![]() Correlazione elevata |
![]() Correlazione media |
![]() Correlazione nulla |
![]() Correlazione elevata |
![]() Correlazione media |
![]() Correlazione nulla |
fs | apparato | Ts | 10 ⁄ Ts |
2.4⋅103 | Modem (anni ’80) | 4.2⋅10 − 3 | 24 KHz |
28.8⋅103 | Modem (anni ’90) | 3.5⋅10 − 5 | 288 KHz |
10⋅106 | LAN | 10 − 7 | 100 MHz |
100⋅106 | Fast Ethernet | 10 − 8 | 1 GHz |
crc-12 | G(x) = x12 + x11 + x3 + x2 + x + 1 |
crc-16 | G(x) = x16 + x15 + x2 + 1 |
crc-ccitt | G(x) = x16 + x12 + x5 + 1 |
crc-32 | G(x) = x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1 |
a b | ⊕ |
0 0 | 0 |
0 1 | 1 |
1 0 | 1 |
1 1 | 0 |
a b | × |
− 1 − 1 | 1 |
− 1 1 | − 1 |
1 − 1 | − 1 |
1 1 | 1 |
em | ym(n) | cn | cn | cnym(n) | δ |
+ | + | ↓ | + | + | ↓ |
+ | + | ↓ | − | − | ↓ |
+ | − | ↑ | + | − | ↓ |
+ | − | ↑ | − | + | ↓ |
− | + | ↑ | + | + | ↑ |
− | + | ↑ | − | − | ↑ |
− | − | ↓ | + | − | ↑ |
− | − | ↓ | − | + | ↑ |