Specifications

Chapter 11: TL Space TDM and TL Space Native 89
Impulse Responses
IR Processing Overheads
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 processing
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 dig-
ital 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 re-
verbs, by sending a test pulse through the unit
and capturing the result digitally. In addition to
reflecting reverb or delay characteristics, an IR
also reflects tonal character and can be used for
a variety of effects beyond pure reverb applica-
tions.
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
physical locations. Each resulting IR may be
used to create individual reverbs for separate in-
struments. This effectively allows an engineer to
place each instrument in the reverb sound field
as if the instruments were physically arranged in
the space.
Impulse Response Formats
TL Space reads a wide range of IR formats auto-
matically, including WAV, SDII, and AIFF file
formats, allowing you to import a variety of IRs.
TL Space supports IR sample rates from 22 kHz
up to 96 kHz in bit depths from 16 to 32 bits. In
addition, TL Space supports the display of JPEG
format picture files stored with IRs.
To use third party IR libraries with TL Space:
1 In the IR Browser, select Edit > Import Other
IR Folder.
2 Locate and select the library on your hard
drive.
3 Click Choose.
TL Space will add the new library to the IR
browser.