Tata Sky HD is not sending 5.1 output via HDMI, as it should. Connect a coaxial cable from the coaxial output of the Tata Sky box to a coaxial input on your AVR.
If you want, you can connect the HDMI cable directly to your TV, as it will not make a difference if you route the signal through your AVR, since the audio will be carried anyways by the coaxial cable.
Optical cable will also do instead of coaxial.
If you want, you can connect the HDMI cable directly to your TV, as it will not make a difference if you route the signal through your AVR, since the audio will be carried anyways by the coaxial cable.
Optical cable will also do instead of coaxial.