Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2007 Sep 17;3:219–230.

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2007 The authors.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Figure 2. — The zoomed-in power spectral density of SetA_UT1 (0–5,000 Hz). The power spectral density clearly shows 1/f noise in the low frequency region. The DC offset is not zero even though the means of the individual mass spectra of noise from instrumentation were removed before the Burg algorithm for segments was applied. The DC offset may be explained by the bias between the true mean and the mean estimates of the mass spectra and the effect of 1/f noise near 0 Hz.