getCenterFrequency

Get center frequency

Syntax

CF = getCenterFrequency(npFilter)

Description

CF = getCenterFrequency(npFilter) returns the center frequency of the notch peak filter. If the Specification property is set to 'Coefficients', the center frequency is determined from the CenterFrequencyCoefficient value and the sample rate.

Examples

Get Center Frequency of Notch Peak Filter

Create a dsp.NotchPeakFilter object with the Specification property set to 'Coefficients'.

np = dsp.NotchPeakFilter(Specification='Coefficients')

np = 
  dsp.NotchPeakFilter with properties:

                 Specification: 'Coefficients'
          BandwidthCoefficient: 0.7265
    CenterFrequencyCoefficient: 0

Determine the center frequency of the notch peak filter using the getCenterFrequency function. When the Specification is set to 'Coefficients', the center frequency is determined from the CenterFrequencyCoefficient value and the sample rate.

getCenterFrequency(np)

ans = 
0.5000

Visualize the filter response.

filterAnalyzer(np)

Input Arguments

npFilter — Notch peak filter

dsp.NotchPeakFilter

Notch peak filter whose center frequency is measured, specified as dsp.NotchPeakFilter object.

Output Arguments

CF — Center frequency

scalar

Center frequency of the filter, returned as a scalar.

Data Types: double

Version History

Introduced in R2014a

R2024a: Support for normalized frequencies

In the dsp.NotchPeakFilter object, you can now specify the 3-dB bandwidth and center frequency values in normalized frequency units (0 to 1). To enable this functionality, set the NormalizedFrequency property of the object to true.