A signal processing device having a video signal input, a circuit for processing a video signal, a generating device for generating a character signal, and a memory for storing the video signal to be processed and for storing the character signal generated by the generating device. The drive train and system includes some wheels driven by an engine, and other wheels driven by a motorized machine. The control unit only opens the auxiliary valve to fluidly communicate the auxiliary air output with the air compressor when a predetermined operating condition of the vehicle is sensed by the condition sensor. An error detector, responsive to the error syndromes, detects a number of errors in the received codeword C\u2032, and a plurality of counters count a number of times the number of errors falls within a predetermined plurality of ranges to thereby provide a distribution of the errors. Thus, the three dimensional shape of the photoresist pattern approaches a desired three dimensional shape.