In a method and apparatus for encoding a tag with an n-bit binary code one or more predetermined frequency sources are associated with the tag that produce known different respective characteristic frequencies, each of which is associated with a known unique position in the n-bit binary code. The present invention has fundamentally solved the problem of low probability of success in uplink synchronization establishment. Moreover, the rule trees are weighted to increase the probability of predicting the desired character and to be quickly adaptable to different users having different language styles or vocabularies. A covering that is transparent to the radiation from the optoelectronic semiconductor body is applied to at least the front side of the semiconductor body. 91 is etched, a plating coating is formed on the surface.