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    • 9. 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。