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How to use spectrum analyzer object to show a signal waveform ?

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Claudia
Claudia 12 Sep 2016
답변: Honglei Chen 12 Sep 2016
I am using the function SpectrumAnalyzer. How do I use it with a waveform?
Fs = 2500; Sineobject1 = dsp.SineWave('SamplesPerFrame',1024,'SampleRate',Fs,'Frequency',100); Sineobject2 = dsp.SineWave('SamplesPerFrame',1024,'SampleRate',Fs,'Frequency',1000); SA = dsp.SpectrumAnalyzer('SampleRate',Fs,'NumInputPorts',2,'PlotAsTwoSidedSpectrum',... false,'ChannelNames',{'SinewaveInput','NotchOutput'},'ShowLegend',true);

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Honglei Chen
Honglei Chen 12 Sep 2016
You can set FrequencyResolutionMethod to 'Window length' to manually adjust the length of signal used to compute the spectrum, e.g.,
Fs = 2500;
Sineobject1 = dsp.SineWave('SamplesPerFrame',1024,'SampleRate',Fs,'Frequency',100);
Sineobject2 = dsp.SineWave('SamplesPerFrame',1024,'SampleRate',Fs,'Frequency',1000);
SA = dsp.SpectrumAnalyzer('SampleRate',Fs,'NumInputPorts',2,'PlotAsTwoSidedSpectrum',...
false,'ChannelNames',{'SinewaveInput','NotchOutput'},'ShowLegend',true,...
'FrequencyResolutionMethod','WindowLength');
step(SA,step(Sineobject1),step(Sineobject2))

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