On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > Prolonged blacks can damage television transmitters, however (video > is inverted for transmission, so black requires full power from the > transmitter). Why is video inverted for transmission?
Why is video inverted for transmission?
Started by ●September 19, 2007
Reply by ●September 19, 20072007-09-19
On Sep 19, 5:58 pm, "Green Xenon [Radium]" <gluceg...@excite.com> wrote:> On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote inhttp://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8e...: > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > > Why is video inverted for transmission?Blackness is darkness. Sith Lords were and are in control of the FCC. "All slaves have a transmitter placed somewhere in their body." -- Shmi Skywalker
Reply by ●September 19, 20072007-09-19
On Wed, 19 Sep 2007 17:58:23 -0700, "Green Xenon [Radium]" <glucegen1@excite.com> wrote:>On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in >http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > >Why is video inverted for transmission?So black, which is the sync pulse, which is the retrace blanking, gets lots of transmit power, so things tend to stay in sync. Max-black also make dc restoration work nicely. John
Reply by ●September 19, 20072007-09-19
On Wed, 19 Sep 2007 17:58:23 -0700, "Green Xenon [Radium]" <glucegen1@excite.com> wrote:>On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in >http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > >Why is video inverted for transmission?So black, which is the sync pulse, which is the retrace blanking, gets lots of transmit power, so things tend to stay in sync. Max-black also make dc restoration work nicely. John
Reply by ●September 19, 20072007-09-19
On Wed, 19 Sep 2007 17:58:23 -0700, "Green Xenon [Radium]" <glucegen1@excite.com> wrote:>On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in >http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > >Why is video inverted for transmission?So black, which is the sync pulse, which is the retrace blanking, gets lots of transmit power, so things tend to stay in sync. Max-black also make dc restoration work nicely. John
Reply by ●September 19, 20072007-09-19
On Wed, 19 Sep 2007 17:58:23 -0700, "Green Xenon [Radium]" <glucegen1@excite.com> wrote:>On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in >http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > >Why is video inverted for transmission?So black, which is the sync pulse, which is the retrace blanking, gets lots of transmit power, so things tend to stay in sync. Max-black also make dc restoration work nicely. John
Reply by ●September 19, 20072007-09-19
On Wed, 19 Sep 2007 17:58:23 -0700, "Green Xenon [Radium]" <glucegen1@excite.com> wrote:>On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in >http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > >Why is video inverted for transmission?So black, which is the sync pulse, which is the retrace blanking, gets lots of transmit power, so things tend to stay in sync. Max-black also make dc restoration work nicely. John
Reply by ●September 19, 20072007-09-19
On Wed, 19 Sep 2007 17:58:23 -0700, "Green Xenon [Radium]" <glucegen1@excite.com> wrote:>On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in >http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > >Why is video inverted for transmission?So black, which is the sync pulse, which is the retrace blanking, gets lots of transmit power, so things tend to stay in sync. Max-black also make dc restoration work nicely. John
Reply by ●September 19, 20072007-09-19
On Wed, 19 Sep 2007 17:58:23 -0700, "Green Xenon [Radium]" <glucegen1@excite.com> wrote:>On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote in >http://groups.google.com/group/sci.electronics.basics/msg/6689f0d1e8eff770 : > > > Prolonged blacks can damage television transmitters, however (video > > is inverted for transmission, so black requires full power from the > > transmitter). > >Why is video inverted for transmission?Noise in the black portion shows up more than in the white. Black is transmitted at higher power, more received signal. less noise.
Reply by ●September 19, 20072007-09-19
"Charles" wrote ...>>Why is video inverted for transmission? > > Noise in the black portion shows up more than in the white. Black is > transmitted at higher power, more received signal. less noise.Yes, that is my recollection of the original explanation by the engineers & scientists who devised the system. We tend to forget how primitive things were back then (>50 years ago) by modern standards. I can't believe what they did with vacuum tubes ("valves") in those days.
