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RE: Question on Dolby Digital Signal Driving "Logic"

Posted by David Aiken on November 4, 2007 at 14:41:01:
I'm in Australia and I don't know what your off air HD broadcasting is like, or the quirks of your Onkyo receiver. There are certainly some quirks with my Denon receiver.

There's a difference between Dolby decoding and Dolby PLII. The first simply decodes the channels in the signal while the second processes the info in the channels that are there to generate info for channels not included in the original signal. It sounds to me as if your off air channels are broadcasting in stereo and your receiver is simply decoding the digital stereo signal to give you stereo. When you swap to analog inputs, you're taking a stereo signal and specifically telling the receiver to use Pro Logic processing to generate the extra channels. It sounds as if both processes are actually working properly.

What you obviously want is some way to tell the receiver to take the digital Dolby signal from the broadcast and to process it with Pro Logic as well as simply decoding it. There should be options for you to be able to do that but it will mean reading the manual. Hint: if you have the receiver set to apply Pro Logic processing to the Dolby bitstream from DVDs which only have a Dolby 2 channel soundtrack, you want to set it to do exactly the same thing for your off air broadcasts.

David Aiken