Air conditioning system

An air conditioning system, comprising:

• an outdoor unit including an inverter circuit;
• a plurality of indoor units connected to the outdoor unit in a communicable manner;
• and
• communication circuits provided in the outdoor unit and the plurality of indoor units, respectively, for communication between the outdoor unit and the plurality of indoor units, wherein
• the outdoor unit and the plurality of indoor units communicate to each other with a multi-carrier transmission using a communication signal including a plurality of carrier frequencies simultaneously, and
• the communication circuit of each of the plurality of indoor units is configured to:
• include a flag that is set and cleared in correspondence with an influence of noise on the air conditioning system, the flag indicating whether to adjust a signal component in a frequency of the noise;
• when the flag is set, generate the communication signal to limit a signal within a predetermined frequency width within a frequency region of the communication signal based on a tone map that does not include information of a pre-set frequency component of the noise in the carrier frequencies simultaneously used for communication, and
• when the flag is cleared, generate the communication signal based on a tone map that includes all the information of the carrier frequencies simultaneously used for communication.