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labview 高级信号处理包手册
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labview 高级信号 处理 手册 This manual contains a brief introduction to time-frequency analysis, includes information about linear and quadratic methods of time-frequency analysis, and describes how to develop typical applications by using the LabVIEW Time Frequency Analysis Tools.
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LabVIEW
TM
Advanced Signal Processing Toolkit
Time Frequency Analysis Tools User Manual
Time Frequency Analysis Tools User Manual
June 2008
371552B-01
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© National Instruments Corporation v Time Frequency Analysis Tools User Manual
Contents
About This Manual
Conventions ...................................................................................................................ix
Related Documentation..................................................................................................x
Chapter 1
Introduction to Time-Frequency Analysis
Common Time-Frequency Analysis Applications ........................................................1-4
Overview of Time Frequency Analysis Tools ...............................................................1-5
Finding Example VIs.......................................................................................1-6
Related Signal Processing Tools....................................................................................1-6
Chapter 2
Understanding Linear Time-Frequency Analysis Methods
Short-Time Fourier Transform ......................................................................................2-2
Window Type and Window Length ................................................................2-3
Discrete Gabor Transform and Expansion.....................................................................2-4
Adaptive Transform and Expansion ..............................................................................2-7
Comparing Linear Time-Frequency Analysis Methods ................................................2-13
Chapter 3
Understanding Quadratic Time-Frequency Analysis Methods
STFT Spectrogram.........................................................................................................3-2
Reassignment Method .....................................................................................3-6
Wigner-Ville Distribution..............................................................................................3-7
Other Cohen’s Class Time-Frequency Distributions.....................................................3-10
Choi-Williams Distribution .............................................................................3-11
Cone-Shaped Distribution ...............................................................................3-13
Gabor Spectrogram ........................................................................................................3-14
Adaptive Spectrogram ...................................................................................................3-20
Spectrogram Feature Extraction ....................................................................................3-22
Mean Instantaneous Frequency .......................................................................3-23
Mean Instantaneous Bandwidth ......................................................................3-23
Group Delay ....................................................................................................3-23
Marginal Integration........................................................................................3-24
Creating Quadratic Time-Frequency Analysis Applications.........................................3-24
Comparing Quadratic Time-Frequency Analysis Methods ...........................................3-25
Calculating the Energy of a Signal at Each Time-Frequency Instant............................3-27
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