Lt = FL + 0.7071*FC + A * SL + B * SRRt = FR + 0.7071*FC - B * SL - A * SR
- Downmix: A = 0.8165, Mix SL-SR FS: A = 0.8165, Music Mode (0,0) (Default FS)- Downmix: A = 0.8660, Mix SL+SR FS: A = 0.8660, PowerDVD comp. (0,180)- Downmix: A = -0.8660, Mix SL+SR FS: A = 0.8660, BeSweet comp. (180,0)
Now this is awesome.But to understand it right: This DSP downmixes my 5.1 channel AC3 48kHz, into 2 channel MP3 so that I won't loose _almost_ any channel information, and I will be able to "upmix" it into 5.1 channel with fsurround?What's the level of lost information (not considering the lost info during lossy-lossy recoding?)So in this case it is much better than foo_dsp_channelmixer, because it allows you to go back to 5.1?
1) Propossed controls for left panel 'Mixing coeficients' of 'Downmix AC3/DTS to PL2'- ProLogic compatibility [CheckBox] (default checked)If checked Front, Center, LFE, Surround B values not accesibles (grayed)- LFE Enabled [CheckBox] (default unchecked)If checked default value 0.7071If unchecked value 0.0000- Mix SL + SR ( ) (Option between) Mix SL - SR (x)2) The generic matrix is:Code: [Select]Lt = FL + 0.7071*FC + A * SL + B * SRRt = FR + 0.7071*FC - B * SL - A * SRWhen ProLogic compatibility checked:B = sign(MIX_SL_SR) * sign(A) * sqr(1 - A * A)3) Values required to recover the exact channels test with Free Surround (Center Image = 1.0, Simple and Non-Linear)Code: [Select]- Downmix: A = 0.8165, Mix SL-SR FS: A = 0.8165, Music Mode (0,0) (Default FS)- Downmix: A = 0.8660, Mix SL+SR FS: A = 0.8660, PowerDVD comp. (0,180)- Downmix: A = -0.8660, Mix SL+SR FS: A = 0.8660, BeSweet comp. (180,0)With A = 0.7071, B = 0.7071 and we have dpl I.@MatyasIs better than other foo_mixers if we listen through an audio equipment with dpl decoder (attached to PC or standalone player). To listen through headphones or stereo speakers maybe other mixers can be similar or better.With channel test (each channel separated in time) we can recover the 5 channels with error less than 0.0002. Of course with real sound is not true and is dependent of the relations between the source channels.For instance, if left and right channel have a common sound is recovered at center channel
Mix SL - SR (x): Why do we need this? To be able to model SQ encoding, too?
Quote from: pro_optimizer on 21 February, 2007, 01:50:38 PMMix SL - SR (x): Why do we need this? To be able to model SQ encoding, too?The default FS mode: Music Mode (0,0) need a initial downmix with Mix SL-SR.And other people also experiment with this kind of mixes, this is a old discussion.Really for me is not necessary but maybe you need change the default FS.
When I do the comparisons via headphones, each of the chains is followed by Dolby Headphone -> SRC Resampler(96000) -> Convolver(Eq)
Why do you use the SSRC resampler to go up to 96kHz? And what's the point behind using Convolver instead of the built-in EQ?
@EQ: Thanks for the link.@SSRC: the question is not why SSRC, but why do you need 96Khz before the EQ which anyway goes directly to your headphones. Isn't 44kHz enough in this case?
For any Reason, this Plugin doesnt Work here...Its loadable, but every File which leaves the Converter (Wav Output) is still a 5 Channel WAV.Even if i Change the "Master Gain" in the Configuration Dialog , nothing Happens.Can someone help me?
the library:libfftw3f-3.dll for windows .. where do I have to install it ? In what directory please ?
Is it possible to encode in Pro logic IIx and IIz ? Or is it too soon ?
Quote from: -Tiziano- on 31 December, 2009, 04:41:38 AMthe library:libfftw3f-3.dll for windows .. where do I have to install it ? In what directory please ?In foobar's installation folderQuote from: -Tiziano- on 31 December, 2009, 04:41:38 AMIs it possible to encode in Pro logic IIx and IIz ? Or is it too soon ?I posted you link in your own thread: http://www.hydrogenaudio.org/forums/index....showtopic=50713
PL2XDLL.dll and libfftw3f-3.dll in main foobar folder, other .dlls in components folder about converting, you have DSP window in processing tab of converter dialog
Do you want to upmix or downmix?You can use matrix mixer if you know the matrix for DPL IIxIf you don't know the matrix you can try with DPL II upmix to 5.1 and then use matrix mixer for other 2 channels, like this for example:[a href="http://img685.imageshack.us/img685/5695/sshot6u.png" target="_blank"]
I tried downmixing 8ch with ffdshow Dolby Prologic II and this is the matrixSL and SR aren't downmixedThe stereo effect is similar to what downmixer component from this thread is doing, so try itCyberLink downmixes very differently: back and side channels are exclusively at corresponding front channels