Time Series Cepstrum Express VI

LabVIEW 2014 Advanced Signal Processing Toolkit Help

Edition Date: June 2014

Part Number: 372656C-01

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Owning Palette: Correlation and Spectral Analysis VIs

Requires: Advanced Signal Processing Toolkit

Computes the single-sided real cepstrum of a univariate time series.

Dialog Box Options
Block Diagram Inputs
Block Diagram Outputs

Dialog Box Options

ParameterDescription
Data SourceSpecifies whether this Express VI reads data from a block diagram input terminal or from a file. From terminal specifies that this Express VI reads data from a block diagram input terminal. From file specifies that this Express VI reads data from a file. This Express VI can read data from waveform, WAV, or TXT files. The valid format of a TXT data file is a file that contains only a 1D real array.
File Path ConfigurationContains the following options:
  • File path—Specifies and displays the path to the file from which this Express VI reads data. This option is available only when you select From file in the Data Source section.
  • Prompt to choose a file each time this VI runs—Specifies whether this Express VI displays a dialog box that prompts you to select a file each time this Express VI runs. This option is available only when you select the From file option in the Data Source section.
Algorithm SettingsContains the following options:
  • Cepstrum bins—Specifies the number of time points for which this VI computes the cepstrum. The default is 128.
  • Method—Specifies the method to use in computing the cepstrum. Options include AR Model (default) and FFT.
  • AR order—Specifies the order of the autoregressive model. The default is 40. This option is available only when you select AR Model in Method.
  • Method of AR Model—Specifies the method to use in estimating the autoregressive model. Options include Forward-Backward (default), Least-Squares, Yule-Walker, Burg-Lattice, and Geometric-Lattice. This option is available only when you select AR Model in Method.
  • Window—Specifies the time-domain window you apply to the time series. This option is available only when you select FFT in Method.
Signal and WindowDisplays the signal and window. Contains the following option:
  • Display window—Specifies to display the windows that you apply to the time series. This option is available only when you select FFT in Method.
CepstrumDisplays the cepstrum of a univariate time series.

Block Diagram Inputs

ParameterDescription
error in (no error)Describes error conditions that occur before this node runs.
XtSpecifies the time series. Xt is available only when you select From terminal in Data Source.
File pathSpecifies the file path of the data you want to load. This input is available only when you select the From file option in the Data Source section.

Block Diagram Outputs

ParameterDescription
cepstrumReturns information about the single-sided real cepstrum, such as the time range and time increment.
error outContains error information. This output provides standard error out functionality.
unitReturns the selected engineering unit of the estimated power spectral density.

This Express VI operates similarly to the following VIs and functions:

TSA Real Cepstrum

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