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phono PreAmp Studio USB (English)
7. Denoiser
The
Denoiser
belongs to the noise reduction systems. It does not require any special coding
method prior to recording, such as that required by the familiar tape noise reduction system
by DOLBY™ Lab. The Denoiser efficiently removes all types of wideband noises
from recorded
audio tracks. The
Algorithmix
®
Denoiser
is used to remove tape hiss, static noise in telephone
clips and residual noise on old records after they have been edited using the
Descratcher
.
This version of the
Denoiser
uses a typical wideband noise print that has been optimized for
reducing surface noise on vinyl records and tape hiss.
The noise reduction process of the
Denoiser
is controlled by only two parameters, making it
easy to optimize the results for various output material.
The frequency band of the input signal (red), the noise print used for processing the audio
material (white) and the frequency band of the output signal after processing (green) can be
viewed in the
Analyzer
window.
The noise print (white) indicates the threshold value beyond which no more noise reduction
takes place. You can move this noise print up and down using the
threshold
parameter. You
can also use this parameter to adjust the noise print so that it is just above the background-
noise level. At a specific
threshold
, the
reduction
parameter then determines the range of
removed noise within the selected noise print.
A good starting point for the
threshold
is to set the noise print just above the background-
noise level (at about 10 dB). Increasing the
reduction
parameter would then reduce the back-
ground noise significantly. If distortions such as whistling sounds or robot-like noises (caused
by the phenomenon called
time aliasing
) are clearly audible, decreasing the
reduction
pa-
rameter and increasing the
threshold
(to about 30 dB above the background-noise level) usu-
ally helps.
