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View Poll Results: Which samples sound (A or B) better, when decoded with certified DPLII deocers
Clips A sound better 0 0%
Clips B sound better 5 83.33%
Both sound the same 1 16.67%
Voters: 6. You may not vote on this poll

 
 
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Old 7th June 2006, 08:33   #1  |  Link
3dsnar
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Dolby Pro Logic II encoding test (90 vs 180 phase shift)

Here are two clips,
http://forum.videohelp.com/images/gu...165/180vs90.7z

And the reference (original 6 channel input) clip.
http://forum.videohelp.com/images/gu...helem_6chnl.7z

Each downmixed with:
Lt = FL{0} + 0.7071 C{0} + 0.7071 LFE{0} + 0.866 SL{180} + 0.5 SR{180}
Rt = FR{0} + 0.7071 C{0} + 0.7071 LFE{0} + 0.5 SL{0} + 0.866 SR{0}
and
Lt = FL{0} + 0.7071 C{0} + 0.7071 LFE{0} + 0.866 SL{90} + 0.5 SR{-90}
Rt = FR{0} + 0.7071 C{0} + 0.7071 LFE{0} + 0.5 SL{-90} + 0.866 SR{+90}

Please test them with your dolby certified decoders
and decide which ones sounds better (eg. A vs B version) with reference to the original sound.
The poll question is related to fifthelem_A.mp3 and fifthelem_B.mp3,
while speech_A.mp3 and speech_B.mp3 should sound identical
(to see that both downmixing methods are compatible with DPLII decoders)
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Last edited by 3dsnar; 7th June 2006 at 09:40.
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