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LabVIEW
TM
Analysis Concepts
LabVIEW Analysis Concepts
March 2004 Edition
Part Number 370192C-01
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© National Instruments Corporation v LabVIEW Analysis Concepts
Contents
About This Manual
Conventions ...................................................................................................................xv
Related Documentation..................................................................................................xv
PART I
Signal Processing and Signal Analysis
Chapter 1
Introduction to Digital Signal Processing and Analysis in LabVIEW
The Importance of Data Analysis ..................................................................................1-1
Sampling Signals ...........................................................................................................1-2
Aliasing..........................................................................................................................1-4
Increasing Sampling Frequency to Avoid Aliasing.........................................1-6
Anti-Aliasing Filters........................................................................................1-7
Converting to Logarithmic Units...................................................................................1-8
Displaying Results on a Decibel Scale............................................................1-9
Chapter 2
Signal Generation
Common Test Signals....................................................................................................2-1
Frequency Response Measurements..............................................................................2-5
Multitone Generation.....................................................................................................2-5
Crest Factor .....................................................................................................2-6
Phase Generation.............................................................................................2-6
Swept Sine versus Multitone...........................................................................2-8
Noise Generation ...........................................................................................................2-10
Normalized Frequency...................................................................................................2-12
Wave and Pattern VIs ....................................................................................................2-14
Phase Control...................................................................................................2-14
Chapter 3
Digital Filtering
Introduction to Filtering.................................................................................................3-1
Advantages of Digital Filtering Compared to Analog Filtering......................3-1
Common Digital Filters .................................................................................................3-2
Impulse Response............................................................................................3-2
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