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    • 21. 发明授权
    • Novel disazo compounds, process for the preparation of same and
application of said disazo compounds and analogues thereof to
electrophotographic sensitive materials
    • 新型双偶氮化合物,其制备方法和所述双偶氮化合物及其类似物应用于电子照相感光材料
    • US4251614A
    • 1981-02-17
    • US921086
    • 1978-06-30
    • Masaomi SasakiKiyoshi SakaiMitsuru HashimotoMasafumi OhtaKyoji Tsutsui
    • Masaomi SasakiKiyoshi SakaiMitsuru HashimotoMasafumi OhtaKyoji Tsutsui
    • C09B35/34G03G5/06
    • C09B35/34G03G5/0683G03G5/0685
    • The present invention provides disazo compounds expressed by the general formula: ##STR1## [wherein A represents a member selected from the group consisting of ##STR2## (wherein X represents a member selected from the group consisting of aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as indole ring, carbazole ring, benzofuran ring, etc. and their substituents, Ar.sub.1 represents a member selected from the group consisting of aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as dibenzofuran ring, etc. and their substituents, Ar.sub.2 and Ar.sub.3 represent a member selected from the group consisting of aromatic rings such as benzene ring, naphthalene ring, etc. and their substituents, R.sub.1 and R.sub.3 represent a member selected from the group consisting of hydrogen, lower alkyl radical or phenyl radical and their substituents and R.sub.2 represents a member selected from the group consisting of lower alkyl radical, carboxyl radical and their esters)]; a process for the preparation of said compounds; and electrophotographic sensitive materials having a high sensitivity as well as a high flexibility which comprise a conductive support and a photosensitive layer formed thereon, said photosensitive layer containing said disazo compound as an effective ingredient.
    • 本发明提供由以下通式表示的双偶氮化合物:其中A表示选自下列的成员:其中X表示选自以下的成员:芳环如 苯环,萘环等杂环,吲哚环,咔唑环,苯并呋喃环等杂原子及其取代基,Ar 1表示选自苯环,萘环等芳香环的成员 ,诸如二苯并呋喃环等杂环及其取代基,Ar2和Ar3表示选自芳环如苯环,萘环等的基团及其取代基,R 1和R 3表示选自 由氢,低级烷基或苯基组成的组和它们的取代基,R 2表示选自低级烷基,羧基和 酯)]; 一种制备所述化合物的方法; 和具有高灵敏度的电子照相感光材料以及包含导电性支持体和形成在其上的感光层的高柔性,所述感光层含有所述双偶氮化合物作为有效成分。
    • 27. 发明授权
    • Two-dimensional discrete cosine transform computing circuit
    • 二维离散余弦变换计算电路
    • US5719963A
    • 1998-02-17
    • US454867
    • 1995-05-31
    • Kimihiko KazuiKiyoshi SakaiKiichi MatsudaAkira Nakagawa
    • Kimihiko KazuiKiyoshi SakaiKiichi MatsudaAkira Nakagawa
    • H04N7/30G06F17/14G06T1/20G06T9/00H03M7/30H04N1/41G06K9/20G06F15/00G06K9/38
    • G06F17/147G06T9/007
    • A two-dimensional discrete cosine transform computing circuit has a transform block, formed by a multiplication unit and a Hadamard transform unit, which performs computations in a sequence of Hadamard transforms followed by multiplications in a two-dimensional discrete cosine transform, and in a sequence of multiplication followed by Hadamard transforms in an inverse two-dimensional discrete cosine transform. A memory block temporarily stores input/output data of the transform block; an input/output processing block performs pre-processing and post-processing such as cumulative addition and subtraction of input/output data of the transform block. A control block controls, when performing processing for either a two-dimensional discrete cosine transform or inverse two-dimensional discrete cosine transform, multiplications of coefficients in the transform block, read/write of the memory block, and the input/output processing block. This configuration achieves high-speed processing and a reduction in scale of the circuitry.
    • 二维离散余弦变换计算电路具有由乘法单元和Hadamard变换单元形成的变换块,该单元在Hadamard变换序列中进行计算,随后在二维离散余弦变换中进行乘法,并以序列 的乘法,然后是逆二维离散余弦变换中的Hadamard变换。 存储块临时存储变换块的输入/输出数据; 输入/输出处理块执行诸如变换块的输入/输出数据的累积加法和减法的预处理和后处理。 当执行二维离散余弦变换或反向二维离散余弦变换的处理时,控制块控制变换块中的系数乘法,存储块的读/写和输入/输出处理块。 该配置实现了高速处理和电路规模的缩小。