Problems with voice files on Nokia 6600

[paultreadaway]

I'm trying to play voice sound files on a Nokia 6600 and I'm finding that some files only play partially and are truncated. This seems to apply to any file formats that are compressed to any reasonable degree (e.g. ADPCM or GSM 06.10 wavs; AMR; AMR-WB), but different files fail for different formats. Has anyone experienced anything similar? Any suggestions?

[meijerpb]

Maybe the problem is related to

http://discussion.forum.nokia.com/fo...threadid=43427

where I report truncation of short WAV format samples (one second, 8-bit, 22 kHz) on the Nokia 6600.

[paultreadaway]

Yes, it sounds like a similar problem. I understand there's a new version of the firmware due soon, so it will be interesting to see if this behaviour is still seen with the new version.

[enstedt]

Hi,

Could be something to do with the fact that the max. digital-to-analog sampling conversion provided by the 6600 is 16 kHz.

Best regards,
V / Forum Nokia

[meijerpb]

> Could be something to do with the fact that the max. digital-to-analog
> sampling conversion provided by the 6600 is 16 kHz.

Indeed using 16 kHz fixes the problem!! Thanks!

So apparently there is a bug in the automatic
sample rate conversion of the Nokia 6600 (if
there is any!), as I also had very bad results
with 11025 Hz. Sample rate conversion may result
in some loss of sound quality, but not in timing
differences. My firmware is v4.09.1, so I hope
the next firmware upgrade will ensure proper
sample rate conversion, because that is something
that the low level audio driver should take care
of. So basically I am for now forced to choose a
16 kHz sample rate? I tried 8 kHz thinking that
it would not cause sample truncation, but there
too I found incomplete sounds. It all looks like
the Nokia 6600 sound buffering/timing goes wrong
with most sound formats and short sound samples.
Only the 16 kHz seems to work correctly so far.

Peter Meijer

[meijerpb]

Indeed I now read in

Video_and_Streaming_in_Nokia_Phones_v1_0_en.pdf

> Note that maximum digital-to-analog sampling conversion provided
> by the Nokia 3650 device is 8 kHz; by the Nokia 6600 it is 16 kHz.

Of course, any sample rate conversion and aliasing
issues should never lead to changes in sound duration,
so there is still a bug in that area.

Peter Meijer

[siukay823]

I have written an application under Nokia 6600 that generate PCM output at 16k sampling rate. I have configured the audio output stream to accept 16k data by writting

SetAudioPropertiesL(TMdaAudioDataSettings::ESampleRate16000Hz,
TMdaAudioDataSettings::EChannelsMono));

But I found that it accept 8k sampling rate instead.
Any idea on it?

Thanks,