Sony DVP-NS999ES - Manual (Page 18)

ES Series DVD-Video/CD/SA-CD Players; Version 3.0 Page 18
High speed video buffer amplifiers (DVP-NS999ES)
While Sony can control the video signal inside the DVP-NS999ES, there's
one aspect we can't control: the cables that convey the signal to your television.
In particular, the long cable runs found in many home theater installations can be
highly capacitive. This tends to degrade the video signal, softening the picture
and limiting the video bandwidth. To counter this possibility, Sony incorporates
high-speed video buffer amplifiers. High slew-rate op amps handle large loads
with very low overshoot. You get a powerful driving force for the video signals,
even over long cable runs. As a result, the video signal delivered to the
television has extremely low levels of noise, differential gain and differential
phase.
Block diagram of the DVP-NS999ES video circuit. You can see the
separate digital circuit board (left) and analog circuit board (right). At
center, you can see the nine channels of low-pass filtering. On the right
are the video buffer op amps.
Output Capacitor-Less (OCL) coupling (DVP-NS999ES)
In typical audio and video design, an output capacitor prevents the
accidental passing of DC offset voltage from one piece of equipment to the next.
However, the mere presence of the output capacitor can affect the video
frequency response and literally tinge the television picture with unwanted
shading. And these effects can't be corrected by your television's picture
controls. Sony's answer is a rigorous design that controls DC offset voltages