Transmission/reception signal conversion circuit and transmission/reception signal conversion method

A transmission/reception signal conversion circuit, which is connected between a first communication device and a second communication device, comprising:

• a transmission circuit, which inputs a transmission signal transmitted from the first communication device;
• a reception circuit, which receives a reception signal transmitted from the second communication device, converts a signal level of the reception signal to a third predetermined level required for communicating with the first communication device, and outputs the converted reception signal to the first communication device;
• and
• a transmission signal detection circuit, which measures a signal level of the transmission signal, and provides a mode change signal when the signal level of the transmission signal is higher than a second predetermined level,
• wherein, the transmission circuit is enabled when the mode change signal is provided and the reception circuit is enabled when the mode change signal is not provided.

A transmission/reception signal conversion circuit, which is connected between a first communication device and a second communication device, comprising:

• a transmission circuit, which inputs a transmission carrier signal transmitted from the first communication device, converts a frequency of the transmission carrier signal to a first predetermined frequency required for communicating with the second communication device, and outputs the converted transmission carrier signal to the second communication device;
• a reception circuit, which receives a reception signal transmitted from the second communication device;
• and
• a transmission signal detection circuit, which measures a signal level of a transmission signal inputted from the first communication device, and provides a mode change signal when the signal level of the transmission signal is higher than a first predetermined level,
• wherein, the transmission circuit is enabled when the mode change signal is provided and the reception circuit is enabled when the mode change signal is not provided.

A transmission/reception signal conversion circuit, which is connected between a first communication device and a second communication device, comprising:

• a transmission circuit, which inputs a transmission signal transmitted from the first communication device;
• a reception circuit, which receives a reception carrier signal received from the second communication device, converts a frequency of the reception carrier signal to a second predetermined frequency required for communicating with the first communication device, and outputs the converted reception carrier signal to the first communication device;
• and
• a transmission signal detection circuit, which measures a signal level of the transmission signal, and provides a mode change signal when the signal level of the transmission signal is higher than a first predetermined level,
• wherein, the transmission circuit is enabled when the mode change signal is provided and the reception circuit is enabled when the mode change signal is not provided.

A transmission/reception signal conversion method of converting transmission/reception signals exchanged between a first communication device and a second communication device, comprising:

• measuring a signal level of a transmission signal inputted from the first communication device at a transmission signal detection circuit;
• and
• enabling one of a transmission circuit and a reception circuit depending on the signal level of the transmission signal having been measured;
• wherein, when the transmission circuit is enabled, the transmission circuit converts a signal level of the transmission signal to a first predetermined level required for communicating with the second communication device and outputting the converted transmission signal to the second communication device.

A transmission/reception signal conversion method of converting transmission/reception signals exchanged between a first communication device and a second communication device, comprising:

• measuring a signal level of a transmission signal inputted from the first communication device at a transmission signal detection circuit;
• and
• enabling one of a transmission circuit and a reception circuit depending on the signal level of the transmission signal having been measured;
• wherein, when the reception circuit is enabled, the reception circuit converts a signal level of the reception signal transmitted from the second communication device to a second predetermined level required for communicating with the first communication device and outputting the converted reception signal to the first communication device.