| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmitter that can properly monitor voice in a vehicle with less traffic. SOLUTION: The transmitter is provided with a VOX(voice operated transmission) circuit 15 that radio transmits an emergency code repetitively at a prescribed transmission interval. When the VOX circuit 15 detects a voice signal, the VOX circuit 15 radios the emergency code and the voice signal (an in-vehicle monitor signal) in succession to the command, until the VOX circuit 15 cannot detect the voice signal. When the transmission timing of the emergency code at the repetition interval overlaps with the transmission timing of the in-vehicle monitor signal, the transmission of the emergency code at the repetition is put off.
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