groupDelay

Group delay of digital downconverter or digital upconverter filter cascade

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Syntax

D = groupDelay(Conv,N)
[D,F] = groupDelay(Conv,N)

Description

D = groupDelay(Conv,N) returns a vector of group delays, D, of a digital downconverter or digital upconverter, Conv, evaluated at N frequency points. The frequency points are equally spaced around the upper half of the unit circle.

[D,F] = groupDelay(Conv,N) returns a vector of frequencies, F, at which the group delay has been computed.

example

Examples

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Open Live Script

Compute the group delays of the digital downconverter using the groupDelay function.

Create a dsp.DigitalDownConverter System object with the default settings.

dwnConv = dsp.DigitalDownConverter
dwnConv = 
  dsp.DigitalDownConverter with properties:

           DecimationFactor: 100
         MinimumOrderDesign: true
                  Bandwidth: 200000
    StopbandFrequencySource: 'Auto'
             PassbandRipple: 0.1000
        StopbandAttenuation: 60
                 Oscillator: 'Sine wave'
            CenterFrequency: 14000000
        NormalizedFrequency: false
                 SampleRate: 30000000

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Use the groupDelay function to compute the vector of group delays. By default, the function evaluates the group delays at 8192 frequency points equally spaced around the upper half of the unit circle.

D = groupDelay(dwnConv);

Plot the vector of group delays.

plot(D)
xlabel('Number of frequency points')
ylabel('Group delay')

Figure contains an axes object. The axes object with xlabel Number of frequency points, ylabel Group delay contains an object of type line.

Determine the vector of frequencies over which the group delays are computed and plot them.

[D,F] = groupDelay(dwnConv);
plot(F,D)
xlabel('Frequencies')
ylabel('Group delay')

Figure contains an axes object. The axes object with xlabel Frequencies, ylabel Group delay contains an object of type line.

Input Arguments

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Digital downconverter or digital upconverter, specified as a dsp.DigitalDownConverter or dsp.DigitalUpConverter System object™.

Number of frequency points over which the group delays are evaluated, specified as a positive scalar. These points are equally spaced around the upper half of the unit circle.

Data Types: double | single

Output Arguments

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Vector of group delays of the digital downconverter or digital upconverter, evaluated at N frequency points equally spaced around the upper half of the unit circle.

Data Types: double

Frequencies at which the group delays are evaluated, returned as a column vector.

Data Types: double

Version History

Introduced in R2012a

See Also

Functions

Objects