I wonder if this would apply to mixing in a frequency that would result in an audible heterodyne mix (think like active noice cancelling but using a waveform th

I wonder if this would apply to mixing in a frequency that would result in an audible heterodyne mix (think like active noice cancelling but using a waveform that is designed to downconvert vs cancel). I do believe there is a method to use this to give blind folks an ambient doppler tone from objects in their vicininity. I just don't have the chops or time to try it out.