The composition of a homopolymer of aromatic diester compound using a catalyst and a glycol is provided. In response to either malfunction, a control device is actuated for automatically shutting down operation of the machine. The multi-rate encoder and decoder system further includes a decoder having a set of decoder inputs and a set of decoder outputs corresponding to the mother code and a decoder select unit capable of ignoring transitions in the trellis code produced by the encoder that belong to the mother code but not to the subset code.