Repeater and relay method for the same

A repeater comprising:

• a reception unit configured to receive a signal in the form of pulses;
• a permission signal generating unit configured to detect a state of the pulses of the signal, and generate a permission signal that permits a relay of the signal when the permission signal generating unit detects the pulses, and that inhibits the relay of the signal when the permission signal generating unit detects an end of the pulses;
• and
• a transmission unit configured to transmit the signal during a time period permitted by the permission signal,
• wherein the permission signal generating unit is configured to:
• set, when detecting the end of the pulses, a pulse re-input monitoring period for the permission signal, the pulse re-input monitoring period being a time period provided to determine whether or not pulses of the signal are re-detected;
• and
• determine that the signal continues when detecting the pulses of the signal during the pulse re-input monitoring period, and determine that the signal ends when not detecting the pulses of the signal during the pulse re-input monitoring period.