I have discovered significant, severe distortion when playing back audio on N810. At first i thought it was hardware (amp, speakers) however when i installed a newer esd client, the startup sound (synthesized) was loud and CLEAR.

In my tests so far, the worst distortion has occurred with mp3s through dspsink. Also mediaplayer is reducing volume by some 12dB compared to mplayer/xmms. Xmms so far seems to have least sound problems.

The audio problems sound a bit like digital distortion introduced somewhere. Also there is significant resampling degradation between 44khz and 48khz samples (.wav).

It's clearly a software issue, and one that must be resolved.

Update:
It works great !
All I had to do was restart the tablet. Was it mention in the instructions ?

Works amazing with Motorola S9 Bluetooth headset. Somehow the volume is louder than the speakers which is good considering the low output levels of internet tablet (770 and 800 no idea abt 810 )
Thanks for all the great work.

Hi,
Have you solved your problem. I am trying to do the same but doesnt seem to work and gives the same exact error.

Cheers

""""""""""""""""""""""-The A2DP HowTo-

1. Pair your A2DP headphones.
2. Click on the Bluetooth "B" icon in the status bar, then "Bluetooth settings..." -> Devices. Select your headphones from the list and click "Edit." Carefully write down (on a piece of paper or on your computer, not your tablet) the letters and numbers you see next to "Bluetooth address:" Mine is 00:07:A4:B6:F9:71 for reference.
NOTE: The colons ":" are important. Write those down too! The only characters you will see are the numbers 0 through 9 and the letters A through F. No need to worry whether you're seeing an I or a 1, an O or a 0.
3. Download and install rm_you's package of mplayer, with a small patch that modifies how buffering is done: here.
4. Download and install the a2dp-support package attached to this post. Current version is 0.9.
5. Open up "X Terminal" and run:
Code:

a2dp runfirst

6. It will ask you for the Bluetooth address of your headphones which you wrote down earlier. Type that in exactly as it was shown and hit enter.
7. To enable a2dp support type:
Code:

a2dp enable

8. Now anything that uses mplayer (such as mediabox or kagu) will try to play through your bluetooth headphones! To switch things back to normal and make mplayer play through speakers/wired headphones just type:
Code:

a2dp disable

Bonus: Don't like using the terminal to switch modes? Download and install osso-statusbar-cpu from here. Once it's loaded and running in the statusbar, tap on it, then "Settings" -> "Commands" -> "New." For "Description put "Toggle A2dp" and for Command type:
Code:

a2dp toggle

Now you can toggle a2dp on and off just by tapping the cpu-statusbar app then "Toggle A2DP"!""""""""""""""""""""""""



HELLO GUYS I TRIED DOING THIS BUT I CAN HEAR ONLY MONO SOUND FROM MY NOKIA BH601 STEREO HEADPHONES. i UNDERSTAND THAT IT IS STILL IN HSP PROFILE.... SO ANY IDEAS AS TO WHAT I COULD HAVE DONE WRONG??

THA NKS

Make sure your audio player software is using mplayer. For example, in Kagu settings you can select "mplayer" or "osso".

@Johnx

Maybe you could update your 1st post to mention to use Serge's new release of mplayer test5 instead?

rm_you got Serge to add the buffering patch into the official release.

Is there a way use A2DP the other way around on a N800? That is, use a N800 as a bluetooth headset.

I have a Nokia N75 and while I love it, I absolutely hate the Pop-Port in order to use a headset/headphones and USB connectivity. I have the latter solved by using the Blutooth File Transfer Protocal. Since I carry around my N800 often, it would be nice if I could use the Headset Profile and A2DP with my N75.

Did and re-did and triple checked every step of the instructions and it just doesn't work on my N810, always get the crappy lo-fi mono sound out of 2 different BT stereo headsets I have (Motorola s805, Plantronics).

Any idea ?

Same here.

I just went through all my instructions on a fresh flash of OS2008 (50-2). The one thing I can think of is that you definitely need to reboot. Also if you have the charger plugged in when you attempt to "Switch off!" it won't actually switch all the way off. Unplug the charger, switch off, turn back on, plug charger in and see if that works. I really don't have any more ideas about this, but maybe if you could show me the output mplayer gives, I might be able to help.

-John

i have a sony MEX-BT5000 in my car. while trying to pair the cd player with an unmodified N810. i encountered some wierd scenarios.

1) initiate pairing from cd player - able to find N810, but after keying in keypass on both cd player and N810, cd player shows failure. MEX-BT5000 does not get added to N810 bluetooth devices list.

2) initiate pairing from N810 - fails after keying in keypass.

i am using keypass as "0000" for MEX-BT5000 and "1234" for N810. anyone have any idea how to make the 2 devices pair up before i modify the N810 for A2DP?

my understanding is that both devices should pair up without any problem, but sound transmitted to the cd player would be terrible. from there i work on the A2DP "solution" as described in this thread. is this correct?