dbu

Syntax

Output = dbu(freq,mag)

Output = dbu(freq,mag,ref)

Inputs

freq

The vector of frequency values.

Type: double

Dimension: vector

mag

The spectral magnitudes corresponding to freq.

Type: double

Dimension: vector

ref

The optional decibel reference (default: 1.0).

Type: integer

Dimension: scalar

Outputs

Output

The weighted response.

Type: double

Dimension: vector

Example

Plot the U weights in decibels with log spacing for frequency.

freq = logspace(1,5,100);
mag = ones(1,length(freq));
output = dbu(freq, mag);
semilogx(freq, output);

Figure 1. dbu figure 1

Comments

U-weighting dampens the ultra-sonic components of the input curve. Output is not converted to decibels, which can be done when plotting.

The magnitude vector is divided by the reference and then weighted.