IBOCRocks said:
vsa said:
Please tell me, how many HD Radios have been sold since the first one became available in January 2004?
I really want an answer in terms of hard numbers.
I'm sure you do, but it won't prove a point. That's like an anti-Color TV person asking about color TV penetration figures from 1962 to prove that Color-TV is a failure. It's not very indicative of how popular color TV eventually became, after the televisions became low-cost and easy to find. It didn't happen for about 15 years after the technology was introduced. Fortunately we're better at that stuff now, but we're still in the early years. Again - the anti IBOC folks look at the landscape RIGHT NOW to determine the health of HD. Got news for you : You are the only ones doing that! The rest of us are looking a little bit farther into the future, especially since the radios aren't mass produced yet, nor has the promotion really started to gather steam yet.
Color TV isn't a good analog (pun intended) of HD radio. When black-and-white TV came out, color TV was an obvious and much-anticipated revolutionary improvement. Likewise, true radio (voice or "phone," as Hams call it) was an obvious and much-anticipated revolutionary improvement over Marconi's dit-and-dah morse code "wireless telegraphy."
FM radio took so long to finally surpass AM radio because FM was an incremental rather than revolutionary improvement over AM. AM stations used to sound very good back when they really cared about their audio quality (in the 1950s WLW pioneered Hi-Fi AM, which audio engineers judged to sound better than FM). That was why only FM was originally allowed to go stereo, to give it some revolutionary feature over AM to encourage the public to embrace it.
HD FM is only slightly better than analog FM (although some listeners report no discernable difference at all), and thus it is at best only a tiny incremental improvement over analog FM. The HD FM HD2 and HD3 side channels are interesting features, but analog FM already has SCA channels which are much under-utilized. In addition, the HD2 and HD3 channels have no analog signals to blend to when their digital signals are obstructed or have to re-buffer, so unlike analog FM SCA signals the HD2 and HD3 signals will occasionally drop out completely.
HD AM is potentially a revolutionary improvement over analog AM, offering stereo and better audio quality, but it comes at a price. This potential can't be fully realized until and unless analog AM is mandatorily "Sunsetted" (which is unlikely), with all subsequent AM broadcasting being digital-only. In the hybrid analog/digital AM HD system, the need to protect the analog signal component requires using a narrower analog audio bandwidth and low HD transmission power, which makes the analog sound worse and doesn't allow for good HD AM signal coverage. HD AM can't be used at night because its skywave propagation plays havoc with distant analog AM stations, and it increases the noise level on adjacent channels. Since AM has become established as the medium for news/talk radio, stereo is a nice feature but isn't essential. For those AM stations who want stereo, C-QUAM AM Stereo is already available and is 100% compatible with their listeners' existing monaural AM receivers.
There are other digital AM transmission schemes (DRM and CAM-D) which are widely held to be superior to HD AM. The common argument against adopting them (or even evaluating them) is that "HD AM is already in use by many stations, it has receivers available for it, and it is the de facto standard." This argument is the radio equivalent of "Might makes Right," and it is just as fallacious. Microsoft Windows has far greater market penetration than the Linux or MacIntosh operating systems, but no one would seriously argue that Microsoft Windows is superior to them--it achieved its dominant status through the might and muscle of Microsoft rather than by its technical merits. In radio, however, the industry is regulated by the FCC. The FCC should evaluate the competing digital AM (and digital FM) systems and select the best one for each band based on its technical merit.
-- Jason