FrequencyWeightingB (FPScript)
Calculates the frequency weighting B according to IEC 651 for an input signal or a signal series.
Syntax
FrequencyWeightingB(Signal [ , InputWeighting = FREQUENCYWEIGHTING_LINEAR ])
The syntax of the FrequencyWeightingB function consists of the following parts:
Part |
Description |
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Signal |
A signal or a signal series with variations in time. The sampling rate must be at least 4 kHz. Permitted data structures are signal und signal series. All numeric data types are permitted. The argument is transformed to the unit V. For the X component additional restrictions do apply. For complex data types the absolute value is formed. If the argument is a list, then the function is executed for each element of the list and the result is also a list. |
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InputWeighting |
Frequency weighting of the input signal or the input signal series. The argument InputWeighting can have the following values:
If the argument is a list, then the first element in the list is taken. If this is also a list, then the process is repeated. If this argument is omitted, it will be set to the default value FREQUENCYWEIGHTING_LINEAR. |
Remarks
The result has the same structure as the argument Signal.
A-weighting as input weighting is not possible, since a B-weighted output signal cannot be calculated from an A-weighted input signal with meaningful accuracy.
Available in
Option Acoustics
Observed Standards
Standard |
Description |
|---|---|
IEC 651 |
Sound level meter |
From a sampling rate of the input signal of 40 kHz onwards, precision class 1 is observed, from a sampling rate of 80 kHz onwards, precision class 0 applies.
The deviations observed for sampling rates between 40 kHz and 80 kHz lie only in the frequency bands above 12.5 kHz (16 kHz and 20 kHz), since these are too close to the half sampling rate.
Examples
FrequencyWeightingB(TimeSignal, FREQUENCYWEIGHTING_LINEAR) |
Calculates the frequency weighting B for the signal 'TimeSignal'. The signal does not have an input weighting. |