CAS PS 222 Lecture Notes - Lecture 13: Auditory Scene Analysis
18 May 2018
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Auditory Scene Analysis:
What processes go into segmenting an auditory scene (signals around us in the world) into
behaviorally relevant units that we can interact with?
- So if we think about all the sounds in a scenario – talking, music, fireworks, actions, horns
etc. all of these sounds that make up the auditory scene. The challenge is that all of these
sounds come into our ear as single complex sound waves. Each individual wave is a
complex wave form which all come together to form a single complex waveform that goes
into our ear.
- How do we segment the noises?
- In space: how do figure out what is the source of the sound? And how do we figure out
which sounds make up the waveform over time?
- This process is called auditory scene analysis: we are analyzing the different sources of
sounds from the environment.
- So the persons’ job is to take the sound input and extract different sources of sound in
space and time.
How do we do this?
- Analyzing the sound: Source in space:
-Localization
-Simultaneous grouping
- Analyzing the sound source in time:
-sequential grouping (more stuff under this)
Source in Space:
- Localization: allow us to take incoming auditory info and figure out where in space it is
coming from.
- That is: Interal Time Difference(ITD):
- and Introral level difference: if a sound coming from one side, the amplitude reaching
one side is going to be louder on that side, than on the other side which is further away
from the source.
- These are important to knowing where the sound is coming from like where each
individual instrumental sound is coming from.
What if there are different sounds are coming from the same source or from very far away?
- Then we cant use localization to know.
So we use Simultaneous grouping.
- If the frequency in the auditory stream start and stop at the same time
- If the component sound tend to change in the same way at the same time
Document Summary
So if we think about all the sounds in a scenario talking, music, fireworks, actions, horns etc. all of these sounds that make up the auditory scene. The challenge is that all of these sounds come into our ear as single complex sound waves. Each individual wave is a complex wave form which all come together to form a single complex waveform that goes into our ear. This process is called auditory scene analysis: we are analyzing the different sources of sounds from the environment. So the persons" job is to take the sound input and extract different sources of sound in space and time. Localization: allow us to take incoming auditory info and figure out where in space it is coming from. These are important to knowing where the sound is coming from like where each individual instrumental sound is coming from. Then we cant use localization to know.
