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Owning Palette: Preprocessing VIs

Installed With: Advanced Signal Processing Toolkit

Preprocesses univariate or multivariate (vector) time series by moving average, resampling, detrending, or exponential average.

Dialog Box Options

Block Diagram Inputs

Block Diagram Outputs

Dialog Box Options

Parameter	Description
Data Source	Specifies 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. Waveform and TXT files can contain single-channel or multi-channel data. WAV files can contain only single-channel data.
File Path Configuration	Contains 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 if you select From file in the Data Source section. Ask user 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 if you select From file in the Data Source section.
System Dimensions	Specifies the dimensions of the input signal. Options include Single channel and Multiple channels. System Dimensions is available only when you select From terminal in Data Source. When you select From file in Data Source, this VI determines the dimensions of the input time series automatically according to the file content.
Data Type	Specifies the data type for the input signal or signals. Options include Array and Waveform. Data Type is available only when you select From terminal in Data Source. When you select From file in Data Source, this VI determines the data type of the input time series automatically according to the file content.
Configuration	Contains the following options: Method—Specifies the method to use in preprocessing a time series. Contains the following options: Moving Average (default) Resampling Detrending Exponential Average Channel—Specifies the channel of the input time series and the processed time series. This option is available only when you select Multiple channels in System Dimensions. Sampling rate—Specifies the sampling rate of the input time series.
Algorithm settings	Specifies the settings for the preprocessing algorithm. Contains the following options: Method of moving average—Specifies the filter type to use in filtering the input time series. Options include Spencer (default) and Henderson. This option is available only when you select Moving Average from the Method list. New sampling rate—Specifies the sampling rate for the resampled time series. This option is available only when you select Resampling from the Method list. Method of detrend—Specifies the curve-fitting method to use in estimating the trend. Options include Linear (default), Quadratic, Cubic, N-polynomial, and Exponential. This option is available only when you select Detrending from the Method list. Polynomial order—Specifies the polynomial order to use in the N-polynomial fit. The value of this parameter must be greater than or equal to 0. This option is available only when you select N-polynomial from the Method of detrend list. View trend—Specifies whether to display the trend of the time series. The default is FALSE. This option is available only when you select Detrending from the Method list. Exponential type—Specifies the type of the exponential function. This option is available only when you select Exponential Average from the Method list. Contains the following options: Single (default) Double Triple Season period—Specifies the length of the seasonal pattern in the input time series. This option is available only when Exponential type is Triple. Season type—Specifies the way in which this Express VI models the seasonality. This option is available only when Exponential type is Triple. Contains the following options: Multiplicative (default) Additive Level—Specifies the weight for the level cumulant. The value must be a number between 0 and 1. This option is available only when you select Exponential Average from the Method list. Trend—Specifies the weight for the trend cumulant. The value must be a number between 0 and 1. This option is available only when Exponential type is Double or Triple. Season—Specifies the weight for seasonal cumulant. The value must be a number between 0 and 1. This option is available only when Exponential type is Triple.
Original and Processed Signal	Displays the original and processed time series.

Block Diagram Inputs

Parameter	Description
error in (no error)	Describes error conditions that occur before this VI or function runs.
Xt	Specifies the input time series. Xt is available only when you select From terminal in Data Source.
File path	Specifies the file path of the data you want to load.This input is available only if you select the From file option in the Data Source section.

Block Diagram Outputs

Parameter	Description
error out	Contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Xt filtered	Returns the filtered time series. This output is available only when you select Moving Average from the Method list.
Xt resampled	Returns the resampled time series. This output is available only when you select Resampling from the Method list.
Xt detrended	Returns the detrended time series. This output is available only when you select Detrending from the Method list.
Trend	Returns the trend of the input time series. This output is available only when you select Detrending from the Method list.
Xt averaged	Returns the averaged time series. This output is available only when you select Exponential Average from the Method list.

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

TSA Detrend
TSA Exponential Average
TSA Moving Average
TSA Resampling