I presume that the laser circuitry derives a digital signal from its optical inspection of the groove, which makes for the oportunity to do RIAA equalization and some pop and click elimination in the digital domain. But if the signal is digital, why bother with a mechanical recording media (vinyl) in the first place?
By the way, digital data can be recorded on vinyl, and played back with a normal phono pickup. At one time, on an experimental basis, stock market information was distributed this way, because a LP, once cut, can be rapidly reproduced by stamping out copies. At the time mag tape was the only other alternative, and mag tape takes time to copy because the tape must be drawn by the head. Digital data could use error correction encoding so that surface noise would not be a problem, but this digital approach would not work for music because the sample rate would be much too low.
By the way, digital data can be recorded on vinyl, and played back with a normal phono pickup. At one time, on an experimental basis, stock market information was distributed this way, because a LP, once cut, can be rapidly reproduced by stamping out copies. At the time mag tape was the only other alternative, and mag tape takes time to copy because the tape must be drawn by the head. Digital data could use error correction encoding so that surface noise would not be a problem, but this digital approach would not work for music because the sample rate would be much too low.