My only point Savage is that there is no "AM Codec" or "FM Codec". The codec is the same (although there are varying bitrates on AM, and a fallback to a lower-fidelity mono mode when signal conditions are poor on AM).
And frankly I'm tired of the "who cares about sound quality for talk, ballgames, weather reports, etc." I FREAKIN' DO! The human voice is the MOST IMPORTANT SOUND IN OUR LIVES! Our hearing apparatus is tuned to be super-sensitive at voice frequencies. This is why we hear coding problems from low bitrate streams far sooner with spoken word material than more complex music. We freakin' KNOW what the human voice should sound like.
No self-respecting BBC, or NPR listener would dare claim that fidelity doesn't matter when it comes to reproducing voice. In the UK (and often in Canada and other places), MOST talk (or as they call them "speech") shows are in stereo, and sound just stunning...like the people are in the room. Good audio is the difference between listening to an event, and (seemingly) BEING THERE.
Regardless of whether it's talk, music, sports, or whatever, radio is an AUDIO MEDIUM! Audio is the ONLY THING WE HAVE TO OFFER! Should we make our ONLY PRODUCT sound as good as possible, so that it's not the only noisy, low-fi choice available to listeners in ANY medium? I think the answer is obvious. And no, it doesn't necessarily have to be HD within the AM band. It could be that the bandwidth is just to narrow for good analog audio AND (marginal at best, come-on, admit it!) digital. Hey, it's not as if there aren't other ways for AM stations to distribute their audio digitally with higher fidelity (webcasting, leasing an HD2 or HD3 channel from an FM, etc.) Keep the analog audio clean, wideband, and hell...STEREO! Why the hell would we even debate whether our freakin' product should sound good????