Huron & SNAP Documentation

THE SIMULATION TOOLS
• Angle channel: The messaging channel over which
information relating the orientation of a virtual sound or a
listener object is passed. Location channel numbers must be
in the range 1 to 255, as channel 0 is reserved in most
applications.
• Tracking device: A device used for obtaining and sending
positional and rotational data. This data is then transformed
(by the Tracker application) into location and angle data for
use as an input to a simulation application.
• Speaker array: A real world array of speakers designed for
the playback of audio simulations.
Additional terms can be found in the Glossary subsection of the
Huron Technical Specifications of this manual.
In general terms an aural simulation is composed of a
processing application — the simulation application — and a
series of inputs to this application. The diagram below (Figure
20) illustrates a generic simulation tool and lists the sources of
inputs and outputs of the system.
Figure 20 — A schematic of a generic Simulation application
The simulation application is the core of an aural simulation. It
takes the sound sources, location information, angle
information, and room effects as inputs, and processes all of this
information in real time to provide the outputs of the simulation
either as B-format encoded signals (as in Sound Field Filter) or
in a form ready to be output to a speaker array or headphones
(Binscape, Space Array , MultiScape, HeadScape or a
combination of Sound Field Filter and one of the AniScape
Decoder tools).
An important concept shown in this diagram (Figure 20) is the
association of the manipulable virtual sound objects and the
sound sources they represent. The sources and objects are
associated using Location and Angle channels. While the real
world sound sources remain stationary (locked into equipment
racks etc.) the sound objects may be moved around the
HURON TECHNICAL MANUAL PAGE 68