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

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Claudia 2016-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/302745-how-to-use-spectrum-analyzer-object-to-show-a-signal-waveform

回答： Honglei Chen 2016-9-12

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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Answer 1

Honglei Chen 2016-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/302745-how-to-use-spectrum-analyzer-object-to-show-a-signal-waveform#answer_234489

在 MATLAB Online 中打开

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))