visualize

Visualize and validate filter response

Syntax

visualize(weightFilt)

visualize(weightFilt,N)

visualize(___,mType)

hvsz = visualize(___)

Description

visualize(weightFilt) plots the magnitude response of the frequency-weighted filter weightFilt. The plot is updated automatically when properties of the object change.

visualize(weightFilt,N) uses an N-point FFT to calculate the magnitude response.

visualize(___,mType) creates a mask based on the class of filter specified by mType, using either of the previous syntaxes.

hvsz = visualize(___) returns a handle to the visualizer as a dsp.DynamicFilterVisualizer object when called with any of the previous syntaxes.

Examples

Plot Weighting Filter Magnitude Response

Create a weightingFilter System object™ and then plot the magnitude response of the filter.

weightFilt = weightingFilter;
visualize(weightFilt)

Specify Number of Frequency Bins in FFT Calculation

Create a weightingFilter System object™. Plot a 1024-point frequency representation.

weightFilt = weightingFilter;
visualize(weightFilt,1024)

Visualize Class 2 Standard-Compliance Mask

Create a weightingFilter System object™. Visualize the class 2 compliance of the filter design.

weightFilt = weightingFilter;
visualize(weightFilt,'class 2')

Input Arguments

weightFilt — Object of weightingFilter

object

Object of the weightingFilter System object™.

N — Number of DFT bins

2048 | positive scalar

Number of DFT bins in frequency-domain representation, specified as a positive scalar. The default is 2048.

Data Types: single | double

mType — Type of mask

'class 1' (default) | 'class 2'

Type of mask, specified as 'class 1' or 'class 2'.

The mask attenuation limits are defined in the IEC 61672-1:2002 standard. The mask is defined for A-weighting and C-weighting filters only.

• If the mask is green, the design is compliant with the IEC 61672-1:2002 standard.

• If the mask is red, the design breaks compliance.

Note

The pole-zero values defined in the ANSI S1.42-2001 standard are used for designing the A-weighted and C-weighted filters. The pole-zero values are based on analog filters, so the design can break compliance for lower sample rates.

Data Types: char

Version History

Introduced in R2016b