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According to Fourier analysis, square wave can be represented as ________

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According to Fourier analysis, square wave can be represented as ________

(a) fundamental sine wave and even harmonics

(b) fundamental sine wave and odd harmonics

(c) fundamental sine wave and harmonics

(d) fundamental and sub harmonic sine wave

This question was posed to me during an online interview.

The question is from Detection of AM Waves in division Amplitude Modulation of Analog Communications

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Right choice is (b) fundamental sine wave and odd harmonics

The explanation: A square wave is a non-sinusoidal periodic waveform with steady frequency, in which the amplitude alternates between a fixed maximum and minimum value. According to Fourier analysis, an ideal square wave, with amplitude one, can be represented as an infinite sum of sinusoidal waves. An ideal square wave contains only components of odd integer harmonics.

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