Request: Tehchnical information of audio out and screen [Archive] - maemo.org

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korbé

2009-09-04, 12:34

Hello everyone. :D

Yet I have searched, but there are two information on the N900 that I can't find.(even on the Nokia website):

- The screen can reproduce how many colors? 56k (like N810), 256k or 16M?

- What are the exact characteristics of the audio out on Jack 3.5mm? SNR, impedance min and max, frequency responses (15 to 20Khz?), Etc. ...
And very important: is there a little noise, a little "shhhh" as on the N810?

Does anyone know where I can find these information?

zerojay

2009-09-04, 12:42

And very important: is there a little noise, a little "shhhh" as on the N810?

I never noticed any noise from mine. I guess your best bet is to look at the Nokia official specifications. Beyond that, you'll have to wait until people here start receiving them.

korbé

2009-09-04, 13:03

He must have good hearing and good headphones to hear this noise on the N810.

Outside, with the ambiant noise it's dificult to hear this noise, but when there's silence ....

pH5

2009-09-04, 13:22

He must have good hearing and good headphones to hear this noise on the N810.
Make that "good hearing or good headphones".
Actually, make that "good hearing or low impedance headphones".

I tried listening to the N810 with old Ultimate Ears SuperFi 3 studio earphones, which only have 13 ohms impedance. It was impossible to use them without the included airplane adapter. The noise was very noticeable even at moderate volumes - felt a bit like listening to a walkie-talkie.

I have high hopes for the N900 because of the included (if we can trust the kernel sources (http://repository.maemo.org/pool/fremantle/free/k/kernel/kernel_2.6.28-20092713+0m5.diff.gz)) TPA6130A2 (http://focus.ti.com/docs/prod/folders/print/tpa6130a2.html) headphone amplifier. On the N810, volume control was purely on the digital side, causing much worse SNR with decreasing volume.

I'd love to see specs or reports about "ears-on" experience, too.

Andre Klapper

2009-09-04, 15:38

Yet I have searched, but there are two information on the N900 that I can't find.(even on the Nokia website):

You could file an enhancement request in bugs.maemo.org against maemo.nokia.com (one issue per report).[/QUOTE]

CyberCat

2009-09-04, 16:08

He must have good hearing and good headphones to hear this noise on the N810.

Outside, with the ambiant noise it's dificult to hear this noise, but when there's silence ....

Yeah, I've played music through my N810 on the monitors down at the studio and the hiss is definitely quite noticeable. Although the overall sound quality of the audio on the N810 is actually surprisingly good, even with super high-end equipment, if you're willing to over look that. A good work around is to keep the N810 volume low and amp the volume elsewhere with your equipment (assuming you have low S/N as well, of course :)).

I'm very anxious to hear about the N900's sound quality...

korbé

2009-09-10, 16:53

New information are there:

On the Nokia website, if you compare the N900 with another mobile by clicking on "Compare" (http://www.nokia.co.uk/find-products/compare-phones), you see.... you see...... :
Display colors: Up to 16 million colours

But, if there is no error on the website...

While waiting to have the technical details of the audio output, what testers of N900 think about the sound quality?

konttori

2009-09-10, 17:11

You can always use a BT headset with 3.5 jack, like nokia BH-214. I am not able to hear hiss on my current headphones from n900 though.

korbé

2009-09-10, 17:22

Can you try with a low impedance headphones?

Firebird8

2009-09-11, 00:35

Hmm, I thought the N810 had 16M color screen....

GeneralAntilles

2009-09-11, 02:11

Ari was apparently very aware of the audio shortcomings of earlier tablets and wanted to address them in the N900. Thus, the high-quality TI headphone amplifier. I doubt there will be any noticeable noise.

Sasler

2009-09-11, 13:45

I would like to receive clarifications to the aspect ratio of the N900. It has been mentioned several time that it has an aspect ratio of 16:9, but with the resolution of 800 x 480 equals to an aspect ratio of 1.67:1 and not the usual 1.78:1 (or 16:9). I believe that WVGA usually refers to 854 x 480 which has the correct 16:9 aspect ratio. But I could be wrong. ;)

Then again, the pixels might not be perfectly square or the spacing between the pixels might be slightly larger horizontally compared to vertical spacing. :)

Of course this is not very important at all, but I would like to know anyway. Obviously I could simply measure it from a picture of N900, but I'm much too lazy for that... :D

REMFwhoopitydo

2009-09-11, 15:05

Hmm, I thought the N810 had 16M color screen....

from my desktop computer knowledge, if they say; "up to 16M colours" then the screen is 6bit with dithering, whereas the statement; "provides 16.7M colours" indicates a true 8bit per colour channel screen.

GeneralAntilles

2009-09-11, 17:38

Sasler

2009-09-11, 19:06

Same as every other tablet, 15:9.

Thanks :)

So it means for 16:9 videos there will be small borders on top and bottom... Or maybe with a little zooming one could get rid of those.

Jaffa

2009-09-11, 23:11

So it means for 16:9 videos there will be small borders on top and bottom... Or maybe with a little zooming one could get rid of those.

If only there was some kind of software (http://mediautils.garage.maemo.org/tablet-encode.html) which made that straight forward ;-)

korbé

2009-09-18, 19:20

I have a question for those who have tested the N900:
What is the sound quality with in-ear headphones with an impedance of 16ohm?

korbé

2009-09-20, 22:35

On this monday morning, I up this thread with the hope I obtain a answer to my queston. :)