A number of RF systems use the images to produce direct-RF outputs. The main drawbacks are reduced output due t the sinx/x curve and subsequently greater noise. They don't technically "violate" the sampling theorem, it's just another application of it.
For audio, to apply that sort of ultrasonic energy to the rest of my system seems like a bad thing... But my hearing rolls off well below 60 kHz so maybe I just don't know what I am missing.
For audio, to apply that sort of ultrasonic energy to the rest of my system seems like a bad thing... But my hearing rolls off well below 60 kHz so maybe I just don't know what I am missing.