Passive signaling during echolocation involves listening to the ambient noises in the room and interpreting them. It has it's pros, such as not being intrusive or noticeable, but it is not the best method for accurate echolocation. These
sounds can be:
- People talking
- A running fan
- Footsteps
- Clothes rubbing against each other
- Hands rubbing together
- Breathing
- or other omni-directional sound sources.
One of the downfalls of these sounds is the fact that their source is undefined, and therefore any sound that is reflected to the listener has the potential to be bouncing
from any direction and can not easily be used to identify the shape of objects.
These sounds can however be used to make broad observations such as the size of a room or proximity to a flat wall. Other estimations may be possible depending on the actual content, level and clarity of the sound and any other distracting sounds that also exist, noticeable or unnoticeable.
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