how to find normalized centered instantaneous of amplitude,phase and frequency using matlab code?

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Redflower
Redflower 2018-6-4
评论： edu ab 2018-9-7
I work in digital modulation classification using neural network as first step is to extract feature I chose spectral feature which based on find instantaneous amplitude, phase and frequency. can anyone help me how to find them?

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Shrey Joshi
Shrey Joshi 2018-8-3
For instantaneous frequency you can use instfreq function in Signal processing tool. You can also look at following doc. https://www.mathworks.com/help/signal/ug/hilbert-transform-and-instantaneous-frequency.html. As shown in the doc link: For monocomponent signals: z = hilbert(inputData); instantaneous amplitude = abs(z) ; instantaneous phase = unwrap(angle(z)) ; For multicomponent signals: you can compute spectrogram and track the peaks of the power spectral density for computing instantaneous amplitude and frequency (see tfridge)

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