Humans that use echolocation would emit sounds like mouth clicks, cane taps, finger snaps, footsteps and so on. This reflected sound would help the individual identify their surroundings and give them a 3-D mental image of the objects around them, they would then know how to move accordingly. The term for this would be Flash Sonar, the reflected sound/echoes would help an individual perceive three characteristics of an object. The three characteristics is: the height and width of the object, the depth of the object and location.
There is two types of sonar processing which is active and passive, passive sonar processing is like hearing vague sounds of an object from the environment or yourself but you're not able to identify it so you will be able to sense the presence of an object but not know much details of the object. Most humans use passive sonar processing but active sonar processing is when the individual produce sound to perceive the specific details of an item, especially at farther distances. The brain would then have to differentiate the characteristics of the sound/echo that bounced of the object.