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Noise Filtering/Smoothing
Data Explorer
™
Software User’s Guide 5-43
5
3. Select the method to use based on the type of data you
are examining, then enter the associated value displayed
for the method you select:
Type of Data
Suggested
Method
Description
Noisy, low-resolution
data
Default
smoothing
(RSM)
(May affect
peak
resolution.)
No associated value is displayed. Default
smoothing is a self-adjusting Gaussian filter
that uses the Peak Resolution (specified in the
Peak Detection Setup dialog box) to calculate
the optimum number of smoothing points to
apply at every mass point. See Figure 3-3 on
page 3-12.
NOTE: Default smoothing is not available for
PSD data.
High-resolution data,
but the Noise
Removal method
may yield better
results
Noise
Filter (NF)
(May affect
peak
resolution.)
Specify a Correlation Factor of 0 to 1.0.
Settings from 0.5 to 0.7 yield acceptable
results for most data. A setting close to 1.0
yields a higher degree of noise reduction.
If applying the Noise Filter with a certain
Correlation Factor does not yield the
necessary noise removal, return to the original
trace (see “Returning to the original spectrum”
on page 5-3) and apply the Noise Filter again
with a higher Correlation Factor setting.
Applying the Noise Filter more than one time
with the same Correlation Factor setting does
not improve noise removal.
Noisy, low-resolution
data, chromatogram
data, or Voyager
PSD data
Gaussian
Smooth
(SM)
(May affect
peak
resolution.)
Specify a Filter Width in data points (odd
integers only). The maximum number of
smoothing points is 2001. Points less than 1
Filter Width from the edge of the spectrum are
not smoothed.