Li, Lan; Cheng, Zhengxing Characteristics of orthogonal two-direction wavelet packets. (Chinese. English summary) Zbl 1240.42170 J. Ningxia Univ., Nat. Sci. Ed. 31, No. 4, 317-320 (2010). Summary: The concept of orthogonal two-direction wavelet packets with dilation 3 is given. The theoretical framework of orthogonal two-direction wavelet packets is developed. The properties of two-direction wavelet packets are discussed. It is shown that orthogonal two-direction wavelet packets not only have the characteristic of wavelet packets, but also are more flexible in application. MSC: 42C40 Nontrigonometric harmonic analysis involving wavelets and other special systems Keywords:two-direction wavelets; two-direction multiresolution analysis; two-direction scaling functions; orthogonality PDF BibTeX XML Cite \textit{L. Li} and \textit{Z. Cheng}, J. Ningxia Univ., Nat. Sci. Ed. 31, No. 4, 317--320 (2010; Zbl 1240.42170)