# ThdWeight Function

Returns a real array of 34 elements containing the weighting coefficients from 10Hz to 20kHz. The weighting coefficient vector can be used to calculate the weighted THD of a time-domain vector using a FFT. Note that the

The weighting coefficients are defined in the IEC 61672-1 and IEC 60537 publications. For further information, see the \externalreference{IEC Website}{http://www.iec.ch}.

### Arguments

 Number Type Compulsory Default Description 1 String Yes The type of weighting to return

#### Argument 1

Specifies the type of weighting, one of:

• "a" A-type weighting
• "b" B-type weighting
• "c" C-type weighting
• "d" D-type weighting

The weighting coefficient argument is not case sensitive.

### Returns

Return type: real array

Vector of weighting coefficients with reference values from 10Hz to 20kHz.