The LT443D-DA Digital Audio Module fits into the LT443D main frame and generates digital audio test signals. 4 pairs of AES/EBU audio signals are provided for a total of 8 channels; each pair is output onto a 75 Ohm BNC. Output level, frequency and audio click can be independently set for each output. Digital audio level can be swung from -60 to 0 dBFS and it is settable in 1dB steps. Test tones can be set from 50Hz to 20KHz (30 fixed steps) and silence. Sampling frequency is fixed at 48KHz and it is synced to the video signal from the LT443D; audio to video timing can be varied. 20 and 24 bit resolutions are supported. The module also provides a word clock output, as well, a separate output (1 BNC, 2 channels) of silence signal (DARS grade 2) is also provided.