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Post by srrndhound on Feb 15, 2014 1:44:57 GMT -5
ProLogic II is an old codec which was limited to four channels (L/C/R and mono surround) and is no longer used. You're referring not to Pro Logic II (2000), but original Pro Logic (1987). That one has indeed faded away. PLII is still in wide use for 5.1 systems. And just to clarify, it is not a codec. It's a surround processor. The core algorithm for PLIIx and PLIIz is identical to PLII, with certain additions for rear and height outputs. Both x and z can be set to output in 5.1 mode, which is identical to PLII.
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KeithL
Administrator
Posts: 9,962
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Post by KeithL on Apr 7, 2014 10:04:53 GMT -5
Let me take this opportunity to correct something which I stated somewhat in error....
The actual decoding coefficients for PLIIx are algebraic (they define what to add/subtract/etc) to get the required output, and so are "sample rate neutral" (they should work for any sample rate). It is the particular code implementation that we use in the UMC-200 that is limited to 96k for PLIIx.)
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Post by thrillcat on Apr 7, 2014 13:50:06 GMT -5
Dolby Pro Logic II converts 2.0 content to 5.1. Dolby Pro Logic IIx converts 2.0 or greater content to 5.1, 6.1 or 7.1 via surround back channels. Dolby Pro Logic IIz converts 2.0 or greater content to 5.1 or 7.1 via front height channels.
Basically, DPL II is rendered worthless on any hardware that is capable of DPL IIx. The UMC-200 spec sheet does not even list DPL II, only IIx and IIz. DPL II capabilities have been rolled into DPL IIx.
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