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HD4

M

mgpt6

I was just wondering about HD4. Will it be just enough bits for mono like HD3? Will a current HD Radio decode it? Will a FM station have to drop its 92 or 67 kHz SCA subcarrier to carry HD4?
 
ddsparxx said:
Does anybody know if the current-production HD raidos/tuners can receive HD-4?
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They should be, or else a lot of HD radios will be obsolete.

That's a problem with HD, every time the codec is changed, every radio becomes obsolete.
 
Here in Maryland, Ibiquity has an experimental license for occasional transmissions on 93.5 FM. Over a year ago they were on the air with some tests where I received Analogue, HD1, HD2, HD4 and HD6 on a standard Radio Shack Accurian HD table radio. The sound quality was similar to decent satellite radio on all of these channels. I am not sure why they came in on 1, 2, 4, and 6 instead of 1,2,3,and 4, but was told by my sources that it was the expected behaviour based on what they were transmitting.

...Sam
 
Maybe WAWZ could be the first FM station to put out and HD4 sometime in the near future, if so, then probably be religious.
 
Today's Fybush said that CBS WJFK -FM in DC. would have a HD4. The HD 2,3 ,4 would be imports of other CBS sports stations.Sounds like 48kbs for the HD1 and 24kbs for the HD 2,3 and 4.
 
mgpt6 said:
Today's Fybush said that CBS WJFK -FM in DC. would have a HD4. The HD 2,3 ,4 would be imports of other CBS sports stations.Sounds like 48kbs for the HD1 and 24kbs for the HD 2,3 and 4.
Click to expand...
That would mandate WJFK moving to extended hybrid mode to allow the 120kbit total output (48+24+24+24=120). :-\

Staying with standard hybrid or 96kbit would mean 2, 3 & 4 would only have 16kbit each unless they all go down to 24kbit. ::)

However they do it they need the HD-1 to be comparable to the analog signal. It wouldn't do for those with HD radios to hear analog fade to dial-up quality digital. :D

Especially if their radio doesn't have an "analog-only" button. ;)
 
WJFk did started doing simulcasts of WFAN, WIP, and WJZ-FM(?) yesterday on up to HD4. Right now the subchannels are dead air at this time (2:30).
 
Nick said:
I heard an HD4 on WAWZ 99.1, but the HD4 was playing dead air.
Click to expand...

That is the sound of the world after the Apocalypse.
 
ddsparxx said:
WJFk did started doing simulcasts of WFAN, WIP, and WJZ-FM(?) yesterday on up to HD4. Right now the subchannels are dead air at this time (2:30).
Click to expand...

How does their digital signal perform with the close spacing of analog signals?
 
Unfortunately I didn't have the opportunity to determine any difference in the quality of sound of 24 kbs compared to analog or the 48 kbs yet.
 
Oh, there will be NO difference. 24 kbps stereo will sound JUST FINE. ::)

(It's just like national health care. We can add universal coverage for 30 million Americans - or 17 million more Americans - or 50 million Americans who are currently uninsured, depending on which lie is being peddled at the moment - and "SAVE MONEY.")
 
ddsparxx, I am referring to how well the digital signal performs in terms of range, lack of dropouts etc, and not the fidelity. WJFK is probably the most interfered with station on the FM band. If IBOC works well with WJFK with -14db digital power, it will probably work well with any FM station.

Savage, I like your comments with respect to health care and agree with you on that point. Perhaps you will eventually come around to the concept of FM IBOC too 8).
 
Len14043 said:
ddsparxx, I am referring to how well the digital signal performs in terms of range, lack of dropouts etc, and not the fidelity. WJFK is probably the most interfered with station on the FM band. If IBOC works well with WJFK with -14db digital power, it will probably work well with any FM station.

Savage, I like your comments with respect to health care and agree with you on that point. Perhaps you will eventually come around to the concept of FM IBOC too 8).
Click to expand...

Sorry, Len. I was thinking about the quality of sound. In terms of range, amount of dropouts...probably similar compared to HD1/HD2 combination. I'm not 100% sure.
 
Absolutely, Len. I promise as soon as they figure out real-world practical and workable solutions for - well, let's say six - of HD's Radio's approximate twenty documented serious technical faults - and stop lying about the problems - I will become an advocate supporting the system.

Let's start with interference. Self- and adjacent-channel.
 
It appears to be that WJFK's adjacent interference has gotten worse after the HD4 went on air. It's gotten harder to hear Baltimore's WWMX 106.5 and Hagerstown, MD's WWEG 106.9 than before. I haven't noticed any change in any 106.3 or 107.1 on the dial position, if any.

There appears to be no change in the difference in any dropouts or digital signals' ranges, since the HD tuners are at home and not in a car. Just my observations.
 
Interesting take on "quadcasting" from Ken Dardis.

While not addressing the technical problems of HD-4 he focuses on the wisdom of importing out-of-town stations on side channels as a programming strategy as well as questioning how stations are utilizing side channels now verses their intended purpose.

He says:
"Count 'em, that's four sports-talk radio stations, delivered on the HD channels that were designed to bring thousands of new radio programs to the masses. That's not exactly how HD Radio was supposed to work when announced way back when."

http://www.rbr.com/features/viewpoints/22150.html

c5
 
I think that assessment misses the point. Talk is not generic. Four talk stations may duplicate a topic, but they do not duplicate content.

(Which is a point the seven hit-formatted radio stations in my area seem to be missing.)
 
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