I'm guessing Time Warner. The sync issue is pretty wide spread and seems to be a problem for many providers. I'm thinking that quality was not a goal.
I recently upgrade our TV to a Sharp 3D TV which requires HDMI (previously used component video) to view 3D source from TW. Now the sound, which is to a Yamaha reciever through digitial optical audio, is ahead of the video on all channels. I have verified this as a TW problem by enabling the audio on the TV and my surround system and when set to TW I get an echo effect (the HDMI audio and video is in sync, but the HDMI video and digital audio are out of sync), but when set to my Blu-ray play with the same connection, there is no echo. TW has admitted via email that this is a problem which currently they do not have a resolution to. This is just a FYI for those of you that have this setup or plan to go to this setup in the future.