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#11
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CBS/Infinity and IBOC-AM?
In article ,
Doug Smith W9WI wrote: Eureka offers every station in a city identical coverage. I'm pretty sure IBOC was invented mostly to prevent the adoption of Eureka in the U.S., and the resulting ability of low-power, AM, and daytime-only stations to develop a full-fidelity, full-time signal able to compete with the high-powered FMs. The local NPR station (KUOW) had an hour with their engineering staff on one of their talk shows last summer when they started using IBOC. One of them said, directly, that the National Association of Broadcasters opposed other digitial radio systems because they doubled the number of available channels. Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
#12
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CBS/Infinity and IBOC-AM?
May I chime in from the broadcasters perspective? Most of what's been
written is very accurate. The IBOC technology as implemented in the USA was developed by Ibiquity, Inc and is licensed under the name 'HD Radio'. Hence, if you're interested in purchasing a receiver to decode this technology, do a search for 'HD Radio'. To date, there are very few receivers available, largely due to standards resolution, and the long lead-time required by Detroit to implement new technologies into US made automobiles. My sense is that radio Broadcasters, feeling the heat of competition from XM / Sirius / Ipods / Internet streams + WiFi, as well as the Eureka 147 digital radio roll-out in Europe (whereby all radio services emanate from a single point-source, and all have the same technical capabilities) felt the need to "do something digital". It had to be on the traditional AM/FM band because Broadcasters have paid a ton of money for each of their properties; to simply abandon the AM/FM scheme in order to implement 'digital' would have been financially devastating to station owners. As has been discussed, HD Radio is not currently authorized on AM stations at night, ("night is *not* defined as 6 AM to 6 PM, but rather varies with a station's geographic location and the time of year) though a serious lobbying effort is on to change this. Hence, at this point it does not seriously impact DX opportunities, since most long-range reception is a nighttime phenomenon (when the IBOC signals are off). Here in Los Angeles, we've implemented HD Radio on AM 1110, Radio Disney - a children's formatted music station. I would describe the aural result as "startling" - 14 kHz stereo, very low noise, no obviously noticable artifacts, no multi-path in an automotive environment - in short, it's *very* hard to believe you're hearing an AM station. Compare this to a *typical* AM receiver (not necessarily a Drake R8B or Eton E1/XM) with a mono 3.5 kHz response and loud buzzes evey time you drive under a power line, and you can see the attractivness to the Broadcasting community. "Here, finally is a way to compete with new technologies" [programming issues aside!]. On the FM side, the aural improvement is much less noticeable. Since no pre-emphasis is required in the IBOC signal path, the high-end sounds more 'natural' and 'airy', but these are very subjective terms. What is new is the ability to "split" the IBOC bandwidth, such that station W*** - FM can now have 2 or 3 full fidelity "sister" or "associated" stations. This will provide FM broadcasters with the opportunity to explore new (and hopefully more creative) programming opportunities. Here in LA, about a half-dozen FM broadcasters have already implemented this "multiple channel" broadcasting, and most of these new channels are (for the time being) commercial free. Too, there is a lot of talk about implementing 'surround' sound on IBOC FM, which also might prove to be a 'startling' addition to our radio experiences. Again, my sense is that broadcasters are thinking that the analog technology that served us well in the 20th Century has run its course, and that to remain a viable medium a transition to digital *must* take place. The trouble is that there are (probably) a half-billion analog receivers in the USA alone capable of receiving analog AM / FM, and these can't be abandoned overnight. The Station's around the country are now in the first phase of implementing digital radio, in the form of IBOC / HD Radio. And my bet is that it's *not* going to go away. Mike Worrall ABC Radio Los Angeles |
#13
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CBS/Infinity and IBOC-AM?
Digital tv switchover in 2009,digital radio is coming along now.Why
can't them a...oles leave analog alone and leave well enough alone? cuhulin |
#14
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CBS/Infinity and IBOC-AM?
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#15
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CBS/Infinity and IBOC-AM?
On Thu, 29 Dec 2005 22:08:47 -0500, dxAce
wrote: Again, my sense is that broadcasters are thinking that the analog technology that served us well in the 20th Century has run its course, and that to remain a viable medium a transition to digital *must* take place. The trouble is that there are (probably) a half-billion analog receivers in the USA alone capable of receiving analog AM / FM, and these can't be abandoned overnight. The Station's around the country are now in the first phase of implementing digital radio, in the form of IBOC / HD Radio. And my bet is that it's *not* going to go away. That's unfortunate in that it needs to die just like DRM needs to die. dxAce Michigan USA The USA could have gone Eureka 147 but the NAB and Collins/Rockwell blocked it. Now they have to deal with the consequences, XM and Sirius. |
#16
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CBS/Infinity and IBOC-AM?
