Generating LFE-channel from Stereo Sound?

Generating LFE-channel from Stereo Sound?

[Thorsten Guenther]

Hi all!


First i would like to thank you for your great work. Yesterday i watched 
DVD and really enjoied doing so with 5.1 sound on my nforce2 Linux 
system. :-)))
After some hassle with the right settings for the DVD player software, 
anything works great and there is only one feature i'm missing:

In the Windows sound driver there is an option to generate an LFE 
channel from ordinary stero sound (e.g. MP3 playback). I searched the 
net and this list for some time but did not find any hints for player- 
or driver-options to do this. Am i missing something? Are there plans to 
add such a feature? May i help in some way (i'm a developer, but the 
java / server side type of) develop such a feature?

Tahnk's in advance!

Bye,
Thorsten



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Re: Generating LFE-channel from Stereo Sound?

[James Courtier-Dutton]

Thorsten Guenther wrote:
> Hi all!
> 
> 
> First i would like to thank you for your great work. Yesterday i watched 
> DVD and really enjoied doing so with 5.1 sound on my nforce2 Linux 
> system. :-)))
> After some hassle with the right settings for the DVD player software, 
> anything works great and there is only one feature i'm missing:
> 
> In the Windows sound driver there is an option to generate an LFE 
> channel from ordinary stero sound (e.g. MP3 playback). I searched the 
> net and this list for some time but did not find any hints for player- 
> or driver-options to do this. Am i missing something? Are there plans to 
> add such a feature? May i help in some way (i'm a developer, but the 
> java / server side type of) develop such a feature?
> 
> Tahnk's in advance!
> 
> Bye,
> Thorsten
> 
Converting stereo sound (2.0) to stereo with separate LFE (2.1) is best 
left to the media player, because high/low pass filters are CPU 
intensive, and would add too much delay in the audio out path, but can 
be done at the decoder stage, which is a stage in the media player 
before audio/video sync is attempted.

I don't know which media player you use, so I cannot comment further.

xine could support this by implementing a new audio_post_processing_plugin.
mplayer might already have this feature, look in the audio filters 
section of their manual.

Cheers
James


Cheers
James



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