This is good news for DD Freedish viewers that Prasar Bharti started Dolby Digital+ (AC3) audio feed for DD News HD and DD National HD channels. This tutorial will let you know how to enable Dolby Digital Plus Audio in DD Freedish HD channels.
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How to get HD channels in DD Freedish Set-Top Box?

If you have free to air HD set-top box, and if you are not getting DD News HD and DD National HD channels then you can tune your set-top box given below frequency or satellite parameters. Don't try to get HD channels in your old MPEG-2 set-top box, because that is the unsupported set-top box for HD channels.
How to get HD channels on DD Freedish DTH?

How to enable Dolby Digital Plus Audio in DD News HD and DD National HD?

Know how to edit a channel language in Hindi for DD free dish?

After scanning your box, if you have received both channels in your "TV Channels" list, then directly go to the channel.

Now from your remote control, find "Audio" button and press this button then you will get two options in audio. So you can see there are two audio feeds available.
First one is normal stereo (MP1) sound and second is Dolby Digital Plus.
dolby digital plus advanced audio enable from remote

How to feel or enjoy Dolby Digital Sound for DD Freedish Channels?

At this time, Dolby Digital Plus audio available only for two channels, you can enable Dolby Sound by given above instructions.
To feel Dolby digital sound in both channels, just connect your HDMI cable to Dolby Digital supported a TV or Dolby Digital supported home theater system.

dolby digital plus audio feed added on DD News HD Channel

If you want to know more about dish antenna and set-top box installation, check all information from here.