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Owning Palette: Discrete Wavelet VIs

Installed With: Advanced Signal Processing Toolkit

Reconstructs a signal with subband coefficients. Wire data to the path coef input to determine the polymorphic instance to use or manually select the instance.

Example

Use the pull-down menu to select an instance of this VI.

Select an instance WA Arbitrary Path Reconstruction (waveform)WA Arbitrary Path Reconstruction (array)

WA Arbitrary Path Reconstruction (waveform)

	source specifies the coefficients for reconstructing the time waveform. 0 all coef—Reconstructs the original input signal from path coef and residual info. 1 path coef (default)—Reconstructs the bandpass signal from path coef. 2 residual coef—Reconstructs the residual signal after bandpass filtering from residual info.
	path coef contains the coefficients of the subband that the path input of the WA Arbitrary Path Decomposition VI defines.
	residual info specifies the information about the complementary subbands at each level. The residual paths describe these complementary subbands. For example, when path is 101, the residual paths include path 0, path 11, and path 100. This VI uses the complementary subbands information for signal reconstruction. coef contains the coefficients on the residual paths. For example, when path is 101, coef includes the coefficients on path 0, path 11, and path 100. length contains the length of the coefficients on the residual paths and the signal length. For example, when path is 101, length includes the signal length and the lengths on path 0, path 11, and path 100. residual path contains the residual paths.
	wavelet specifies the wavelet type of the discrete wavelet analysis. The default is db02. The options include two types: orthogonal (Haar, Daubechies (dbxx), Coiflets (coifx), Symmlets (symx)) and biorthogonal (FBI, Biorthogonal (biorx_x)), where x indicates the order of the wavelet. wavelet must be the same type as the wavelet type you selected in the WA Arbitrary Path Decomposition VI to compute path coef and residual info. If you used the analysis filters input of the WA Arbitrary Path Decomposition VI to specify wavelet, ignore this input and use the synthesis filters input of this VI to specify the synthesis filters of the wavelet.
	error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
	synthesis filters specifies the coefficients of the lowpass synthesis filters and the highpass synthesis filters for the wavelet you specify. If you specify a value for synthesis filters, the VI ignores the settings in the wavelet input. You can use the Wavelet Design Express VI to design the analysis filters and the corresponding synthesis filters. lowpass specifies the coefficients of the lowpass synthesis filter, which the VI uses to filter the interpolated approximation coefficients in the wavelet reconstruction. highpass specifies the coefficients of the highpass synthesis filter, which the VI uses to filter the interpolated detail coefficients in the wavelet reconstruction.
	signal contains the reconstructed signal.
	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. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

WA Arbitrary Path Reconstruction (array)

	source specifies the coefficients for reconstructing the time waveform. 0 all coef—Reconstructs the original input signal from path coef and residual info. 1 path coef (default)—Reconstructs the bandpass signal from path coef. 2 residual coef—Reconstructs the residual signal after bandpass filtering from residual info.
	path coef contains the coefficients of the subband that the path input of the WA Arbitrary Path Decomposition VI defines.
	residual info specifies the information about the complementary subbands at each level. The residual paths describe these complementary subbands. For example, when path is 101, the residual paths include path 0, path 11, and path 100. This VI uses the complementary subbands information for signal reconstruction. coef contains the coefficients on the residual paths. For example, when path is 101, coef includes the coefficients on path 0, path 11, and path 100. length contains the length of the coefficients on the residual paths and the signal length. For example, when path is 101, length includes the signal length and the lengths on path 0, path 11, and path 100. residual path contains the residual paths.
	wavelet specifies the wavelet type of the discrete wavelet analysis. The default is db02. The options include two types: orthogonal (Haar, Daubechies (dbxx), Coiflets (coifx), Symmlets (symx)) and biorthogonal (FBI, Biorthogonal (biorx_x)), where x indicates the order of the wavelet. wavelet must be the same type as the wavelet type you selected in the WA Arbitrary Path Decomposition VI to compute path coef and residual info. If you used the analysis filters input of the WA Arbitrary Path Decomposition VI to specify wavelet, ignore this input and use the synthesis filters input of this VI to specify the synthesis filters of the wavelet.
	error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node. status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE. code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
	synthesis filters specifies the coefficients of the lowpass synthesis filters and the highpass synthesis filters for the wavelet you specify. If you specify a value for synthesis filters, the VI ignores the settings in the wavelet input. You can use the Wavelet Design Express VI to design the analysis filters and the corresponding synthesis filters. lowpass specifies the coefficients of the lowpass synthesis filter, which the VI uses to filter the interpolated approximation coefficients in the wavelet reconstruction. highpass specifies the coefficients of the highpass synthesis filter, which the VI uses to filter the interpolated detail coefficients in the wavelet reconstruction.
	signal contains the reconstructed signal.
	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. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred. code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code. source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

Example

Refer to the Engine Knocking Detection VI in the labview\examples\Wavelet Analysis\WAApplications.llb for an example of using the WA Arbitrary Path Reconstruction VI.