Huron & SNAP Documentation

Configuring HeadScape
↓ To configure HeadScape
Note: Configuration is required each
time any of the HeadScape
Parameters change, this is illustrated
by the un-dimming of the Configure
button when changes have been made
to the HeadScape setup.
Saving
HeadScape files and the HeadScape File Format
THE SIMULATION TOOLS
2. Click Delete, the selected *.htr file will be removed from the
list.
Once the angle channel, front impulses and end impulses have
been selected the HeadScape application needs to be
configured. Configuration entails the booting of DSPs and
loading of filter series into the DSP card’s memory to allow
realtime switching of early impulses.
• Click Configure.
HeadScape will load the required DSP filters and load the
impulse responses into memory. Once HeadScape is
configured the Configure button will dim.
Once configured and saved in a workspace, the current
configuration of HeadScape will be restored when that
workspace is loaded.
HeadScape uses a collection of impulse responses in *.SIM files
to represent an acoustic space. Acoustic modelling programs
(such as CATT Acoustic) have the ability to generate these SIM
files automatically. A pair of short *.SIM files exist for each
angle of head rotation for a particular listening position.
Another pair of long SIM files exist which represent the
reverberant tail of the impulse response for the room.
The relationship between the short SIM files and the angles of
head rotation they represent is defined in a “HeadTurn” (*.htr)
file. The HeadTurn is a text file containing a list of numbers
with the following format
aaa.a eee.e
aaa.a represents an angle from 0 to 360 degrees with 0.5 degree
resolution. This angle is the angular position of the head for the
specified source-receiver simulation.
eee.e represents an elevation from +180 to -180 degrees with
0.5 degree resolution. This angle is the elevation of the head for
the specified source-receiver simulation.
HURON TECHNICAL MANUAL PAGE 120