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    • 22. 发明授权
    • Sampling rate converter
    • 采样率转换器
    • US5389923A
    • 1995-02-14
    • US35228
    • 1993-03-22
    • Eiji IwataTakao Yamazaki
    • Eiji IwataTakao Yamazaki
    • H03H17/00H03H17/02H03H17/06H04N7/01H03M7/00
    • H03H17/0685H04N7/0102
    • In a sampling rate converter for converting a sampling frequency L of a digital signal to a sampling frequency M (L:M conversion) or for converting a sampling frequency M of a digital signal to a sampling frequency L (M:L conversion), the same filter coefficients are utilized and a constant predetermined DC gain is maintained for both conversions. An over-sampler multiplies the sampling frequency L or M by M or L, respectively, during the L:M conversion and the M:L conversion, respectively. A filter, which receives the output of the over-sampler, restricts the frequency band of the output. A CPU supplies filter coefficients to the filter and performs such functions as quantizing the filter coefficients, arranging the quantized filter coefficients into a three-dimensional array including rows and columns, determining a ratio between a total sum of values of the rows and columns of the array of quantized filter coefficients, and correcting each of the quantized filter coefficients in response to the determined ratio so as to maintain the predetermined DC gain. A down-sampler receives the output of the filter for multiplying the rate converted frequencies by 1/L or 1/M during the L:M conversion or the M:L conversion, respectively.
    • 在用于将数字信号的采样频率L转换为采样频率M(L:M转换)或用于将数字信号的采样频率M转换为采样频率L(M:L转换))的采样率转换器中, 使用相同的滤波器系数,并且为两个转换维持恒定的预定DC增益。 分别在L:M转换和M:L转换期间,过采样器将采样频率L或M分别乘以M或L。 接收过采样器的输出的滤波器限制输出的频带。 CPU向滤波器提供滤波器系数,并执行量化滤波器系数的功能,将量化的滤波器系数布置成包括行和列的三维阵列,确定行和列的值的总和之间的比率 量化滤波器系数阵列,并且响应于所确定的比率校正每个量化滤波器系数,以便维持预定的DC增益。 下采样器接收滤波器的输出,分别在L:M转换或M:L转换期间将速率转换频率乘以1 / L或1 / M。
    • 26. 发明授权
    • Method of real time MPEG-4 texture decoding for a multiprocessor environment
    • 多处理器环境的实时MPEG-4纹理解码方法
    • US07724820B2
    • 2010-05-25
    • US11167050
    • 2005-06-23
    • Jeongnam YounTakao Yamazaki
    • Jeongnam YounTakao Yamazaki
    • H04B1/66H04N7/12
    • H04N19/436H04N19/105H04N19/11H04N19/176H04N19/20H04N19/423H04N19/44
    • An apparatus and method is described for performing texture-decoding within a video decoder processing a series of macroblocks within a video bit-stream. The inventive texture decoding is particularly well suited for implementation within decoders incorporating multiple processors. The method separates data independent operations from data dependent (sequential) operations wherein multiprocessing may be efficiently utilized for processing data independent macroblocks. The method preferably makes an assumption as to prediction direction within the set of data dependent operations. A prediction determination is then made and the assumption corrected if necessary with a transposition within the data independent operations operating on the macroblocks. The method reduces the computational overhead and provides for efficiently segmenting operations within a multiprocessing decoder.
    • 描述了在视频解码器内执行纹理解码的装置和方法,该视频解码器处理视频比特流内的一系列宏块。 本发明的纹理解码特别适用于并入多个处理器的解码器内的实现。 该方法将数据无关操作与数据相关(顺序)操作分开,其中可以有效地利用多处理来处理与数据无关的宏块。 该方法优选地对数据相关操作的集合内的预测方向进行假设。 然后进行预测确定,并且如果需要,则在基于宏块的数据独立操作中进行转置来校正假设。 该方法减少了计算开销并且提供了在多处理解码器内的有效分段操作。