>Unfortunately, the digital lip sync issue is more complicated than it >would appear. In analog transmissions, the video and audio get processed >and transmitted at the same rates. With digital, video takes longer to >process than audio, and the delay is compensated for by most responsible >editors/engineers. But as soon as it hits the transmitter, a whole new >set of problems are introduced. Most broadcast transmissions are via >satellite and the number of hops that a signal takes is variable. Each >hop creates delays, usually with the video...
This suggests that the designers of the DTV formats were not thinking about this problem at the time the standard was developed. The multiple hop/transmission path problem was thought of when IP was designed. The Internet sends data in packets and there is nothing in the system that assures all packets in a stream are sent by the same route or even that all the sent packets arrive. So packets are numbered sequentially and when they get to your computer they are put in proper order. Missing packets may be requested and resent (or not). Looks like DTV is based on a more optimistic view of the world. ************************************************************************ * ==> QUICK LIST-COMMAND REFERENCE - Put the following commands in <== * ==> the body of an email & send 'em to: [EMAIL PROTECTED] <== * Join the list: SUBSCRIBE COMPUTERGUYS-L Your Name * Too much mail? Try Daily Digests command: SET COMPUTERGUYS-L DIGEST * Tired of the List? Unsubscribe command: SIGNOFF COMPUTERGUYS-L * New address? From OLD address send: CHANGE COMPUTERGUYS-L YourNewAddress * Need more help? Send mail to: [EMAIL PROTECTED] ************************************************************************ * List archive from 1/1/2000 is on the MARC http://marc.info/?l=computerguys-l * List archive at www.mail-archive.com/[email protected]/ * RSS at www.mail-archive.com/[email protected]/maillist.xml * Messages bearing the header "X-No-Archive: yes" will not be archived ************************************************************************
