A Sinusoid with Missing Periods

Started by qasim_chaudhari 5 years ago8 replieslatest reply 5 years ago122 views

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Reply by bholzmayerFebruary 15, 2018

I would set up a sort of PLL.

Its output should give a steady sinus without missing periods.
Needs to be locked to the incoming Signal.
Depending on its setup it has same frequency and phase.

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Reply by arkkimedeFebruary 15, 2018

Did you try with the FFT.

A spike have to be present in the spectrum.

Using right relationship between time/freqeuncy you can define the frequency and the period.

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Reply by dudelsoundFebruary 15, 2018

Looks like a PSK (phase-shift-keying) modulated carrier to me - that leads me to support bholzmayer's suggestion to use a PLL to reconstruct the carrier...

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Reply by dudelsoundFebruary 15, 2018

Another thing: Depending on what you mean by "reconstructing the sine wave" the solution might very well be simpler. if you just need to know the frequency of the sine (and not the exact phase) you can just measure the distance of the zero-crossings to get your period of course...

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Reply by kazFebruary 16, 2018

Not quite a PSK case to me because the missing value section is empty

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Reply by dudelsoundFebruary 19, 2018

right! OOK then :)

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Reply by qasim_chaudhariFebruary 15, 2018
Great suggestions all. I will work on these pointers and see how it goes.