Specifications

Chapter 32: TL Space TDM and TL Space Native 197
Impulse Response (IR) and
TL Space
This section covers aspects of impulse response
(IR) and TL Space.
IR Processing Control Lag
Adjusting some controls in TL Space requires
the impulse computer to recalculate the wave-
form and reload it into the convolution proces-
sor. This operation uses DSP and host process-
ing capacity. When this occurs, some control lag
may be experienced. This should be kept in
mind if controls are being automated in real
time during a session.
How Impulse Responses Are Captured
An IR of an actual physical space is captured us-
ing a combination of an impulse sound source
and capture microphones. The sound source is
used to excite the physical space to create a re-
verb, and can be a starter pistol or a frequency
tone played through a speaker. The micro-
phones can be placed in various configurations.
The resulting IR is then processed to create a
digital representation of both the physical
space, potentially colored by the sound source
and the type of microphone used. Likewise, an
IR can be captured of effects hardware, such as
analog reverbs, by sending a test pulse through
the unit and capturing the result digitally. In ad-
dition to reflecting reverb or delay characteris-
tics, an IR also reflects tonal character and can
be used for a variety of effects beyond pure re-
verb applications.
Depending on the capture technique used, the
IR may be suitable for use with mono, stereo,
surround or a combination of those formats. For
example, a capture setup with a single sound
source and two microphones is ideal for a mono
to stereo IR.
Multiple IRs may be taken of a physical space
where the sound source has been moved to phys-
ical locations. Each resulting IR may be used to
create individual reverbs for separate instru-
ments. This effectively allows an engineer to
place each instrument in the reverb sound field
as if the instruments were physically arranged in
the space.
TL Space IR Library Installation
If you purchased the boxed version of TL Space,
it includes an installer disc of the standard
TL Space IR Library. If you purchased TL Space
online, you will need to download IR Libraries
from Avid’s TL Space Online IR Library. For
more information on downloading and install-
ing IR Libraries from the TL Space Online IR Li-
brary, see “Installing TL Space IR Packages” on
page 207.
To install the TL Space IR Library from disc:
1 Insert the correct TL Space IR library installer
disc for your operating system (Windows or
Macintosh) in your computer’s CD/DVD drive.
2 Double-click the TL Space IR library installer
application to launch it. Read the license agree-
ment. If you agree to the terms, click
Accept.
3 Click Install to perform an easy install of the
entire IR library on the system drive.
4 If you want to install only part of the library,
select
Custom Install and select the parts of the li-
brary you want to install.
5 When the installation is completed, click Quit
to finish the installation.