faster IMDCT in Tremor would go a long way towards fixing that. Unfortunately most people are hesitant to release code like that under suitable license.
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AshenTech
post Jun 1 2009, 05:12
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QUOTE (Mike Giacomelli @ May 31 2009, 20:15) *
Hopefully MPC will be available on the Fuze soon via rockbox.

That said, Tremor could still use some work. Most firmwares have very slow ogg decoding leading to decreased battery life. A faster IMDCT in Tremor would go a long way towards fixing that. Unfortunately most people are hesitant to release code like that under suitable license.


only issue i have had with rockbox is on some units it lessens batt life quite drastically, so much so that the bennifit isnt worth the cost for people like me who use their units for long periods(got fuze in part because its got great batt life)

we will see, I wont rockbox my fuze till its debuged and there are reports on its effect on batt life :/
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Posts in this topic
- HbG   Tremor issues.   May 6 2005, 12:23
- - john33   http://www.rarewares.org/files/ogg/oggdecT.zip   May 6 2005, 12:33
|- - HbG   Thanks for the link. Seems the issue is with the ...   May 6 2005, 13:24
- - john33   I think I'm right in saying that there has nev...   May 6 2005, 13:48
|- - aspifox   QUOTE (john33 @ May 6 2005, 12:48 PM)I think ...   May 6 2005, 16:16
|- - HbG   Low precision mode you say.. that might be it. A q...   May 6 2005, 21:32
|- - picard   QUOTE (aspifox @ May 6 2005, 04:16 PM)I hope ...   May 23 2005, 08:32
||- - rt87   QUOTE (picard @ May 23 2005, 03:32 PM)QUOTE (...   May 23 2005, 17:59
||- - picard   QUOTE (rt87 @ May 23 2005, 05:59 PM)You misse...   May 23 2005, 22:23
||- - system_saboteur_13   Hi all, I'm searching for a new algorithm for ...   Jul 1 2005, 13:13
||- - timber   QUOTE (system_saboteur_13 @ Jul 1 2005, 13...   Jun 3 2009, 14:14
|- - cruzlee   QUOTE (aspifox @ May 6 2005, 16:16) I hop...   Aug 14 2008, 21:57
- - HbG   Even if it doesn't answer my question, it stil...   May 6 2005, 14:43
- - HbG   It'd be nice if it were possible to use normal...   May 23 2005, 12:50
- - Mike Giacomelli   It would be odd for them to use low precision give...   Aug 14 2008, 22:27
- - Yirkha   Unfortunately, Tremor in latest iAUDIO 7 firmware ...   Aug 15 2008, 14:37
|- - sprockkets   Is by inferring or by actually seeing the code? At...   Aug 15 2008, 20:45
- - Yirkha   By actually seeing the co... uhm, nobody can have ...   Aug 15 2008, 21:44
- - Rotareneg   I'm not sure iAudio themselves even touch that...   Aug 15 2008, 21:52
- - sprockkets   I see. The D2, U3, and 7 use the same ARM946-ES co...   Aug 20 2008, 01:20
- - sprockkets   Well, I tried, but of course the firmware is signe...   Aug 20 2008, 01:51
|- - Mike Giacomelli   QUOTE (sprockkets @ Aug 19 2008, 20:51) W...   Aug 20 2008, 04:22
- - sprockkets   Ok, so explain to me what it means to ((((n)>...   Aug 20 2008, 04:37
|- - Mike Giacomelli   QUOTE (sprockkets @ Aug 19 2008, 23:37) O...   Aug 20 2008, 04:45
- - Yirkha   As have been already stated by others, it's no...   Aug 20 2008, 05:15
- - sprockkets   I see. And just by changing the value did not work...   Aug 20 2008, 06:00
- - Yirkha   I'm hacking the original firmware, selfishly w...   Aug 20 2008, 17:30
- - pellgarlic   i know this is a relatively old post, but i came a...   May 29 2009, 15:33
- - Yirkha   That's great news, thank you very much! It...   May 29 2009, 18:14
- - AshenTech   ogg support isnt really that hard to find, sansa c...   Jun 1 2009, 01:40
- - Mike Giacomelli   Hopefully MPC will be available on the Fuze soon v...   Jun 1 2009, 03:15
|- - AshenTech   QUOTE (Mike Giacomelli @ May 31 2009, 20...   Jun 1 2009, 05:12
|- - Mike Giacomelli   QUOTE (AshenTech @ Jun 1 2009, 00:12) onl...   Jun 1 2009, 15:55
|- - AshenTech   QUOTE (Mike Giacomelli @ Jun 1 2009, 08:5...   Jun 2 2009, 03:39
|- - Mike Giacomelli   QUOTE (AshenTech @ Jun 1 2009, 22:39) QUO...   Jun 2 2009, 03:46
|- - Soap   QUOTE (AshenTech @ Jun 1 2009, 22:39) QUO...   Jun 2 2009, 03:50
- - Rotareneg   Wow, I figured they would never fix that! Time...   Jun 1 2009, 18:07


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