Brother airtel provide dolby digit from its hd service started time onwards.Now they are just show the logo of dolby(For the hd channel which have dolby ) in the new s/w version 502.They also provide dolby and dolby digit plus sound through hdmi in this new s/w version.
Following are the hd channels which have dolby in adtv
Star Plus HD - DD+
Colors HD - DD
Sony HD - DD
Star World HD-DD+
Star World Premiere HD-DD+
Star Gold HD-DD+
Star Movies HD- DD+
Movies Now HD-DD
Zee Studio HD-DD
Star Sports HD 1 - DD+
History TV 18 HD - DD
Nat Geo HD-DD+
Discovery HD-DD
M Tunes HD-DD
DD means Dolby Digit
DD+ means Dolby Digit Plus
If the broadcasters provide dolby sound adtv also provide it.
Thank You