it will be obvious to one of ordinary skill in the art that the present invention may be practiced without these specific details in other instances well known methods procedures components and circuits have not been described in detail as not to unnecessarily obscure aspects of the present invention some portions of the detailed descriptions which follow are presented in terms of procedures logic blocks processing and other symbolic representations of operations on data bits within a computer memory these descriptions and representations are the means generally used by those skilled in data processing arts to effectively convey the substance of their work to others skilled in the art a procedure logic block process etc is here and generally conceived to be a self consistent sequence of steps or instructions leading to a desired result the steps include physical manipulations of physical quantities usually though not necessarily these quantities take the form of electrical magnetic optical or quantum signals capable of being stored transferred combined compared and otherwise manipulated in a computer system it has proven convenient at times principally for reasons of common usage to refer to these signals as bits values elements symbols characters terms numbers or the like it should be borne in mind however that all of.