Fourier transform on trig wave

450 Views Asked by At

Find the fourier transform for signal in this picture (sorry for the bad quality) enter image description here

Could it be done like this? The signal is a sum of two triangular waves that are each delayed. $$x(t)=A\Lambda\left( \frac{t+T/2}{T}\right)-A\Lambda\left( \frac{t-T/2}{T}\right)$$ And the fourier transform for delayed signal $F\{x(t+t_d)\}=X(f)\cdot e^{-i2\pi ft_d}$. And the fourier transform for triangular pulse is defined $F\{ \Lambda(t/T)\}=T \operatorname{sinc}^2(\pi fT) $ \begin{align} F\{x(t)\}&=AT \operatorname{sinc}^2(\pi fT)\cdot e^{-i2\pi f (-\frac{T}{2})} -AT \operatorname{sinc}^2(\pi fT)\cdot e^{-i 2 \pi f \frac T2} \\ &=AT \operatorname{sinc}^2(\pi fT)\cdot (e^{i\pi f T} - e^{-i \pi f T}) \\ &=AT \operatorname{sinc}^2(\pi fT)\cdot2i\sin(\pi f T) \end{align}

Is this solution valid?