It worked.
The sound of the TV, the receiver is now over, okay. The audio signal from the PC is forwarded without humming.
Mission accomplished.
Dolby Something can not the part. But I wanted to do neither. The receiver has two wonderful Canton speakers, all I need. I was referring to television and PC Sound. Both I have now, no hum or noise, which does not belong there.
Audiophile people like the look safe from a different angle. For there are suitable devices from 400 who certainly their advantage. Ultimately a question of the right - as so often.
My conclusion: With little money achieved a lot.
I am happy.