Owning Palette: Sound and Vibration VIs

Use the Sound Level VIs to perform sound-level measurements, including linear, exponential, and peak hold averaging. Linear averaging is also known as equivalent continuous sound level, or Leq. The Sound Level VIs do not inherently perform any bandlimiting of the signal. Before the sound level is computed, the sound pressure data can be band limited through the use of analog or digital filters. All level results are returned in dB, and are RMS unless otherwise noted.

The VIs on this palette can return general LabVIEW error codes or specific sound and vibration error codes.

Refer to the labview\examples\Sound and Vibration directory for an example of using the Sound Level VIs.

Palette Object Description
SVL Decimated Exp Avg Sound Level Computes the exponential averaged sound level of scaled signal [EU] of exponential mode and decimates this sound level by decimation factor . scaled signal [EU] should have a zero DC component. You can attenuate the DC component with hardware AC-coupling filters and with software high-pass filters. Wire data to the scaled signal [EU] input to determine the polymorphic instance to use or manually select the instance.
SVL Exp Avg Sound Level Computes the exponential averaged sound level of scaled signal [EU] . scaled signal [EU] should have a zero DC component. Wire data to the scaled signal [EU] input to determine the polymorphic instance to use or manually select the instance.
SVL Leq Sound Level Computes the linear averaged, or the equivalent continuous sound level (Leq), of scaled signal [EU] . scaled signal [EU] should have a zero DC component. You can attenuate the DC component with hardware AC-coupling filters and with software high-pass filters. Wire data to the scaled signal [EU] input to determine the polymorphic instance to use or manually select the instance.
SVL Peak Sound Level Computes the peak sound level of scaled signal [EU] . scaled signal [EU] should have a zero DC component. You can attenuate the DC component with hardware AC-coupling filters and with software high-pass filters. The peak sound level is the maximum of the absolute values of all measured values. Wire data to the scaled signal [EU] input to determine the polymorphic instance to use or manually select the instance.
SVL Running Leq Sound Level Computes the running equivalent continuous sound level (Leq) of scaled signal [EU] . scaled signal [EU] should have a zero DC component. Wire data to the scaled signal [EU] input to determine the polymorphic instance to use or manually select the instance.
SVT Sound Level Computes several sound level measurements including equivalent continuous level (Leq), running Leq sound levels, exponential averaged sound level, and the peak sound level. Wire data to the scaled signal [EU] input to determine the polymorphic instance to use or manually select the instance.
Subpalette Description
Weighting VIs Use the Weighting VIs to apply a weighting filter on time-domain signals sampled at specific rates. You can choose from acoustic, telecommunication, and radiocommunication filters.