The ADD-01HDW connects to the SDI signal from your source equipment to your SDI receiver. With the simple interface of ADD-01HDW, the audio delay time can be adjusted so that sound and picture are perfectly synchronized. Up to 2700ms (2.7 second) error can be corrected. The digital audio signal is reproduced bit-perfect so no loss of audio quality is incurred. Also the ADD-01HDW can convert the SDI audio sound to analog or digital.