fft - Created Matlab echo signal: Is it an actual "echo?" Or am I just manipulating the signal to make it seem like an echo? - Signal Processing Stack Exchange
Estimating ultrasonic time-of-flight through echo signal envelope and modified Gauss Newton method - ScienceDirect
fft - Created Matlab echo signal: Is it an actual "echo?" Or am I just manipulating the signal to make it seem like an echo? - Signal Processing Stack Exchange