Applied Biosystems Data Explorer 4 Series User Manual page 247

Type of Data
Noisy, low-resolution
data
High-resolution data,
but the Noise
Removal method
may yield better
results
Noisy, low-resolution
data, chromatogram
data, or Voyager
PSD data
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:
Suggested
Method
Default No associated value is displayed. Default
smoothing smoothing is a self-adjusting Gaussian filter
(RSM) that uses the Peak Resolution (specified in the
Peak Detection Setup dialog box) to calculate
the optimum number of smoothing points to
(May affect
apply at every mass point. See Figure 3-3 on
peak
page 3-12.
resolution.)
NOTE: Default smoothing is not available for
PSD data.
Noise Specify a Correlation Factor of 0 to 1.0.
Filter (NF)
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.
(May affect
peak If applying the Noise Filter with a certain
resolution.) 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.
Gaussian Specify a Filter Width in data points (odd
Smooth integers only). The maximum number of
(SM) smoothing points is 2001. Points less than 1
Filter Width from the edge of the spectrum are
not smoothed.
(May affect
peak
resolution.)
Data Explorer
Noise Filtering/Smoothing
Description
™
Software User's Guide
5
5-43