Originally Posted by blackssr
Did your source at Denon, specify what the reason is that the 7200 can not switch it up while bit streaming? Is it a hardware issue? Licensing Issue? or can it be added at a later date via firmware upgrade? This feature I would gladly pay for. It would make A-B testing really easy.
Here is my GUESS as to why this could be a problem.
From what I understand, the way the object audio is packed into the carrier is a deep part of the actual codec. The upmixer and renderer are all part of a routine running on the DSP chip. It has to break out the lossless audio into the 7.1 PCM before it can apply the upmixing. So let's say you have a computer that can open certain types of files and display them in Linux or Windows. Maybe the best format for the Linux setup has it's data on an EXT-2 formatted drive. It can open it and use all of it's tools and make the best use of the data. And can display it all correctly. Now you can also open and display a different type of file on a Windows system, stored on an NTFS drive and using a different type of packing. This system can also use all of it's tools on this data and display it properly. Both systems offer a lot of options on what to do with it's type of file, but they don't see each other. Before the update, there was room for a program on the "L" system to open the other file and make it so you could manipulate it and display it. Now you add all these new features to the "W" system and it takes a lot more resources to be able to run. The programs get too big to stay resident all the time, so if it has Brand "L" code running, it can open that file format and use the data and display, but not the Brand "W" anymore. When you switch modes, which may only take a second to swap out some code in the DSP ram, now it can open and manipulate the "W" type of file and and manipulate display that data, but it had to stop the code that could see the "L" style data. Both types of code have the ability to play a raw format, let's say a drive formatted FAT-32 (our stand in for PCM) to keep the computer file analogy going. This will let either run a simpler type of file with less information, but they can both do some manipulation and display the data, and even do some up mixing from it.
I may be totally wrong, but knowing that the codec to retrive the PCM out of the lossless codec is not a small task would actually explain why you can't be running both types of code at the same time. When you split it up and have the Blu Ray player strip it out to plain old PCM, now it can see the basic raw data and process it any way you like. This does not look political or trying to hose you, I think it might just be the only way they were able to jam all the code into the DSP in the AVR's. It is possible that future AVR's that have some more DSP power and memory just might be able to read the other codec and apply their upmixing, but at this point, just go to PCM when you need to do that.
I really think it is a non issue. If you are comparing native immersive audio,you have to change the player settings or even the disk and there is no content at this time coded in both formats to be able to do a true A/B comparison in the bit stream world. To do A/B comparisons of the upmixer, you just put the player in PCM, no big deal.