Quantum Error
In tape recording there is something called SNR meaning signal to noise ratio. What this entails is that when the signal is recorded it also gathers a tape hiss along with it if the tape is recorded at a high speed the signal is longer on the tape making the signal sound higher and the tape hiss noise lower giving the audio engineer a stronger signal making the recoding of music clearer. When recoding went to digital they thought that they would end the noise altogether with a clean digital signal however digital signals are square and analog sound are round and curvy so what happens in between the curves is the tail end of the square edge which makes a noise called quantumized error.