Is AM HD in Mono or Stereo??
I saw a comment on youtube about being in Mono
I saw a comment on youtube about being in Mono
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AM HD Stereo or Mono
- Thread starter MarioMania
- Start date
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rbrucecarter5
Guest
MarioMania said:
No - the music stations I have heard in AM HD are definitely stereo. That said - it takes much more signal strength to pull out HD AM stereo than it does HD AM mono.
K6JHU said:And how many music stations are there left on AM
If they keep converting to HD and alienating the 99.9% who listen in analog, there won't be any left at all soon!
There may not be many traditional music stations left on AM, but it's just about the only place to find oldies anymore. And AM here has found new life with gospel music and Spanish music formats. They may be kind of niche, but they don't deserve to have worse audio than necessary!
MarioMania said:
Yes.
It is very difficult to broadcast bits of data on AM, so the IBOC system separates the data into two streams, "core" and "enhanced". The "core" stream contains the minimum essential data to receive the broadcast digitally, and it's broadcast in a way that makes it more robust than the "enhanced" stream.
I don't know for certain that the stereo (L-R) data is broadcast in the "enhanced" stream, but if I were designing it, that's what I would do. In other words, under conditions of best reception you'd get stereo. With a weaker signal, not.
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rbrucecarter5
Guest
K6JHU said:And how many music stations are there left on AM
I've been really enjoying Radio Disney. But I get them on Satellite because the local outlet in Houston is too far away for reliable HD stereo. But when I lived in the Dallas area, the stereo was easy to get. Mono locks, then a few seconds later, stereo. I will say that the satellite feed is far less compressed than the AM HD - big surprise!
What's the diffenece between in AM HD Stereo and AM Stereo??
I only heard AM Stereo on youtube
I only heard AM Stereo on youtube
Any kind of AM stereo in HD is going to sound like crap. AM doesn't have the bandwidth to transmit high bit rate digital. Hell, analog AM stereo will put HD AM to shame all day and night, when it's processed correctly and the available analog bandwidth is used. I've heard AM analog stereo ( Kahn and C-Quam) put some FM's to shame on the right receiver. Ain't coming back though. Believe that.
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rbrucecarter5
Guest
MarioMania said:
AM HD stereo is a highly compressed digital format, which is extremely susceptible to interference, has extremely limited range, and jams up to two adjacents on each side of the main channel.
AM stereo was an analog format from the 80's which sounded great, had great separation, and was a robust signal that could be decoded even under weak signal conditions. It also did not interfere with adjacent frequencies.
Sadly, HD AM stereo has all but killed AM stereo.
Analog AM stereo sounded very good with the right processing, but IMHO, it was ten years too late in implementation. By the time it did get introduced to the listening public, music stations had largely made the move to FM stereo, the FCC had made some poor decisions, delaying it even further, and the AM sections of most consumer car and home stereos were being manufactured with, what seemed to be, cheaper chips, making AM sound even worse, in comparison to FM! Although a few mid to late 1980's vehicles DID have AM Stereo tuners, and some even included a wideband selector switch, which made the stations sound better. Too bad it didn't catch on.
As I've said before: outlaw HD-AM for generating unacceptable interference. Scrap NRSC and open the band up to 15 kHz-D, 12.5 kHz-N (to be reduced to 12.5/10 in adjacent problem areas.) Mandate sales of all receivers to be FM/C-QUAM AM-capable. (Yes, I know there will be some interference, but it will be nothing compared with the mess generated by IBOC.)
Mandate all AMs to convert to C-QUAM AM stereo within 5 years. Stop the handwringing and naysaying about Part 15 interference and start enforcing the rules.
Within a year or two you'd start to see innovative, non-"mainstream" music formats cropping up on AM. If the programming is appealing and it's promoted effectively, the audience will start to come back. It will be slow at first - but this scenario beats the current trajectory.
Mandate all AMs to convert to C-QUAM AM stereo within 5 years. Stop the handwringing and naysaying about Part 15 interference and start enforcing the rules.
Within a year or two you'd start to see innovative, non-"mainstream" music formats cropping up on AM. If the programming is appealing and it's promoted effectively, the audience will start to come back. It will be slow at first - but this scenario beats the current trajectory.
The only problem with mandating is the cost of getting the antenna system broad enough, then purchasing the equipment and having someone available to install and maintain could break the bank on a lot of AM's. Besides, if you're 24/7 talk, stereo isn't going to give you any bang.
If I can receive a good quality AM stereo signal from Iowa to Kentucky on 1630AM, and also from WLS Chicago, then I'm sure more can be received if stations would give up the ghost on HD radio. WSM sounded great when it was in stereo. We should do all we can to promote this. I wonder how many stations still have AM stereo equipment that was turned off in favor of the HD system?
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