English to Bulgarian Other Cinema, Film, TV, Drama TV broadcasting

Commentary Circuits
Please Note that there will be a significant delay between the reception of ISDN commentary circuits and the vision. In order to help broadcasters synchronise both commentary and video we will include a clock over the test signal during the line-up period.
This vision will be available on the commentator's monitor so that they can synchronise video and audio during the line-up period with their respective CNCT's.
During the synchronisation tests between the Multilateral Vision and Commentary circuits the test tones will be for timing reference only. It is not possible to guarantee that the level on the ISDN commentary will match the level on the multilateral.