| 摘要 |
A vocabulary memory which contains descriptions of vocabulary elements is addressable by a code which is formed by a number designating a vocabulary element, but the set of useful codes for a given user comprises gaps (32-38) between groups of consecutive numbers which are referred to as segments (24-31). The vocabulary memory contains segments which are arranged end to end and the receiver comprises an auxiliary memory which contains, for a given segment (27), the smallest and largest code values of this segment and the position in the vocabulary memory of descriptions corresponding to the codes contained in this segment, as well as the addresses (225, 230) in said auxiliary memory of data of two other segments (25, 30) of the sequence of segments, some of which are situated above and some of which are situated below said given segment etc. in order to form a classification in the form of a tree.
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