# freqz

Frequency response of filters in channelizer

## Description

`[`

computes a matrix of complex frequency responses for each filter in the `H`

,`w`

] = freqz(`obj`

)`dsp.Channelizer`

System object™. Each column of `H`

corresponds to the frequency
response for one of the filters in the channelizer. `w`

is a
vector of normalized frequencies at which the rows of `H`

are
computed.

`[`

computes the frequency response of the filters with indices corresponding to the
elements in the vector `H`

,`w`

] = freqz(`obj`

,`ind`

)`ind`

. `ind`

is a row
vector of indices between `1`

and
`obj.NumFrequencyBands`

. By default, this vector is
[1:*N*], where *N* is the number of frequency
bands.

For example, to compute the frequency response of the first 4 filters, set
`ind`

to
`[1:4]`

.

channelizer = dsp.Channelizer; [H,w] = freqz(channelizer,[1:4]);

`[`

computes the frequency response of the filters with additional options specified by
one or more `H`

,`f`

] = freqz(`obj`

,`ind`

,`Name,Value`

)`Name,Value`

pair arguments.

For example, to specify a sampling rate of 44100 Hz, set `'Fs'`

to `44100`

. To compute the frequency response using 1024 frequency
points, set `'NFFT'`

to `1024`

. In addition, to
compute the sum of the frequency response of the filters, set
`'overall'`

to
`true`

.

channelizer = dsp.Channelizer; [H,f] = freqz(channelizer,[1:4],'Fs',44100,'NFFT',1024,'overall',true);

## Examples

## Input Arguments

## Output Arguments

## Version History

**Introduced in R2017b**

## See Also

### Functions

`coeffs`

|`tf`

|`polyphase`

|`fvtool`

|`bandedgeFrequencies`

|`centerFrequencies`

|`getFilters`