If you have proper home theater system installed at your home with HD LCD then please check there is a port behind the dvd coaxial out, simply connect coaxial cable from HT to HD STB S/PDIF Port then press settings and select Home Cinema option in audio settings then you can see the dolby sound gets working.
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On the older HD boxes, you can get DD output via SPDIF output at the back of the STB.
On the newer STBs, HDMI seems to carry DD but what I have observed is it is still being recognised as a PCM 2.0 signal by my HT. When I connected the optical out of my STB to the HT, it was immediately recognised as a DD 3/2.1 (Dolby Digital 5.1) signal.
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