Specifications

Chapter 69: DINR 335
Chapter 69: DINR
Digidesign Intelligent Noise Reduction (DINR)
plug-in provides BNR, broadband and narrow-
band noise reduction. BNR can be used for sup-
pressing such unwanted elements as tape hiss,
air conditioner rumble, and microphone pre-
amp noise.
The Broadband Noise Reduction module (BNR)
removes many types of broadband and narrow-
band noise from audio material. It is best suited
to reducing noise whose overall character
doesn’t change very much: tape hiss, air condi-
tioner rumble, and microphone preamp noise.
In cases where recorded material contains sev-
eral types of noise, the audio can be processed
repeatedly according to the specific types of
noise.
DINR is available for Pro Tools|HD systems as a
real-time TDM version and as an AudioSuite
version of the BNR.
DINR LE is available for Pro Tools host-based
systems as an AudioSuite-only version of the
BNR.
How Broadband Noise
Reduction Works
The Broadband Noise Reduction module uses a
proprietary technique called Dynamic Audio
Signal Modeling
™
to intelligently subtract the
noise from the digital audio file. Noise is re-
moved with multiple downward expanders that
linearly decrease the gain of a signal as its level
falls.
Creating a Noise Signature
The first step in performing broadband noise re-
duction is to create what is called a noise signa-
ture by selecting and analyzing an example of
the noise within the source material. Using this
noise signature, a noise contour line is created
which is used to define the thresholds for the
downward expanders that will perform the
broadband noise reduction. The noise contour
represents an editable division between the
noise and non-noise audio signals.
The TDM version of BNR is not supported at
sample rates above 96 kHz. The AudioSuite
version of BNR supports 192 kHz.
BNR TDM