AWeighting

AWeighting('Spectrum','type'=0)

Arguments

'Spectrum'

Spectrum

'Type'

Specification of the type

Description

This function weights a spectrum according to the so-called A-weighting. This is a weighting filter that corresponds to human hearing.

Example

After applying this function, a spectrum can be assessed with regard to the perceptible noise emission. The rating has the following types:

  • A: levels from approx. 20 phon to 40 phon

  • B: levels from approx. 50 phon to 70 phon

  • C: levels from approx. 80 phon to 90 phon

  • D: for high sound pressures
DbScale

DbScale('Spectrum','ref'=1)

Arguments

'Spectrum'

Spectrum to scale logarithmically

'Reference'

Optional

Description

This function provides a logarithmic scaling in dB for a signal spectrum. For a meaningful result, the input must be the amplitude of a spectrum.