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This paper describes a novel data transmission system for the air-cushion type biomedical measurement system. Conversational data transmission via coaxial cable sometimes intimidates the patients; the electric cable near the bed is not desirable for medical doctors and nurses, either. To solve this problem, we developed an FM transmission system that is battery driven and transmits signals from DC to several kHz. The signal to be transmitted by the proposed FM wireless transmitter is measured by a pneumatic sensing system.