David wrote:
On Thu, 29 Dec 2005 21:07:45 -0600, wrote: Digital tv switchover in 2009,digital radio is coming along now.Why can't them a...oles leave analog alone and leave well enough alone? cuhulin It's a fiendish plot to make you go crazy. They've apparently been enjoying their success for quite some time now. mike |
#17
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CBS/Infinity and IBOC-AM?
Just because I am weird doesn't mean I am crazy.I just finished watching
The Great Escape movie on tv,A Bridge Too Far movie has just now started on tv.I am trying to figure if I am weird enough to stay awoke and watch that movie tonight.Nahhh,soon as I finish this cigarette,I am cutting the light and hitting the sack. www.devilfinder.com The Real Great Escape cuhulin |
#18
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CBS/Infinity and IBOC-AM?
DaviD - " It's a fiendish plot to make you go crazy. "
Some would say that 'you' are evidence if it's success ~ RHF |
#19
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CBS/Infinity and IBOC-AM?
"David Eduardo" wrote in message . com... The current adaptation allows one analog and two digital signals, one of which has the same content of the analog signal. AM IBOC only allows one digital signal, in parallel withthe analog signal. Yes, but we at rec.radio.shortwave celebrate conspiracy theories and Hidden Knowledge. So, would it be impossible to develop a new generation of IBOC-AM which would have independent programming on the digital sidebands? Of course, the "new and improved" IBOC would require consumers to pay for yet another Ibiquity patented radio. Also, when the presumed analog phase-out is completed, will the channels be restored to the old standard, or will the broadcasters have to find something to do with all that redundant bandwidth? Frank Dresser |
#20
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CBS/Infinity and IBOC-AM?
wrote in message oups.com... May I chime in from the broadcasters perspective? Most of what's been written is very accurate. The IBOC technology as implemented in the USA was developed by Ibiquity, Inc and is licensed under the name 'HD Radio'. Hence, if you're interested in purchasing a receiver to decode this technology, do a search for 'HD Radio'. To date, there are very few receivers available, largely due to standards resolution, and the long lead-time required by Detroit to implement new technologies into US made automobiles. My sense is that radio Broadcasters, feeling the heat of competition from XM / Sirius / Ipods / Internet streams + WiFi, as well as the Eureka 147 digital radio roll-out in Europe (whereby all radio services emanate from a single point-source, and all have the same technical capabilities) felt the need to "do something digital". It had to be on the traditional AM/FM band because Broadcasters have paid a ton of money for each of their properties; to simply abandon the AM/FM scheme in order to implement 'digital' would have been financially devastating to station owners. As has been discussed, HD Radio is not currently authorized on AM stations at night, ("night is *not* defined as 6 AM to 6 PM, but rather varies with a station's geographic location and the time of year) though a serious lobbying effort is on to change this. Hence, at this point it does not seriously impact DX opportunities, since most long-range reception is a nighttime phenomenon (when the IBOC signals are off). Here in Los Angeles, we've implemented HD Radio on AM 1110, Radio Disney - a children's formatted music station. I would describe the aural result as "startling" - 14 kHz stereo, very low noise, no obviously noticable artifacts, no multi-path in an automotive environment - in short, it's *very* hard to believe you're hearing an AM station. Compare this to a *typical* AM receiver (not necessarily a Drake R8B or Eton E1/XM) with a mono 3.5 kHz response and loud buzzes evey time you drive under a power line, and you can see the attractivness to the Broadcasting community. "Here, finally is a way to compete with new technologies" [programming issues aside!]. On the FM side, the aural improvement is much less noticeable. Since no pre-emphasis is required in the IBOC signal path, the high-end sounds more 'natural' and 'airy', but these are very subjective terms. What is new is the ability to "split" the IBOC bandwidth, such that station W*** - FM can now have 2 or 3 full fidelity "sister" or "associated" stations. This will provide FM broadcasters with the opportunity to explore new (and hopefully more creative) programming opportunities. Here in LA, about a half-dozen FM broadcasters have already implemented this "multiple channel" broadcasting, and most of these new channels are (for the time being) commercial free. Too, there is a lot of talk about implementing 'surround' sound on IBOC FM, which also might prove to be a 'startling' addition to our radio experiences. Again, my sense is that broadcasters are thinking that the analog technology that served us well in the 20th Century has run its course, and that to remain a viable medium a transition to digital *must* take place. The trouble is that there are (probably) a half-billion analog receivers in the USA alone capable of receiving analog AM / FM, and these can't be abandoned overnight. The Station's around the country are now in the first phase of implementing digital radio, in the form of IBOC / HD Radio. And my bet is that it's *not* going to go away. Mike Worrall ABC Radio Los Angeles |
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