Thanks Robert for your reply. Then let me clear u fully.......
I have
1.sony smart android 3d tv, which has hdmi, hdmi arc, spdif, digital audio out port.
2. Set top box that has spdif digital, hdmi and rca port.
3. Siphon hdmi to hdmi converter that has spdif, hdmi out, rca L R, hdmi in arc...