BRNout said:
It does restrict the analog audio of the station doing the polluting. The audio sounds thinner and less robust than without the bandwidth restriction that "IBOC" imposes on that analog portion of the transmission.
The standards committee headed by Bob Orban showed that any audio bandwidth above around 5 to 6 kHz does not enhance listening on the immense bulk of consumer AM radios, so your point here is lacking in real world relevance.
David, that is an exaggeration. I am in my mid 40s and very well remember when most people listened to AM top 40 stations. And when most radios that a kid would have did not offer FM (because they were cheap). As a result, most of my early listening (and there was a lot of it) was to AM. We had an FM radio in the car, but that's because my dad liked gadgets. Most of my friends' cars still offered AM only. This trend did change by the late 1970s, but at that time anyone who is 60 now would have been in their late 20s.
Probably facts are better than anecdotes...
Houston, market 6.
AM share of listening
Persons 55 and over: 23% average share of all radio listening, 6 AM to Midnight Mon-Sun
Persons 65 and over: 29%
Persons 55-64: 19.2%
Persons 45-54: 8.3%
Persons 35-44: 5.8%
Persons 25-34: 3.5%
Persons 18-24: 1.1%
So, what we see is the product of the FM generations, now two of them, having grown up with the best music found on FM... and that started in the very early 70's, or about 40 years ago. Anyone under 50 to 55 had little enduring AM experience as we saw time after time how pop music stations that appeared on FM took the AM audience, often by storm.
Since no teens had cars before age 16 at least, that meant that whether there was an FM car radio or not certainly did not influence anyone under 52 or 53. Since most teens did not have cars till much later, the car issue is almost a moot point for anyone under 55. And since, at that time, less than 30% of radio listening was in the car, overemphasizing car radio issues does not get to the real point, which is that AM was abandoned over 30 years ago by music listeners due to the quality of FM and other factors such as format variety. It has nothing to do with HD/IBOC, NRSC, today's crop of managers, etc. And it really has little to do with man made noise, other than the fact that there are, today, more reasons why more AMs are not viable in any format.
Yes, FM was surging during the 70s - but a lot of people still listened to AM because AM radios were cheap, portable and ubiquitous. That was over by 1980 when the cost of FM dropped to the point where every little radio offered it too.
FM reached the tipping point in 1977 when it exceeded half of all listening. But in the younger demos, the scale had tipped in most markets well before that... in some cases, half the 18-34 and teen listening was on FM as early as '72 or '73. It does not matter what radios cost... what matters is that people who are now in their early to mid 50's either abandoned AM early on or never had a lasting passion for an AM station.
If you look at persons 18-34 in our large sample market, of those who did use AM, nearly three times as many listened for less than an hour a day as those who listened over an hour. In other words, the use of AM by under-34's is for the most part "accidental" in the PPM world.
You are a little off in your math. Not totally wrong (unfortunately) but the math is.
The usage figures do not make a case for your anecdotal experience.