A semiconductor device having a test mode and a read mode is provided. A first orthogonal signal is generated by performing vector subtraction between first and second fundamental signals having the same amplitude and a phase difference \u03b4\u03b8 therebetween. Each DNS server is associated with the same anycast IP address. A logic trigger circuit triggers ventilatory support in relation to the myoelectrical signal, respiratory flow signal andor respiratory pressure signal to assist respiration of the patient.