Weighting (Arbitrary Rate) VIs

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Sound and Vibration Measurement Suite 7.0 Help
Edition: November 2008

Part #: 372416B-01

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Owning Palette: Weighting and Filtering VIs, Weighting VIs

Installed With: Sound and Vibration Measurement Suite. This topic might not match its corresponding palette in LabVIEW depending on your operating system, licensed product(s), and target.

Use the Weighting (Arbitrary Rate) VIs to apply an A-, B-, or C-weighting filter on time-domain signals and to determine the maximum frequency within tolerances according to the ANSI S1.4 or IEC 61672 standard.

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

When combined with any National Instruments DSA device, the Weighting VIs offer compliance with the following standards:

A-, B-, and C-Weighting Filters

ANSI Standards

ANSI S1.4-1983
ANSI S1.42-2001

ISO/IEC Standard

IEC 61672-1:2002

JIS Standard

JIS C 1509-1:2005

Radiocommunications Weighting Filters

ITU-R 468-4

Telecommunications Weighting Filters

ITU-T O.41
Bell System Technical Reference 41009

The Weighting VIs accommodate any sampling frequency and design the filter coefficients to target the attenuation curves defined by the ANSI standards. Given the selected sampling frequency, the compliance with a particular type, either Type 1 or Type 0, is ensured up to a specific frequency. The SVT Max Frequency Within Tolerances VIs return this frequency as the maximum frequency within tolerances.

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

Palette Object	Description
SVT Max Frequency Within Tolerances [ANSI]	Returns the maximum frequency within tolerances according to the ANSI S1.4 standard and based on sampling frequency [Hz], weighting, and type.
SVT Max Frequency Within Tolerances [IEC]	Returns the maximum frequency within tolerances according to the IEC 61672-1 standard and based on sampling frequency [Hz], weighting, and class.
SVT Weighting Filter	Applies the selected weighting to scaled signal [EU]. The data type you wire to the scaled signal [EU] input determines the polymorphic instance to use.