How to get Complex sound field representation from real pressure signals

Question

Benoit Meriot 2017-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/359980-how-to-get-complex-sound-field-representation-from-real-pressure-signals

回答： Suze Zhang 2017-10-9

Hello, I'm trying to simulate a sound received by an antennae (linear, of five microphones). To do so, i used the phased array toolbox and the wideBandCollector object to simulate the signal received by each microphones depending on the incidence of arrival (hypothesis of planar waves)

I want the sound source to be a white noise so i used the 'wgn' function.

Here's my question : once I have my temporal signal for each microphone, i would like to do some mathematical treatmeent on them. But to do so, I would need to use the complex representation of the signal (complex exponentials) How can I transform my signal into such a representation ?

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Star Strider 2017-10-6

fft (link) ?

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Answer 1

Suze Zhang 2017-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/359980-how-to-get-complex-sound-field-representation-from-real-pressure-signals#answer_284945

Hi Benoit,

I agree with the comment Star posted above using function "fft". Here is also another link to an example performing basic frequency-domain signal analysis:

https://www.mathworks.com/help/signal/examples/practical-introduction-to-frequency-domain-analysis.html