I am sure there is someone who can explain this. If you listen to the start of channel 5"s newscast you will hear about a second or two of a live mice picking up air-conditioning?. Then the voice over guy and the opening fanfare. I doubt it can be an AGC unit sucking the background studio noise because no one is talking because the first word is not distorted and at a near perfect level. If it is the anchor's microphone why is it on before the opening fanfare? Some one could cough, sneeze, clear their throat or worse last minute directions yelled at the anchor. BTW you don't hear it during the newscast. Non of the other news operations do not have the 1 or 2 seconds of "studio noise" before their intro.
IMHO: If they are using computer based switching the anchor's audio should not come on until after the prerecorded intro.
IMHO: If they are using computer based switching the anchor's audio should not come on until after the prerecorded intro.