Talk:In-band on-channel

Challenges correction?
I believe this is incorrect: "this is officially said to stand for "hybrid digital" rather than "high definition"." iBiquity's marketers and staff at recent NAB shows say the HD does not stand for anything. Crutchfield: http://www.crutchfieldadvisor.com/ISEO-rgbtcspd/learningcenter/car/hdradio_faq.html#4

At the 2006 Texas Association of Broadcasters meeting, representatives of the HD Radio Alliance repeated that the HD in HD Radio does not stand for anything.


 * If you look at HD Radio's *original* whitepapers, available at ibiquity.com, they called it Hybrid Digital.   They later changed their tune and claimed HD does not mean anything, but the evidence is there for all to see.  - Theaveng (talk) 13:37, 29 October 2008 (UTC)

There are two "HD" terms being discussed here. "HD" during the lab and test phase was short for Hybrid Digital. "HD" as used in "HD Radio" is a brand mark registered by iBiquity sometime around 2000 (IIRC), and their lawyer, speaking to a room full of broadcast engineers at the NRSC, said that "HD did not stand for anything." In a brand mark, they get to decide what the letters mean. — Preceding unsigned comment added by 68.36.169.26 (talk) 12:03, 22 January 2013 (UTC)

FM multiplex
I believe this to be inaccurate: "This is especially so if the FM station chooses to continue using part of its bandwidth for analog stereo, decreasing the amount available to (and therefore the audio quality of) the digital signal."

In the FM multiplex system, the L-R stereo information is a subcarrier at 38 kHz in the composite signal. Stations not using this subcarrier are still permitted to modulate at 100% deviation (+- 75 kHz). While it would be possible to reduce the carrier deviation, doing so would result in a lower signal-to-noise ratio in the receiver.

The extended hybrid modes (MP2, MP3, MP4) in IBOC allows for an additional data channel, but they should not significantly affect stereo and SCA operation.

-- This comment added by 69.1.3.234 on 21 Jan 2005

FCC?
"However, by putting extra RF energy just outside the edge of the station's FCC defined channel,"

Is that the Federal Comms Commn? If so, its Americocentric, its okay as a example in this technical point, but it should at least have an FCC wikipedia [] link. --81.105.251.160 00:58, 6 August 2006 (UTC)

NPOV
There is a bias favoring HD radio in the CAM-D section. The article itself here suffers from the same bias but I have attempted to fix the POV on that article. This one needs to be neutral too. The CAM-D section seems to be more of criticism than of how it actually works, where as HD radio has seemingly been glorified, which is anything but the truth. Milonica (talk) 22:21, 2 March 2008 (UTC)

Ibiquity has PR people editing Wikipedia, of course! 76.191.139.200 (talk) 23:30, 17 April 2008 (UTC)

Lots of confused wording and factual errors
Lots of confused wording and factual errors in this article. DRM is not an "IBOC" system, nor is DAB Eureka 147. --KJRehberg (talk) 01:38, 30 September 2008 (UTC)

Need more references to licensing terms for "HD Radio" and "AMR-WBplus"
What are the real initial and ongoing costs for station owners in 2013 and beyond?

The statements on the page AMR-WBplus seem to be at odds with the assertions made here. Which ones are correct? Ongoing royalties, etc? rhyre (talk) 21:59, 7 September 2013 (UTC)

Advantages of digital radio
The main advantage of digital radio is that it doesn't have the usual distortion associated with analogue radio such as hissing, popping and phasing. It is immune to distortion from multipath, adjacent stations. User get a new array of data-rich services including traffic information, sports score and weather updates, stock prices, etc.. The data is displayed on the LCD in the form of text, images and video. Thus multimedia radio — Preceding unsigned comment added by 182.18.177.106 (talk) 04:08, 6 March 2015 (UTC)

External links modified
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Update needed?
For me as a German citizen this whole article reads like being out of 2010. Here in Europe DAB using MP2 has been discontinued in 2011 and DAB+ using MP4 AAC started. Medium wave has been discontinued in 2015 in Germany. Norway has discontinued FM in 2017 and completely switched over to DAB+. Switzerland is planning to do so in 2022. Several stations have already discontinued their analogue transmissions and only use DAB+. I don't remember when IBOC on FM has been in discussion last time. --Gorgeous188 (talk) 11:06, 11 November 2020 (UTC)