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Classix 107-9

J

JH_Radio

So this is very very strange.
If I put on the analog signal its in mono. if I switch to HD its in stereo.
Is that purposely done?
 
I know that but is this analog signal in mono while the digital is in stereo? or do they have different feeds for each.
Like hmmm. what I don't understand is, how is it possible for the analog signal to be in mono but the digital to be in stereo?
I know HD piggybacks on the side channels of the analog carrier...
 
JH_Radio said:
I know that but is this analog signal in mono while the digital is in stereo? or do they have different feeds for each.
Like hmmm. what I don't understand is, how is it possible for the analog signal to be in mono but the digital to be in stereo?
I know HD piggybacks on the side channels of the analog carrier...
Click to expand...
The analog signal is separate from the digital one, and each can be mono or stereo or even have separate content. The HD-1 per the FCC must duplicate the programming of the analog signal, but that is a rule, not an engineering "truth".

The digital signal can all be used by the HD-1 or split into multiple pieces.
 
DavidEduardo said:
The digital signal can all be used by the HD-1 or split into multiple pieces.
Click to expand...

If a station only has a HD1 channel (without any extra channels), wouldn't that mean that the HD1 would sound the best it can sound?
Isn't there a rule from the FCC about how much of the codec the HD one must use?
If a radio station has 4 HD signals, how is the codec split up?
What codec is used for HD? I believe its MP3?
Which then that means that the analog signal will sound better as its a not compressed signal, right?
But then that also depends. If a station isn't using lossless audio for their music library then that won't matter. Is that also correct?
Thanks!
 
Last edited by a moderator:
JH_Radio said:
Isn't there a rule from the FCC about how much of the codec the HD one must use?
Click to expand...
There is no rule that you must broadcast with the highest bitrate.
JH_Radio said:
If a radio station has 4 HD signals, how is the codec split up?
Click to expand...
The station gets some flexibility in how they assign the bit rates to each subchannel.
JH_Radio said:
What codec is used for HD? I believe its MP3?
Click to expand...
No, it is the HD Codec, something that IBiquity dreamed up so they could patent it.
JH_Radio said:
Which then that means that the analog signal will sound better as its a not compressed signal, right?
But then that also depends. If a station isn't using lossless audio for their music library then that won't matter. Is that also correct?
Click to expand...
There are lots of things in an airchain that can degrade the audio quality of HD radio - lossy compression of a music library is one of them.
 
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