Hello,

I want to encode my audio files generated with Brainwave Generator (http://www.bwgen.com/) to MP3 to use them with my Nokia 9500 mobile phone.

The question is, as these files are often high frequency sounds and audio compression cuts off these, what do you suggest how and what I should encode.

I've installed OggPlay on my Nokia, but mainly use it for MP3 files (http://symbianoggplay.sourceforge.net/OggPlayMain.htm) and I really do not know what would be better for these files.

OggPlay can supposedly play (haven't tested all of them):

*MP3, AAC, MP4, M4A, OGG

So, if someone can help me here with suggestion I would be very thankful for that.

I'm trying to encode to the old APS (need to try the new Lame with new VBR too)...

In the FAQ of Brainwave Generator MP3 compression is mentioned (http://www.bwgen.com/faq.htm#MP3COMPRESSION), but I would still like to know what format and preset would (for example if someone thinks/knows that format z is surely better for this) you suggest for exactly this kind of files (so no xy rules, please).

Thank you very much in advance for your time and answers!

Cheers,

Mijo

*edit for the moderators: As I ask for other suggestions too, maybe the MP3 general isn't the appropriate place, if you think it isn't please move the thread. I apologize in advance if I've posted it in the wrong place. Thanks. *

According to this page : http://www.bwgen.com/theory.htm , there is no high frequency at all in these sounds. They never exceed 1000 Hz.

I tested Lame with a sample made of -6 dB 400 / 410 Hz sines. Here is the discussion : http://www.hydrogenaudio.org/forums/index....showtopic=39514

The conclusion is that CBR is needed to encode properly these frequencies. However, Branwave itself should be used in order to confirm the results, because I used SoundForge to generate theoric files. Maybe Brainwave generates different files.

The command line to try can be
-b 160
-b 192
-b 256
-b 320

I only tested -b 320, which sounds OK, while the usual presets (-V2, -V0...) cause audible artifacts. I let you try the others.

high frequency as in what? 16khz? 19khz?

I think it is more important to encode the left and right channels independently, as said in its FAQ.

Hello,

thanks alot for all of your replies!

I always thought they are high frequency sounds in it, don't know where I got that from as that opinion is anchored for years in my brain . Sorry if I told something wrong in my explanation (will check the theory page et al).

Pio2001, thank you for your reply and link, especially the other thread gives me quite something to read! And thanks for your summary too, so I don't even have to read it .

To the others, also thanks for taking your time to read my post and reply to it...

And I also want to thank the producers, my mother, pet...

Cheers,

Mijo

Read the other thread : we saw that sometimes encoding them separately was better, and sometimes it was worse.

Does it, in conclusion, means that "Standard" preset is safe to use w/o artifacts?

henrywho, you need to read a bit more carefully:
"Standard" preset = -V2.

Regards,
Madrigal

EDIT: clarification

....... "-b 320 -m d" seems too harsh for my portable mp3 player.

....... VBR-new causes artifacts.

What about VBR-old and ABR?

What about them ? Do you have some results to share ?

Regards,
Madrigal

It is not wise to use the dual mono mode for stereo files.

It would be nice, if you can share a short example demonstrating the artifact with us. Then we may be able to fix it; or try 3.98alpha3, maybe the problem is solved already?

In addition to Pio2001's experience on pure waves, some "Binaural beat" clips are particularly difficult to encode because they add an amble amount of artificial noises.