Communication apparatus and wireless communication system

A communication apparatus that performs information transmission between a first communication device group and a second communication device group via wireless communication performed by radio waves of mutually different frequencies, the communication apparatus comprising:

• a voice input means for inputting a voice emitted from a voice/reception output terminal of the first communication device group into a microphone input terminal a of the second communication device group;
• another voice input means for inputting a voice emitted from a voice/reception output terminal of the second communication device group into a microphone input terminal of the first communication device group;
• a controller;
• and
• a selector switch,
• wherein the voice input means produces a signal emitted from the voice/reception output terminal of the first communication device group to be inputted into a PTT contact signal converter such that a PTT button signal of the second communication device group comes into an ON state,
• wherein the other voice input means produces a signal emitted from the voice/reception output terminal of the second communication device group to be inputted into a PTT contact signal converter of the second communication device group such that a PTT button signal of the first communication device group comes into an ON state, and
• wherein the controller determines whether the voice has been emitted from the first communication device group or whether the voice has been emitted from the second communication device group,
• wherein if the controller determines that the voice has been emitted from the first communication device group, the controller brings the PTT button signal of the communication device of the second communication device group into an ON state through a first PTT contact signal converter and the controller transmits the voice to the second communication device group, and, if the controller determines that the voice has been emitted from the second communication device group, the controller brings the PTT button signal of the first communication device group into an ON state through a second PTT contact signal converter and transmits the voice to of the first communication device group, and
• wherein, based on a determination made by the controller, the selector switch performs switching between the voice input means for inputting a voice emitted from the first communication device group into the second communication device group and the other voice input means for inputting the voice emitted from a the second communication device group into the first communication device group.