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Harmonic analysis problem

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The figure shows a two-component complex tone deviation x dependence on time t. The values on deviation axis are in 1cm intervals and on the time axis, there are 2 cm intervals.


1) Find out the main tone frequency. (Ans. 25kHz, Explain How)
2) Main tone amplitude? (Ans. 7.5 cm , Explain How)
3)Whats the upper/overtone frequency? (Ans. 100kHz, Explain How)
4)Whats the upper/overtone amplitude? (should be 2 cm. , Explain How)

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