This Recommendation provides methods for synchronizing interconnected digital audio equipment@ and to address synchronization of the audio sample clocks to video reference signals. Synchronization of digital audio signals is a necessary function for the exchange of signals between equipment. The objective of synchronization is primarily to time align sample clocks within digital audio signal sources and align them with video frames/fields. The provisions make use of the two-channel digital audio interface standard for professional use@ Recommendation ITU-R BS.647.