engineering recuitment GATE ECE 2023-24 Test Series Signals and Systems Fourier Series Forms of Fourier Series
The signum function is given by
\(sgn\left( x \right) = \left\{ {\begin{array}{*{20}{c}} {\frac{x}{{\left| x \right|}};x \ne 0}\\ {0;x = 0} \end{array}} \right.\)
The Fourier series expansion of \(sgn\left( {cos\left( t \right)} \right)\) has
1
only sine terms with all harmonics
2
only cosine terms with all harmonies
3
only sine terms with even numbered harmonies.
4
only cosine terms with odd numbered harmonies