Common mode chokes in series with these two paths can greatly reduce the noise without affecting the signal. They work as a simple wire against differential currents and as an inductor against the common mode currents due to magnetic flux flowing inside the core of the ferrite. Seen here in the first diagram, two inductors or even chip bead ferrites can be used to clip the noise. This will work in some applications where the output signal can be affected without creating problems. The signal output will be distorted on the rising and falling edges, because of cutting the needed harmonics for a square signal. Video applications and digital applications where sharp on and off times are needed will not appreciate this use of parts, otherwise the receiver is not able to detect the information in the signal. Looking at the second diagram, users insert a common mode choke instead of two inductor or chip bead ferrites. The current on the desired signal path and the current on the electrical noise path will cancel out reducing the noise but leaving the signal intact.