Click here to purchase the entire book in PDF format. Distance Perception Go outdoors, close your eyes and stand there and listen for a while. Pay attention to how far away things sound and try not to be distracted by how far away you know that they are. Chances are that you'll start noticing that everything sounds really close. You can tell what direction things are coming from, but you won't really know how far away they are. This is because you probably aren't getting enough information to tell you the distance to the sound source. So, the question becomes, ``what are the cues that you need to determine the distance to the sound source?'' There are a number of cues that we rely on to figure out how far away a sound source is. These are, in no particular order... reflection patterns direct-to-reverberant ratio sound pressure level high-frequency content