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

3 次查看（过去 30 天）

Redflower 2018-6-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403856-how-to-find-normalized-centered-instantaneous-of-amplitude-phase-and-frequency-using-matlab-code

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?

2 个评论
显示无隐藏无

Greg Heath 2018-6-5

Length of signal? Sampling rate?

Redflower 2018-8-6

Length 1001 Sampling rate 100

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Shrey Joshi 2018-8-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403856-how-to-find-normalized-centered-instantaneous-of-amplitude-phase-and-frequency-using-matlab-code#answer_331524

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)