On Wed, Jul 25, 2012 at 2:10 PM, webmaster-Kracked_P_P <[email protected]> wrote: > On 07/24/2012 09:43 PM, Brian Barker wrote: >> >> At 09:16 24/07/2012 -0400, Tim Lungstrom wrote: >>> >>> Also the "lag time" for satellite can be up to 15 seconds from ground >>> station through a satellite to the ground station. >> >> >> Oh dear: the speed of light must have decreased by a factor of 63 since I >> was at school! Has someone told the scientific community? >> >> (The delay on the double journey to and from a geostationary satellite is >> about a quarter of a second.) >> >> Brian Barker >> >> > The lag time is due to the equipment, not the "travel time". > > I have both standard and digital cable boxes in my place. If I have both > TVs on the same channel, the digital TV has a 2 second lag for audio and > video than the non-digital TV's box. That is do to the time it takes to > convert the TV channel to the digital system and then the conversion back to > the coax cable going into the digital TV's coax input. Just in that simple > case, there is a lag due to the equipment involved. > > As for the time lag I gave you, that is the lag time given in my course in > telecommunication and communication networking. The problem is the > equipment's lag time doing the processing of the signal to be transmitted > and then the process of converting the signal back to the original format. > > > > -- > For unsubscribe instructions e-mail to: [email protected] > Problems? > http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ > Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette > List archive: http://listarchives.libreoffice.org/global/users/ > All messages sent to this list will be publicly archived and cannot be > deleted >
There are digital filters and delay's which 'could/should?' be added to these devices to compensate for the lag-time of one signal. It's similar to what they use in very large Audio PA systems when having very long cable runs. I even notice it when I go to my doctors, the surround speakers have a few hundred ms delay over the TV speakers which is quite disturbing. The mathematics involved however to 'auto-sense' something like that however is quite complex so even on YouTube videos for Sports like NASCAR et el.... I have to always adjust the speach delay manually in mplayer as it fluctuates. It is quite an interesting scientific phenomenon though, signal delay/lag and propagation through different mediums. Regards, Kaya -- For unsubscribe instructions e-mail to: [email protected] Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/global/users/ All messages sent to this list will be publicly archived and cannot be deleted
