Eleven Categories of Line Noise
4. Intermodulation noise (a special type of cross talk)
- The signals from two circuits intermodulate and form a new signal that falls into a frequency band different from those reserved for the two signals (in multiplexing)
Echoes and echo suppression can cause errors.
- an echo suppressor causes a change in the electrical balance of a circuit, which may reflect signals back down the circuit
- when echo suppressors are dismissed as in data transmission, echoes may cause errors
- normally, however, echoes have such a low signal rate that they are not bothersome