Anyone who's driven cross-country knows that FM is nice and clear for a while, then kind of fades out as you reach the edge of the transmitter's range. There's

Anyone who's driven cross-country knows that FM is nice and clear for a while, then kind of fades out as you reach the edge of the transmitter's range. There's at least a sense of continuity with the drop in signal strength. Digital has a sharp transition between crystal-clear and completely dead. That's the distinction being made above.