TC Electronic Broadcast 6000 - Manual (Page 187)

Backdrop
English Manual 183
Backdrop
The BackDrop algorithm occupies:
– @ Normal Sample Rate: 1/4 DSP Resource
– @ Double Sample Rate: Not available
The inputs and outputs of this algorithm are dis-
tributed as follows:
Input Output
L
E1
E2
E3
E4
L
R R
Backdrop algorithm – introduction
The BackDrop noise reduction system was de-
signed to provide the maximum amount of noise
reduction without audibly altering the underlying
signal. Since noise removal systems can also
remove part of the signal, BackDrop’s funda-
mental philosophy is to remove the noise with as
little processing as possible. That is, BackDrop
monitors the incoming signal and continuously
decides the perceptually optimal processing
to apply. This is accomplished using advanced
mathematical algorithms resulting from more
than seven years of research. BackDrop’s three
patented algorithm models allow you to apply
the processing with surgical precision while leav-
ing the music undisturbed. BackDrop lets you
choose the algorithm model that best suits the
noise you want to reduce.
BackDrop’s Basic model provides a simple set
of controls that are perfect for removing com-
mon broadband noises such as tape hiss. The
MultiBand model expands your control by al-
lowing you to divide the noise reduction process
into three independent frequency bands. This
gives you full control to shape the noise reduc-
tion across frequency in such a way that you can
maximize the noise reduction without damaging
the signal. Finally, the MultiType model separates
the noise into three components (Buzz, Room,
and Hiss) and lets you choose how much of each
noise component to reduce.
BackDrop was specifically designed to remove
noises found in today’s world (hums and buzz-
es, room rumble, air conditioning systems, tape
hiss, etc.) and is not intended to be used for re-
moving clicks and pops.
As an integral part of each of its three algorithm
models, BackDrop includes a complex model of
the human auditory system. BackDrop continu-
ously listens to the incoming signal and removes
only the parts of the noise that the ear can hear.
BackDrop offers two unique controls (Basilar
Dispersion and Transient Recovery) to adjust
certain parameters in the ear model. The ear
model is another key component in BackDrop’s
philosophy of applying as little processing as
possible to the incoming signal so that only the
noise is removed, not the music.
Backdrop algorithm – main page
Backdrop algorithm – main page
BackDrop’s main screen allows you to set cer-
tain global parameters.
Algorithm Model
Allows you to select between the Basic, Multi-
Band and MultiType algorithm models. These
models are described below in detail. You can
instantly switch between models at any time and
the settings for each model are recalled.
Processing Mode
The Processing Mode control allows you to alter-
nate between BackDrop’s two modes of opera-
tion – Stereo or M/S (mid/side). In Stereo mode,
BackDrop assigns a separate noise reduction
process to the Left and Right channels while in
M/S mode, BackDrop assigns a noise reduction
process to the Mid signal and another to the Side