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K750i: Stereo Bluetooth Headsets? |
DennyL
Joined: Jul 22, 2005
Posts: 13
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There is an article in the current Personal Computer World magazine (p21) saying that Stereo Bluetooth headsets to a new standard called 'A2DP' (Advanced Audio Digital Profile) are starting to appear. These have a data-rate capability of 3Mbits/sec, and should be OK for music. It says in the article that the W800i is A2DP-enabled. Doesn't this mean that the K750i is A2DP-enabled, as it can be flashed to W800i? Does anyone know anything about A2DP headphones, or even have a pair that they can tell us about? |
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happycheesecake
Joined: Jul 30, 2004
Posts: 344
From: Northampton, England
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I don't think it does. Here's the list of Bluetooth profiles supported by the K750i:
•Dial-up Networking Profile
•Generic Access Profile
•Generic Object Exchange Profile
•Object Push Profile
•Serial Port Profile
•Handsfree Profile
•Headset Profile
•Synchronization Profile
•Basic Imaging Profile
•File Transfer Profile
•Human Interface Device (HID) Profile
•SyncML OBEX binding
•JSR-82 Java API
The details are available in a PDF available here: http://developer.sonyericsson.com/getDocument.do?docId=70824
...Silver Xperia Arc, 32GB SD card... |
s0real
Joined: Jun 15, 2005
Posts: 47
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i had a aquick look at the white paper on the w800i and it mentions nothing about ad2p... is it definately supported on the w800? |
abe2000
Joined: Jan 08, 2005
Posts: 51
From: Sweden
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Isn't that the Headset Profile? (not Handsfree Profile) |
happycheesecake
Joined: Jul 30, 2004
Posts: 344
From: Northampton, England
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I don't think the headset profile is the same as the A2DP profile. According to the Bluetooth V2 specs, A2DP is mentioned in the list of available profiles as well as the headset profile...
That suggests to me that they are seperate profiles...
...Silver Xperia Arc, 32GB SD card... |
Itanium
Joined: Jun 13, 2005
Posts: 77
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Headset and handsfree profile are differnt from A2DP (Advanced Audio Delivery Profile).
A2DP is relatively newer and is included in BT2.0 specs.
AFAIK, Neither K750 nor W800 has implementation of this profile. As for talking about support, this is a totally software implementation issue so theoretically above said phones can have it in future. But at the moment that is not the case and I really don't see it happening. The way commercial companies work, they will include it in say K800 or W850 or something  |
gelfen
Joined: Nov 22, 2003
Posts: > 500
From: Melbourne, Australia
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it is highly unlikely to be added to a future firmware. SE rarely adds a functionality upgrade to firmware updates.
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DennyL
Joined: Jul 22, 2005
Posts: 13
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This says it's compatible with the K750i, FWIW. Looks very temptiing.
http://www.expansys.com/product.asp?code=119598 |
jcwhite_uk
Joined: Feb 18, 2004
Posts: > 500
From: Dorset, UK Phone:Xperia Z1
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It also lists the K700 which is definately not compatible with it. It will probably work as a bluetooth headset but not to listen to music or in stereo. |
batesie
Joined: Feb 13, 2004
Posts: > 500
From: London, UK
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bluetooth can only just handle 2 way conversations, i doubt a high quality audio track can be seamlessly streamed via bluetooth without comprimising battery life/and/or/quality
[addsig] |
carkitter
Joined: Apr 29, 2005
Posts: > 500
From: Auckland, NZ
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@jc
Why wouldn't it work in stereo with the K700i handsfree profile over B/T 1.1?
Both my HCH-15 and SE (plug in) headphones use K700i handsfree profile.
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Itanium
Joined: Jun 13, 2005
Posts: 77
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Most of the people are missing the point here. These headphones might connect very well with the phone and might work perfectly for calls. You might also be able to hear the incoming call voice from both the earpieces too, BUT, now pay attention here, voice calls are not stereo. So is a mono channel sound data is heard over 2 earpieces, it doesn't make it stereo.
Now to the 2nd and more important point. K750 and all previous models support headset and handsfree profiles only. A2DP (Advanced Audio Delivery Profile) is not implemented in these phone's bluetooth stack. That essentially means that you won't be able to transmit sound from media player to these (or any bluetooth stereo headset for that matter).
You can invest money in these and can use it to make and attend calls but forget about listening to music with these and K750.
And ya as for talking about bandwidth available to trasmit good enough amount of music data over bluetooth, yes it was not possible until bluetooth 1.2. But the latest bluetooth 2 specs have much higher bandwidth available and hence can transmit stereo music data over the air. You might also want to make note that bluetooth and Wifi (a.k.a. 802.11), which has quite high bandwidth, use same frequency spectrum to transmit data, meaning that its not the transmitting medium that restricts anything, but the protocol specifications itself that has limitations. |
Iondah
Joined: Sep 07, 2005
Posts: 8
From: Australia
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Ok. What Itanium makes sense, BUT. I've been looking all over the net trying to find out whether the K750i will work with an A2DP device or not. The fact that there is no mention of the A2DP profile in the K750i whitepages doesn't seem conclusive. For a start, the A2DP profile is included in the GAVDP (General Audio/Video Distribution Profile). Both of which are included in the BT 1.2 profile stack. Logic would suggest then, that any device which is BT 1.2 compliant can handle A2DP. But I'm not 100% on that because I haven't tried. I'm seriously considering ordering an A2DP adapter just to try it out and put an end to this.
The other thing I'd like to mention is with regard to someone's comment that the only SE handset to support A2DP is the P910. I looked through the whitepages of every single SE handset on the market at the moment for a mention of the A2DP profile and there is none. Even the GAVDP isn't mentioned in the Z800i which obviously has both in order to have 3G video and stereo capabilities. Therefore the fact that it is omitted from the whitepages doesn't seem to mean anything.
A2DP has been around for a while now, and while the K750i is BT 2.0 complient and SE was one of the original contributors to BT it seems odd that such a media oriented phone wouldn't support A2DP.
If anyone wants to make a donation I'll order a pair of A2DP BT headphones off Ebay today... unfortunately $100 seems a bit steap to buy just for the hell of it when it might not work.  |
Iondah
Joined: Sep 07, 2005
Posts: 8
From: Australia
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Bad news:
http://developer.sonyericsson[....]null&forumId=13&readOnly=false
That doesn't sound promising to me! :'(
I guess we pray for a Firmware upgrade.
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Aussie Blue Boy
Joined: Aug 17, 2003
Posts: 84
From: Melbourne, DownUnder
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Yeah, I'm not real happy that the A2DP profile isn't in the K750i either.
Particularly as I've been itching to get my hands on this sensational looking headset...
http://www.bluetake.com/Products/BT420EX.htm
So please, please, please S-E give us a firmware upgrade that includes this profile!!!
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Posted: 2005-08-23 17:02
