Noise Filtering/Smoothing

 

 

 

 

 

 

 

Type of Data

Suggested

 

Description

 

 

Method

 

 

 

 

 

 

 

 

 

 

 

 

 

High-resolution data

Noise

Specify the number of standard deviations of

 

 

 

Removal

noise to remove. The software automatically

 

 

 

(NR)

calculates the average white noise for all

 

 

 

 

frequencies across the spectrum, then

 

 

 

(Does not

removes the specified number of standard

 

 

 

deviations of noise. This method slightly

 

 

 

affect peak

 

 

 

affects peak intensity, and removes peaks with

 

 

 

resolution.)

 

 

 

a signal-to-noise ratio less than the specified

 

 

 

 

 

 

 

 

standard deviation.

 

 

 

 

In general:

 

 

 

 

 

If you set

% White Noise

 

 

 

 

Std Dev to:

removed is:

 

 

 

 

1

68

 

 

 

 

2

95

 

 

 

 

3

99

 

 

 

 

If applying Noise Removal with a certain Std

 

 

 

 

Dev does not yield the necessary noise

 

 

 

 

removal, return to the original trace (see

 

 

 

 

 

 

 

“Returning to the original trace” on page 4-4)

 

 

 

 

and apply the Noise Removal again with a

 

 

 

 

higher Standard Deviation setting. Applying

 

4

 

 

the Noise Removal more than one time with

 

 

 

 

 

 

 

the same Standard Deviation setting will not

 

 

 

 

improve noise removal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.Click OK.

The trace is displayed with an NF, SM, or NR trace label.

4.To return to the original trace, see “Returning to the original trace” on page 4-4.

Data Explorer™ Software User’s Guide

4-19