Helmi WM6 A2DP BT Stereo Thread (5.2.1620 Build 18125.0.4.2)

[slightlyevolved]

I have the HT820's and Hemi's WM6. I'm sticking with it. All attempts with 3.3/3.5 have failed me and out of the box (in all fairness, I did just get this phone replaced in warranty after the radio died in my old one). A2DP is flawless with no skipping unless I have the CPU under heavy load.

Put it this way. I wasn't paying attention and my headset started skipping, quick look at the task manager showed that I had 17 programs running! A quick "Stop All" and I was skip free again.

I would like to get the bitrate a bit higher as "S"-es come out a bit distorted still and the highs are a bit lossy. Originally they were:
BitPool 30
MasSupportedBitPool 30
UseJointStereo 1

Based on some info I saw here, I've moved them to:
BitPool 56
MaxSupportedBitPool 128
UseJointStereo 2

But really, what increases the sound quality? I've seen JointStereo as 0,1,2; which is really stereo and which is joint?

I'd appreciate any info on that.

Also, thanks everyone who made WM6 possible on my 6700. It's the most stable and best performing ROM I've used yet.

[seang]

Originally Posted by shiggs

Doesn't the "fix" cause severe battery drain?

after a couple days of using the fix, i can report that i t does drain the battery severely.

[edufur]

For those that want to know, any setting other than 0 (zero) for the JointStereo, you are really combining both channels into each ear. Zero is true stereo separation. Picking 1 will combine the stereo tracks together, then plays both tracks in both ears... I have no idea why people think option 2 is a legit setting. Neither setting will improve the skipping problem... which I still have and am eager for a solution.

[edufur]

Update: BitPool and MaxSupportedBitPool seem to play a bigger role than I thought. Here is what I recently did after a lot of fiddling and resetting.

1. Paired with defaults of 30.
2. Refreshed the device.
3. Set BitPool to 37 and Max to 41.
4. Told device to use as Wireless Stereo Headset.

Minimal skipping now (after LOTS before), but the quality still isnt that good... even with this expensive headset. I think there are some driver issues with this ROM. Maybe this portion of the next rev needs some love.

My point: keep playing with the BitPool settings in single digit increments until you start to notice a change, then stay close to that range. If you want stereo, use JointStereo 0

[allanak]

Originally Posted by semicharm

BTW, anyone try hemi's WM6 with a HT820?

Just paired mine today and listened to about a half hour of music or so with very minimal skips...light years better than anything on any of the WM5 ROMs I was using. I didn't have to hack up anything, install any fixes, change any reg keys or anything at all - great right after the flash.

[sethlo]

According to this article at ppc magazine, JointStereo = 1 retains stereo seperation in Windows mobile 6:

http://www.pocketpcmag.com/blogs/ind...&c=1&tb=1&pb=1

He basically says that all you need to do in WM6 is remove BitPool, MaxSupportedbitPool, and maybe add SampleRate 48000 if you think you need it. I think he is right.

I set JointStereo back to 1, deleted bp and msbp, then I added the SampleRate 48000 dword. So far it sounds great with zero skipping.

I am pretty sure I hear the separation in the Gorillaz "O Green World" on Demon Days album. I am still looking for a better sample song.

Also, I read this interesting article on Joint Stero: http://harmsy.freeuk.com/mostync/

Apparently, according to the article, the use of proper "Joint Stereo" does not eliminate stereo separation. Not exactly sure if this applies to A2DP bluetooth, but I suspect it is the same concepts.

edit: edited SampleRate 4800 to 48000 above

[edufur]

OH MY GOD! Thanks Sethlo for kind of setting me straight. I checked both those articles and they are kind of in conflict with each other BUT they are both accurate in proving me wrong. I went ahead and set JointStereo back to 1 and then deleted the BitPools. Initial result was worse than before, but then I added sample of 48000 and ZERO skipping now!! Now my unit is perfect!!

[Wolf71]

Heeelp!! i got the uts ppc6700 and wm6 without extrom or else, i'm using the ad2p and results in a slow motion and interrupting sound, i tried everything (registry tweaks) and nothing results!, only way to get continuous sound is set the bitpool to 21 or lower, just imagine the poor sound!, there's a new patch for resolve it? please

[sethlo]

Originally Posted by edufur

OH MY GOD! Thanks Sethlo for kind of setting me straight. I checked both those articles and they are kind of in conflict with each other BUT they are both accurate in proving me wrong. I went ahead and set JointStereo back to 1 and then deleted the BitPools. Initial result was worse than before, but then I added sample of 48000 and ZERO skipping now!! Now my unit is perfect!!

As you probably noticed I incorrectly stated that the SampleRate should be 4800. I fixed my post above --- actually while experimenting, at some point I entered this wrong in my registry too. When it was entered wrong I got quite a bit of skipping. Then, after correcting the SampleRate DWORD by making it 48000, skipping is nearly completely eliminated for me. I do get a rare skip but when it happens it lasts for a fraction of a second. I am definitely hearing stereo separation out of JointStereo 1.

[store2000]

Guys, I'm having a weird situation. I can enable BT, pair with a stereo headset (Jabra BT620). BUT when I play any songs thru HTC audio manager, the songs are played thru the speaker (of the speakerphone).

I'm on the xv6700, helmi's WM6 (5.2.1620) and with Radio version 1.41. Wireless lan is off. No other software or hacks added. Am I missing something?

EDIT: Weird, I was playing with the "on/off/connect" buttons on the headset and suddenly it started working. I couldn't get the A2DP streaming when the connection was started by the WM6 device, but I could do so when the connection started from the headset.