| z | ||
Z(2x)= | ||
| z−2 |
| z | ||
(z2Y(z)−z2y0−zy1)−(zY(z)−zy0)= | ||
| z−2 |
| z | ||
(z2−z)Y(z)= | ||
| z−2 |
| 1 | ||
Y(z)= | ||
| (z−1)(z−2) |
| Y(z) | 1 | ||
= | |||
| z | z(z−1)(z−2) |
| 1 | A | B | C | ||||
= | + | + | |||||
| z(z−1)(z−2) | z | z−1 | z−2 |
| 1 | ||
A= | ||
| 2 |
| 1 | ||
B+C=− | ||
| 2 |
| 3 | ||
−2B−C= | ||
| 2 |
| 1 | ||
A= | ||
| 2 |
| 1 | 1 | |||
C=− | −(−1) , C= | |||
| 2 | 2 |
| 1 | 1 | 1 | 1 | 1 | 1 | ||||||
= | * | − | + | * | |||||||
| z(z−1)(z−2) | 2 | z | z−1 | 2 | z−2 |
| Y(z) | 1 | 1 | 1 | 1 | 1 | ||||||
= | * | − | + | * | |||||||
| z | 2 | z | z−1 | 2 | z−2 |
| 1 | z | 1 | z | |||||
Y(z)= | − | + | * | |||||
| 2 | z−1 | 2 | z−2 |
| 1 | ||
yx= | δx−1+2x−1 | |
| 2 |