how to determine the highest peak and its frequency for a real time sound signal

Question

Taieb Cheikh 2017-11-13

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回答： Taieb Cheikh 2017-11-16

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Answer 1

Taieb Cheikh 2017-11-13

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在 MATLAB Online 中打开

here is my program :

SamplesPerFrame = 3073;
Microphone = dsp.AudioRecorder('SamplesPerFrame', SamplesPerFrame,...
                               'OutputDataType','double');
Fs = Microphone.SampleRate; 
Spectra = dsp.SpectrumAnalyzer('SampleRate',Fs,'PlotAsTwoSidedSpectrum',false,...
                               'SpectralAverages',20,'FrequencyScale','Log'); 
tic;
while toc < 100000
    audioIn= step(Microphone);
    step(Spectra,audioIn);
    audio=audioIn(:,1);
    [pk1,lc1] = findpeaks(audio,'SortStr','descend','NPeaks',3);
end 
release(Microphone);
release(Spectra);

what should I do to get the frequency of the highest peak ???

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Answer 2

Chris Loizou 2017-11-13

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Hi Taieb, well it would be nice if you could be more specific about the frequency of the signal you want to process. Do you need the frequency of the highest peak? Because a signal is actually made from multiple sine waves so to say that you need only one frequency would be a mistake. if you need to know the frequency of the highest peak that's another thing. In order ot find the highest peak you can check the function findpeaks on matlab ( https://www.mathworks.com/help/signal/ref/findpeaks.html) or just search for the max value in your data.

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Answer 3

Taieb Cheikh 2017-11-13

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thank you for your reply indeed , I need to know the frequency of the highest peak

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Christakis Loizou 2017-11-13

well if you need to know the frequency of the highest peak do the fft. Or if you know the time(seconds) differnce between two max peaks then the frequency=1/time.

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