What is symmetrical square wave?

A Square Wave Waveform is symmetrical in shape and has a positive pulse width equal to its negative pulse width resulting in a 50% duty cycle . Square wave waveforms are used in digital systems to represent a logic level “1”, high amplitude and logic level “0”, low amplitude.

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What is Fourier transform of square pulse?

That pulse is half the period of the square wave above. It has a Fourier transform of X(f)=10−3sinc(10−3f) X ( f ) = 10 − 3 s i n c ( 10 − 3 f ) The figure below shows the amplitude spectrum of the square pulse, |X(f)| as a blue line, and the amplitude of the Fourier series of the square wave, |Xk| as red stars.

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