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Continuous Convolution (FIR) (Not in Base Package)

LabVIEW 8.2 Help
August 2006

NI Part Number:
371361B-01

»View Product Info

Convolves single or multiple waveforms and one or more kernels with state, allowing subsequent calls to be processed in a continuous manner. If you are convolving multiple waveforms, the VI maintains separate convolution states for each waveform.

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

Continuous Waveform Convolution for 1 Chan

reset forces the internal history buffer to be reset to zero when it is TRUE.
signal in is the signal to be convolved with kernel.
kernel is the sequence by which signal in is convolved.
algorithm specifies the method used for computing the convolution. When algorithm is set to direct, the VI computes convolution using the direct form of linear convolution:

x*y[i] = Sum(x[k]y[i-k])

When algorithm is set to frequency domain (default), the VI computes convolution using an FFT-based technique.

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.
delay output with half kernel length causes signal out to be delayed in time by half the length of the kernel when TRUE. Half kernel length is computed by

0.5*N*dt

where N is the number of elements in kernel, and dt is from signal in.
signal out is the result of the convolution of the of signal in and kernel.
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.

Continuous Waveform Convolution for N Chan

reset forces the internal history buffer to be reset to zero when it is TRUE.
signals in are the signals to be convolved with kernels.
signal in is the signal to be convolved with kernel.
kernels are the sequences by which signals in are convolved.
algorithm specifies the method used for computing the convolution. When algorithm is set to direct, the VI computes convolution using the direct form of linear convolution:

x*y[i] = Sum(x[k]y[i-k])

When algorithm is set to frequency domain (default), the VI computes convolution using an FFT-based technique.

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.
delay output with half kernel length causes signal out to be delayed in time by half the length of the kernel when TRUE. Half kernel length is computed by

0.5*N*dt

where N is the number of elements in kernel, and dt is from signal in.
signals out is the result of the convolution of each element of signals in with the corresponding row of kernels.
signal out is the result of the convolution of the of signal in and kernel.
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.

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