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#1
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Is quality FM sound in danger?
I recently came across an interesting article from an NAB (National
Association of Broadcasters) newsletter called "Radio TechCheck". The article is entitled "NPR Evaluating Low Bit Radio Audio Codecs For IBOC". You can retreive the article yourself at: www.nab.org/scitech/techcheck/radio/rd071904.pdf What bothers me is that this article suggest that the FM Hybrid IBOC signal be extended beyond its current bandwith to accommodate additional voice or data services. The diagram in this article shows the extended hybrid portion of the IBOC signal overlapping with the current FM analog signal. I cannot see how this could be done with some degradation to the FM analog signal. I'm all for new technological developments in radio but not if they interfere with existing technology. Does anyone have further information regarding "Extended Hybrid IBOC"? Chris |
#2
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Is it not possible that one would "replace" the other and that the
"overlap" seen on the diagram was for bandwidth illustrative purposes only? As far as FM quality goes, it has decended rapidly over the past few years as more radio stations have eliminated employees and hi-fi reproduction equipment and "employed" computer software and MP3 compression. NPR in our area at least, is one of if not the only decent sounding broadcasting station left. -Bill www.uptownaudio.com Roanoke VA (540) 343-1250 "Chris Kantack" wrote in message ... I recently came across an interesting article from an NAB (National Association of Broadcasters) newsletter called "Radio TechCheck". The article is entitled "NPR Evaluating Low Bit Radio Audio Codecs For IBOC". You can retreive the article yourself at: www.nab.org/scitech/techcheck/radio/rd071904.pdf What bothers me is that this article suggest that the FM Hybrid IBOC signal be extended beyond its current bandwith to accommodate additional voice or data services. The diagram in this article shows the extended hybrid portion of the IBOC signal overlapping with the current FM analog signal. I cannot see how this could be done with some degradation to the FM analog signal. I'm all for new technological developments in radio but not if they interfere with existing technology. Does anyone have further information regarding "Extended Hybrid IBOC"? Chris |
#3
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#4
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Yes, definitely
The most egregious attack on FM sound quality, at least here in the NYC Metro area, is the dearth of stations (only WQXR and part time on WNYC). WQXR is desperate for any advertisement -- if you want to hear ads for funeral homes you'll get a good idea of what they think of their market dynamics. WQXR is also running with less "juice" than before -- (this was confirmed to me by one of their engineers, it may have been temporary) -- I noticed that the S-Level (if you can call it that, there is a signal strength meter on my Linn) -- was down several dB. I am using a 6 element yagi tuned between WNYC and WQXR for FM reception. Similarly, while in Cleveland recently I noticed that WCLV or whatever they call themselves these days, ran the same kind of commercials you hear on talk radio. Of course, a.m. talk radio sound quality is also lower -- and they try to take advantage of propagation by overly reducing the power -- I have an HP 3586C measurement receiver and you can see the dBm's drop right after 6:00 pm. my advice -- become a webonaut -- I listen to one of the Ohio stations on the web while I do my work at the computer. "Chris Kantack" wrote in message ... I recently came across an interesting article from an NAB (National Association of Broadcasters) newsletter called "Radio TechCheck". The article is entitled "NPR Evaluating Low Bit Radio Audio Codecs For IBOC". You can retreive the article yourself at: www.nab.org/scitech/techcheck/radio/rd071904.pdf What bothers me is that this article suggest that the FM Hybrid IBOC signal be extended beyond its current bandwith to accommodate additional voice or data services. The diagram in this article shows the extended hybrid portion of the IBOC signal overlapping with the current FM analog signal. I cannot see how this could be done with some degradation to the FM analog signal. I'm all for new technological developments in radio but not if they interfere with existing technology. Does anyone have further information regarding "Extended Hybrid IBOC"? Chris |
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