You are mistaken. Interpolation is "guessing" by definition (in this context) and interpolation is part of the CD standard.@yage was talking about 'error correction' and indeed that is done without guessing. There is a stage beyond error correction where the data's too corrupted to do error correction and that's normally termed 'error concealment'. Its at that point where interpolation - which indeed is a kind of guessing in this context - is used. Muting is the final stage where the data's too far gone even for interpolation/concealment.
how is digital sound created?
So sound is a vibration which is created from things rubbing or banging together etc. If stuff isn't interacting with something to create a sound how are sounds created from nothing? I.e in the digital world? Music on an iPod or a beep from a computer? I have always wondered what the noise's are and that come from computers when they are 'thinking' or working - wtf's going on there?