An SDI Input is mandatory for IDC 1411 to implement dialogue cleaner, filter and amplifier, on AES Audio. If no SDI Input is present, the IDC 1411 will not be able to Embed, Process and output any AES Audio.

Processing Delay:

The timing of the SDI and AES Output will be locked to the SDI Input. Additional
delay introduced by the audio processing will be compensated depending on
the video refresh-rate resulting in the following input to output delay.