Transmitter apparatus and communication system employing a dummy pulse before the start of communication

摘要

A transmitter apparatus has a modulator for modulating a carrier wave to produce a modulated wave having communication data superimposed thereon and a transmitter for transmitting the modulated wave to a receiver apparatus. Before starting communication, the transmitter apparatus transmits a predetermined dummy pulse to the receiver apparatus so as to bring the communication data restored by demodulation in the receiver apparatus into a logic state in which the communication data should be kept when no communication is taking place. This makes it possible to perform correct communication even if the communication data demodulated in the receiver apparatus before the start of communication is not kept in the logic state in which it should be kept when no communication is taking place.