fvtool

Visualize filter bank

Syntax

fvtool(obj)

fvtool(obj,ind)

fvtool(___,Name,Value)

Description

fvtool(obj) visualizes the filters in the filter bank using the Filter Visualization Tool (FVTool).

fvtool(obj,ind) visualizes the filters corresponding to the elements in the vector ind.

fvtool(___,Name,Value) specifies options using one or more Name,Value pair arguments.

Examples

View octaveFilterBank in FVTool

Create an octaveFilterBank object. Call fvtool to visualize the filter bank.

octFiltBank = octaveFilterBank;
fvtool(octFiltBank)

ans = 
  Figure (filtervisualizationtool) with properties:

      Number: []
        Name: 'Figure 1: Magnitude Response (dB)'
       Color: [0.9400 0.9400 0.9400]
    Position: [348 480 583 437]
       Units: 'pixels'

  Use get to show all properties

To visualize a subset of filters in the filter bank, specify the second argument as a row vector of indices between one and the number of filters in the filter bank. If not specified, fvtool visualizes 1 to N filters of the filter bank, where N is the smallest of octFiltBank.NumFilters and 64. Visualize the ninth filter.

fvtool(octFiltBank,9)

ans = 
  Figure (filtervisualizationtool) with properties:

      Number: []
        Name: 'Figure 2: Magnitude Response (dB)'
       Color: [0.9400 0.9400 0.9400]
    Position: [348 480 583 437]
       Units: 'pixels'

  Use get to show all properties

To specify the number of FFT points used to compute the frequency response, use the NFFT name-value pair. Specify that the frequency response is calculated using a 8192-point FFT.

fvtool(octFiltBank,'NFFT',8192)

ans = 
  Figure (filtervisualizationtool) with properties:

      Number: []
        Name: 'Figure 3: Magnitude Response (dB)'
       Color: [0.9400 0.9400 0.9400]
    Position: [348 480 583 437]
       Units: 'pixels'

  Use get to show all properties

View gammatoneFilterBank in FVTool

Create a gammatoneFilterBank object. Call fvtool to visualize the filter bank.

gammaFiltBank = gammatoneFilterBank;
fvtool(gammaFiltBank);

To visualize a subset of filters in the filter bank, specify the second argument as a row vector of indices between one and the number of filters in the filter bank. If not specified, fvtool visualizes 1 to N filters of the filter bank, where N is the smallest of gammaFiltBank.NumFilters and 64. Visualize the ninth filter.

fvtool(gammaFiltBank,9);

To specify the number of FFT points used to compute the frequency response, use the NFFT name-value pair. Specify that the frequency response is calculated using a 8192-point FFT.

fvtool(gammaFiltBank,'NFFT',8192);

Input Arguments

obj — Object to get filter frequency responses from

gammatoneFilterBank | octaveFilterBank

Object to get filter frequency responses from, specified as an object of gammatoneFilterBank or octaveFilterBank.

ind — Indices of filters to calculate frequency responses from

1:max(N,64) (default) | row vector of integers with values in the range [1, N]

Indices of filters to calculate frequency responses from, specified as a row vector of integers with values in the range [1, N]. N is the total number of filters designed by obj.

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: 'NFFT',2048

NFFT — Number of DFT bins

8192 (default) | positive integer

Number of DFT bins, specified as a positive integer.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

Version History

Introduced in R2019a