A signal x (t) has Fourier transform given by

X (ω) = 1;              |ω| < 1

= 0;                    |ω| > 1

Another signal given by\(\;y\left( t \right)\; = \;\frac{{{d^2}x\left( t \right)}}{{d{t^2}}}\), then the value of \(\mathop \smallint \limits_{ - \infty }^\infty {\left| {y\left( t \right)} \right|^2}dt\) is ________