One of the simplest way of combining codes to form new codes is to take their direct product. Direct product of cyclic codes and various generalizations have been studied for many years. In this note, we survey cyclic product codes, direct product of various generalizations of cyclic codes and their properties.

翻译：将各种编码合并成新编码的最简单方式之一是直接取得新编码,多年来一直研究各种周期编码的直接产品和各种概括,在本说明中,我们调查了各种周期编码及其特性的各种一般分类的直接产品,即周期产品编码。