DaveBayArea said:iyiyi said:Yeah... But...
Every method used to "improve analog FM" results in a trade off for audio quality. Blending to mono, narrowing bandwidth, pre distorting the audio (equalizing), fooling with de-emphasis adjustments, trying to hang digital subcarriers on (and in lieu of) the SCA portion the signal... Every 'improvement' - including analog DSP - compromises the audio in some manner.
I used to think that, and even had some negative things to say about the analog performance of the venerable Sony XDRF1-HD (somewhat revered by FM enthusiasts these days). But we bought one of those BW Broadcast receivers to use at a translator site that is receiving severe HD interference from an adjacent-channel station. All I can say is you should take a listen for yourself. You'll be a believer. Doing an A/B comparison between over-the-air HD and over-the-air analog with the RBRX1 we chose the analog receiver for the translator input. In either case the preamps and/or source material in the studio were the limiting factor in the S/N ratio, and the analog signal didn't have the digital artifacts.
There may be some compromise of the analog audio, but it's not as bad as HD encoding/decoding.
Dave B.
We are talking about completely different things.
You are discussing a legitimate, application specific and customized solution to a very complex, real-world broadcast engineering problem.
There should be no reason for a properly programmed, installed and set up HD to HD link to have objectionable artifacts. Is the HD equipment from the importer to transmitter of factory design or is it an ad hoc assemblage? Something is incorrectly set. I suggest that you seek professional HD guidance because your HD should easily make this link. 1st adjacent HD digital/ HD digital sideband interference is not an issue. The upper/ lower adjacent sidebands have a net 90 degree differential and have reasonable rejection in the QAM detector. A knowledgeable person should comb and correct your HD. Otherwise you are not getting the performance from your system that you have paid such a goodly sum for!
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