Huron & SNAP Documentation

Scene
(List of Tracks)
Track
(List of Trajectories)
Trajectory
(List of Events)
Event
Figure 43 – Sonic Animator Hierarchical Model
THE SIMULATION TOOLS
The highest level element is the scene. A scene corresponds
logically to a single soundscape that has a start time and a
duration. It contains a number of tracks that will be played
back simultaneously.
A track is a conceptual device that describes all movement of a
single sound source. Each sound source will be replayed on a
Location Channel Number so each track has its own unique
channel mapping.
A trajectory is a conceptual device that represents a single
movement sequence within a track. A trajectory has a defined
start time and duration. A track may consist of multiple
trajectories if the trajectories are logically separate movements.
For example, the sound of a car may approach from a distance
and then stop in front of the listener. Some time later, it may
turn around and drive off again. The two movements can be
recorded separately and dealt with as separate trajectories.
An event is a location message that occurs at a defined time
within a trajectory. Events are stored relative to the start time
of the trajectory. This means that the first event is always at
time = 0 and the last at time = duration. The duration is defined
by the last event in the trajectory.
An event describes the location of a sound source at a defined
instant in time. Thus it has a duration of 0 and can be defined
by just a start time. Conversely, scenes, tracks, and trajectories
have start and end times.
Trajectories cannot overlap within a track. Similarly, multiple
events cannot occur at the same time within a trajectory.
HURON TECHNICAL MANUAL PAGE 124