Think I have just twigged the difference.
Satellite has two tracks, you have to choose on or the other. For HD primary track is ac3 (2.0 or 5.1). AD track is 2.0 MP2 so replay will always be stereo.
Freeview-HD has two tracks AAC 2.0 or 5.1, AD track is mono only centre speaker only according to medianinfo.
Presumably selecting AD adds the audio and does not replace it.
grahamlthompson - 1 hour ago »
Presumably selecting AD adds the audio and does not replace it.
Yes, on freeview the AD does not replace the main audio.
What a freeview AD receiver/recorder does will vary according to the implementation.
Some implementations will just merge the 2 tracks.
Others will go one better and use flags from the AD track to variably subdue the main track so that the AD can be heard clearly. The louder the normal track is at that point the more the flags will indicate a required reduction of volume from the main track.
Humax do neither of those. Instead Humax perversely use the flags to reduce the volume of the AD track instead of the audio volume of the normal track. This frequently results in a muffled AD and occasionally when the normal track is loud the AD cannot be heard at all. Humax have been doing this on the HD-FOX-T2, HDR-FOX T2 and the HDR-2000T/1800T for all firmwares since April 2012.
Fred - 6 days ago »
While watching programs, we can hear a voice describing what is happening. This sometimes means that we cannot hear what is being said by the actors.
The AD track attempts to describe the necessary situation (which isn’t always what is on the screen!) when the normal sound track can be best sacrificed. If this occurs when the normal soundtrack is speaking it is usually because the normal sound track just contains just the semblance of speech, or the normal sound track is in a non-English language and therefore the AD will read the burnt in subtitles. Obviously with the latter on Humax freeview boxes it brings the foreign language to the fore instead of the English!
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