I had a doubt in my mind regarding the orders of sampling and quantization in PCM. What is the impact if the order is reversed, that is, the continuous time signal is first quantized and then sampled? I find a source on the internet claiming that quantization noise will increase with the reversal (link given), but I'm not sure why. Personally, I feel it should be unaffected as we're simply quantizing as in allowing a finite set of amplitudes first and then sampling those amplitudes. Am I missing something?
Link which claims the same: (Question 16)