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RE: Question on Dolby Digital Signal Driving "Logic"

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In Reply to: RE: Question on Dolby Digital Signal Driving "Logic" posted by David Aiken on November 04, 2007 at 14:41:01

Hi,

Thanks for the response. You're post made me realize what the problem is - it's my SONY TV!! The off-air signal is routed directly to the TV from my attic antenna, and even though I'm going optical to the Onkyo A/V receiver the TV only passes 2-channel stereo, but it must be Dolby Digital stereo. Presently I am using an analog connection as well and that is what I use with the Pro Logic II to generate the 5.1 output. Works really well, and I am just going to stick with that. Geez, you would think that SONY would recognize the need to at least pass through a 5.1 digital signal but they don't. The manual sez 2-channel only.

BTW, the Onkyo doesn't have any quirks, AFAIK. I bought a DENON A/V for my son, and while it performs nicely (it's a cheaper model, 75wpc I think) it is VERY difficult to set-up and use. Really confusing. Oh well.

Thanks again, Joe

Follow Ups:

RE: Question on Dolby Digital Signal Driving "Logic" - David Aiken 21:56:55 11/04/07 (0)
Are you sure the problem is the Sony TV? Here in Australia most hi-def off air broadcasts are only stereo anyway. I've yet to come across a 5.1 broadcast signal and I don't know how my set-top box would handle that. One day I may find out but all my local off air broadcasts seem to be stereo only.

If the TV is passing the signal in bitstream, I would have thought it would simply be passing the signal it receives, not converting it to stereo. If it's converting a surround signal to stereo and passing a stereo bitstream, then it's decoding the original bitstream, downmixing to stereo, then re-encoding into a Dolby bitstream and I don't think any TVs do that. If the TV is passing the signal in PCM, then it could be downmixing but then the receiver should show the signal as PCM, not Dolby, since the Dolby decoding has already been done and it's no longer in that format.

If the TV gives you the option of bitstream or PCM digital out, choose bitstream and let the Onkyo do the decoding. That's your best bet of preserving surround channels if the broadcast has a multichannel surround soundtrack. If the broadcast is stereo, that's all you're going to get whether you ooutput in bitstream or PCM digital format, or in analog either for that matter.

David Aiken

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