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 0.7071
If unchecked value 0.0000
- Mix SL + SR ( ) (Option between) Mix SL - SR (x)
2) The generic matrix is:
Lt = FL + 0.7071*FC + A * SL + B * SR
Rt = FR + 0.7071*FC - B * SL - A * SR
When 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)
- 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.
@Matyas
Is 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