X(z) is the z-transform of the signal x(n), then what is the z-transform of the signal nx(n)?
A. -z(dX(z))/dz
B. zdX(z)/dz
C. -z-1dX(z)/dz
D. z-1(dX(z))/dz
Answer:A
X(z) is the z-transform of the signal x(n), then what is the z-transform of the signal nx(n)?
A. -z(dX(z))/dz B. zdX(z)/dz C. -z-1dX(z)/dz D. z-1(dX(z))/dz
Explanation: From the definition of z-transform, we have