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  • 1 Johann Radon Institute for Computational and Applied Mathematics Altenberger Straße 69 A-4040 Linz Austria
  • 2 Faculty of Science Cairo University Department of Mathematics Giza Egypt
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Binary and quaternary sequences are the most important sequences in view of many practical applications. Any quaternary sequence can be decomposed into two binary sequences and any two binary sequences can be combined into a quaternary sequence using the Gray mapping. We analyze the relation between the measures of pseudorandomness for the two binary sequences and the measures for the corresponding quaternary sequences, which were both introduced by Mauduit and Sárközy. Our results show that each ‘pseudorandom’ quaternary sequence corresponds to two ‘pseudorandom’ binary sequences which are ‘uncorrelated’.