Discovery HD World Ku band satellite TV channel launched in February 2005, and It is a full HD picture format 1080i (HDTV). This Excellent picture quality satellite channel provides documentary programs like science, technology, history and culture. But If you are not receiving this channel Audio/sound, Its mean that this satellite TV channel broadcast in 1080i with Dolby 5.1 surround sound. So you must need to buy Dolby supported digital satellite receiver.
As you know Dolby Digital is a latest form of digital audio coding, It makes possible to provide high quality digital sound and you can you hear surround sound through your surround sound system. Now It is available in latest DVD-Video discs, DVD-ROM discs for computers, digital cable systems, direct broadcast satellite (DBS systems, and digital broadcast TV (DTV).
Famous Dolby Digital 5.1 surround sound Satellite TV receiver:
1- Bell Satellite TV receiver.
2- Cisco D9865 Satellite Receiver Dolby Digital.
3- Solid HDS2-2100 Full HD 1080p/i Dolby Digital MPEG4 DVB-S2 STB.
4- SOLID HDS2 9210 Dolby Digital Full HD 1080p/i.
5- SOLID HDS2 9300 Mpeg4 Full HD 1080p/i.
Finally if you want to fully enjoy Discovery HD World programs with audio sound support, then find a good Dolby supported digital satellite receiver. I have mentioned the above some good Dolby supported digital satellite receiver, hope that it will help you to find a good one.