According to one embodiment, a method for manufacturing a semiconductor device is disclosed. Digital data is transmitted with a degree of noise immunity by generating and transmitting a reference signal along with the transmitted digital data signal. Among stored audio data stored in the buffer, audio data for left and right channels and for a front center channel are then subjected to the phase transformation. Alternative embodiments are provided. The combination of these enhancements, working together, will allow an engine system to consistently meet the mandated performance requirements via tighter lambda control in the presence of set point changes and load disturbances.