JohnnyElectron said:With DSP chips on AM, they could decode all AM stereo formats, provide noise-blanking, eliminate platform motion, and have variable bandwidth based on signal quality! I'm all for it. We just need a "Mr. Kirby" sitting at his Texas Instruments lab on a holiday working on encoding the chip!
With all the dialog on this subject, it's interesting that nobody has mentioned that stand-alone radios are not a particularly hot selling item. Radios are part of something else now... a smartphone dock, some MP3 player, cars, etc.
It would take decades to replace the existing radios in the US. For example, the average age of a car is nearly 9 years, meaning it would take nearly a decade to replace just half the car radios out there.
But beyond that is the fact that in 10 or 20 years it's unlikely that terrestrial broadcasting will depend on AM or FM signals much. And with the average Top 100 market having less than 2 viable full coverage signals, the incentive to look for a radio with "better" AM reception is not there... the window of opportunity for AM stereo closed in 1980 or thereabouts.