Echolocation refers to receiving information about surroundings by bouncing sound waves off surfaces. As for example, bats use echolocation to navigate and find food in the dark. There are two types of echolocation: passive echolocation and active echolocation. Passive echolocation can be used when sounds emitted by a source other than yourself. This type of echolocation occurs for humans every day. The other type of echolocation is active echolocation. This type involves emitting one's own sounds for echolocation, which can help perceive impressive detail. With that being said, passive echolocation occurs much more frequently for humans with all of the many sounds around us.
https://www.youtube.com/watch?v=WHYCs8xtzUI
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I enjoyed the section of this chapter that described Jay Patterson's job as a sound mixer in movies and TV. His goal of immersing audiences in to a movie scene by way of sound is an important one. Anyone who was ever been involved in an amateur film knows how difficult it is to capture exactly how a room sounds. If your goal is to truly engage an audience in a scene, then it is not enough to simply film with a camera. Sounds are heard differently depending on the room you are in. Dropping a glass of water in a bathroom compared to a living room can sound completely different because of the way sound bounces off surfaces and what could absorb it within the room. Jay Patterson will walk on to a set and with just a single firm clap of his hands he is able to detect the acoustic reflective properties of the set and he then modifies it accordingly.
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