what happens to PCM when it is processed by DTS or Dolby?

I know PCM is a compressed series of 1s and zeros and is a process for converting analog to digital.  And then it reaches dts or dolby processing.  What happens?  I kinda like dts neural x vs dolby surround which seems inferior.   Using a NAD processor.

seems most stuff coming into a processor is pcm.  
hard to find a good writeup to explain all this
PCM cannot be processed by DTS or Dolby Digital.  Both DTS and Dolby Digital are proprietary multi-channel encoding formats.  They are like a different language.

PCM is also NOT a compressed series of ones and zeroes.  It is uncompressed raw 2-channel data of the music in the original sampling format (such as 16 bit / 44.1 khz or 24 bit / 96 khz).

However, I think you are talking about surround decoding processes for music.  The "DTS Neural" and "Dolby Pro Logic" are processes that try to translate 2-channel audio into a multi-channel output.  I don't think anyone here can further explain in detail what happens because it's a lot of rocket science math.  You should probably google more on that specific format, such as "DTS Neural".
Decoding was key word.

so pcm is decoded into dts neural or dolby pro, which is essential i guess if u want to have tv audio to flow thru a center channel, otherwise it would all be two channel listening.

All stuff coming thru cable is two channel, and then decoded or processed to spread it to multiple channels.  Crappy stuff i guess.

Netflix, youtube  is pcm or two channel , hbo max and disney are dolby atmos

so netflix is crappy, sad

Am i getting this right?

thanks, great expl

Decoded is not the right work.  "PCM" does not decode to a surround format.  It's more like "translated".  It's artificially creating a surround type music experience from 2-channel audio.  It's like "PCM" is like a picture of a two trees in front of you.  Then you as an artist need to imagine what it looks like in the middle of a forest.  That's what these DTS Neural and Dolby Music surround modes try to do.

Netflix can be PCM 2-channel or 5.1 Dolby Digital depending on the show.

HBO Max and Disney are not Dolby Atmos.  Most likely, they are all just Dolby Digital.

Anything coming through cable or satellite is usually Dolby Digital.