fundamental period

Let $f(t)$ be a periodic signal with fundamental period $T_0>0$. Consider the signal $y(t)=f(\alpha t)$, where $\alpha>1$. The Fourier series expansions of $f(t)$ and $y(t)$ are gi...

The radian frequency value(s) for which the discrete time sinusoidal signal $x[n] = A \cos(\Omega n + \pi/3)$ has a period of 40 is/are __.

Consider the signal $f(t) = 1 + 2 \cos(\pi t) + 3 \sin(\frac{2\pi}{3} t) + 4 \cos(\frac{\pi}{2} t + \frac{\pi}{4})$, where t is in seconds. Its fundamental time period, in seconds,...

Consider a discrete time periodic signal x$$\left[ n \right]$$= $$\sin \left( {{{\pi n} \over 5}} \right)$$. Let a k be the complex Fourier serier coefficients of x$$\left[ n \righ...

Which of the following signals is/are periodic?