IF my receiver will be able to make the signal (that comes via the 7.1 component outputs from a HD/BR player to my 7.1 input) digital via an ADC, than I can still apply room correction, BM, TA, and other DSPs to the signal and make advantage of my high end Denon receiver?
Correct. Once the signal is in the digital domain, you can treat it just like any other digital signal and use all the functionality of your receiver.
And as this works I will get THE EXACT SAME SQ (soundquality) as someone with HDMI input on their receiver.
Almost. You'll get the same functionality, not the same sound quality. Someone using the HDMI connection is sending the signal digitally to the receiver, thereby avoiding two conversion steps: D/A in the player and A/D in the receiver. Theoretically, each step has the potential to degrade the sound, though in practice the difference may end up being small or inaudible.
How can I find out if my Denon has ADC on the 7.1 input and how can I find out how good that ADC is?
The instruction manual should tell you whether it does A/D conversion of the multi-channel analogue inputs. The only way you can judge the quality of the A/D conversion is by listening for yourself.
Is it so that all the current receivers on the market with HDMI inputs can receive the lossless format or has the HDMI input has got to have some conditions before able to receive this signal?
Technically, the receiver isn't getting a "lossless format". It's receiving uncompressed PCM over HDMI. The term "lossless" usually refers to the signal being compressed without any bits being discarder (i.e., data packing).
Even amongst receivers that have the same version of HDMI, functionality varies. Some receivers act like simple switchers, routing the signal you selected but not doing anything with the audio. Others accept only 2-channel hi-resolution audio over HDMI. Still others are limited to 5.1 channels while some boast 7.1-channel input capability. That's the reason for this thread.
Probably I still do not see some things but maybe you guys will not be angry at me and can again take a look at my post and explain (not too technical ) why this thread has been made.........
Sander, you should never worry about anyone here getting angry at you. You're asking valid questions, and the answers help other people too. So keep asking, until the concepts are clear to you.