I have practiced echolocation for fun. Getting some basic awareness from your surroundings is not that difficult, like detecting if there is a wall on your left

I have practiced echolocation for fun. Getting some basic awareness from your surroundings is not that difficult, like detecting if there is a wall on your left or right side. The difference in the sound response is subtle but clear. It's like tweaking the knobs of a reverb effect in an audio processing software. It is not about detecting discrete echo pulses like a radar or a sonar does, it's about sensing a change in the "tone" of the sound you make. In signal processing terms you're "measuring" the impulse response of the room around you.