From Wikipedia, the free encyclopedia
A
noise print
is part of a technique used in
noise reduction
. A noise print is commonly used in
audio mastering
to help reduce the effects of unwanted noise from a piece of audio. In this case, the noise print would be a recording of the ambient noise in the room, which is then used in
spectral subtraction
to set multiple expanders, effectively
gating out
those frequencies whilst the signal level in that band is lower than that in the noise print. Many
plugins
for studio software can be used to apply noise reduction in this way.
Noise reduction usually results in unwanted
artifacts
, sometimes referred to as "twittering" or "birdies". Different algorithms for noise reduction control these artifacts with varying levels of success.
See also
[
edit
]
- Dark frame
? analogous technique in image noise reduction