A storage device and a control device include a first DSP, a second DSP, and a Servo MPU for controlling a position of a head with respect to a storage medium. The gas blender may be incorporated into a Continuous Positive Airway Pressure device. The envelope magnitude predictor outputs an estimate for the magnitude of the envelope that will be generated when the inputted baseband signals are modulated. In one embodiment, the reciprocal of an accumulated duration of the non-uniform time intervals is a linear function of a number of time intervals after the reset command. By reducing the maximum propagation delay in comparison with previously known arrangements of address decoders the speed at which the memory can be operated is increased.