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ES DVD Players 2005, Version 4.0 Page 25
To maintain the purity of the signal, Sony places the analog video
circuitry on a separate board, driven by its own power supply.
Because digital noise can corrupt the DC voltage, the power supply is
another potential path of interference. That's why early on, Sony recognized the
advantage of giving the analog circuit block its own series power supply. This
ensures power that's both abundant and clean.
Video Shield Plate (NS9100ES)
DVD players process analog audio, analog video and digital signals in
close proximity, opening up the possibility of signal radiation and interference
even between circuit boards. To prevent even slight traces of interference, the
DVP-NS9100ES incorporates a shield underneath the analog video circuit board.
This protects the analog video from radiated interference from the digital video
board. It also limits the interference between analog video and the digital audio
board, which is located close by.
To minimize signal interference, the DVP-NS9100ES has a shield plate
fitted to the underside of the analog video circuit board.