Whistling and crackling with HD channels with Dolby Digital audio

Bought 4 weeks ago unfortunately directly at Lindy and incl. High shipping paid about 30% more to Lindy Audio Converter. It's annoying, but nothing has of course to do with the quality of the product. Now this: I wanted the sound of my new Philips LCD TV (Philips 42PFL7606K / 02) to hear about my old stereo (high Camtech amplifier) ​​and required for the converter, because the system has no digital connection. Now the following peculiar: The sound of analog transmitter is in good quality, as described in the other reviews, to hear, but all HD channels provide first a whistling sound and then just a rattle on its own. I have now researched more. On the original webside of Lindy is now decidedly: "Supports uncompressed digital stereo audio input signals, for example PCM audio will not support compressed audio formats such as Dolby Digital, DTS, 5.1, etc. To this converter on your HDMI TV or on their digital. to operate home theater system, you need to set the sound output in the On Screen configuration menu to PCM or other uncompressed formats with the above sampling rates. " Where this is not possible (as unfortunately in my TV), is the sound of all HD channels that broadcast in Dolby Digital, can not be converted! So previously oriented !!