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FM Talk Means Music On HD2

H

hubcity

Funny thought. If talk becomes the money maker format on FM (given today's news with Merlin Media's takeovers shuttering music stations in New York and Chicago, and CBS responding by moving news to FM) the HD1 associated with them can be voice-grade...leaving lots of bandwidth for the HD2, with non-stop music and low/non-existent spot load, to create demand for programming you can't hear on FM anymore. And that's just as the power goes up on digital stations and giving them better market reach, and cars start including HD as standard equipment...

Like I said, funny thought.
 
Can the subchannels really be divided up any way the user wants? Considering how backwards some other parts of iBiquity are, I would think they'd dictate the HD-1 have a higher bitrate than the subchannels no matter what.
 
Zach said:
Can the subchannels really be divided up any way the user wants? Considering how backwards some other parts of iBiquity are, I would think they'd dictate the HD-1 have a higher bitrate than the subchannels no matter what.
Click to expand...
I would think the bitrate of HD-1 would have to be high enough so it's at least equal in quality to analog FM. That way when the station is tuned in it doesn't flip to lower quality audio. :)
 
The original rule was that the HD-1 audio was to equal the analog audio; but of those having an HD-2, I can personally hear the downgrade of audio when it goes from analog to HD-1.
 
As mentioned earlier, the rule simply states that the HD-1 must be as good or better than FM. That, of course, is a very grey area, since with some programming the HD is always worse than the FM. The other thing is that the HD radio codec seems to be optimized for music. I notice artifacts are less obvious on some music programming, while news & talk can be quite objectionable. So I'm not sure that the standard rule about lower bitrate for voice applies here, especially if it's still sampling the entire audio spectrum. Of course, I guess you could band-limit both the FM and the HD sampling to 5 KHz and still be compliant. But geez.

Dave B.
 
There is no way that the HD1 stream can come close to the quality of analog FM.
It can't be done with the limited digital bandwidth.
I'd like to see what a L+R 15kHz sine wave looks like when recovered from an HD1 data stream. I'm betting that it wouldn't be pretty.
Okay. Enough of my HD bashing for now.
 
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