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    • 4. 发明授权
    • Method and arrangement for transformation of signals from a frequency to
a time domain
    • 信号从频率变换到时域的方法和装置
    • US5479364A
    • 1995-12-26
    • US82087
    • 1993-06-24
    • Anthony M. JonesKevin D. DewarMartin W. Sotheran
    • Anthony M. JonesKevin D. DewarMartin W. Sotheran
    • H04N1/41G06F17/14G06T1/20H04N7/30G06F7/38
    • G06F17/147
    • An IDCT, or Inverse Discrete Cosine Transform, method decimates a 2-D IDCT into two 1-D IDCT operations and then operates separately on the even and odd pixel input words. In a common processing step, selected input values are passed directly to output adders and subtractors, while others are multiplied by constant, scaled cosine values. In a pre-common processing step, the lowest-order odd input word is pre-multiplied by .sqroot.2, and the odd input words are summed pairwise before processing in a common processing step. In a post-common processing step, intermediate values corresponding to the processed odd input words are multiplied by predetermined coefficients to form odd resultant values. After calculation of the even and odd resultant values, the high-order and low-order outputs are formed by simple subtraction/addition, respectively, of the odd resultant values from/with the even resultant values. The input values are preferably scaled upward by a factor of .sqroot.2. Selected bits of some intermediate resulting data words are optionally adjusted by forcing these bits to either "1" or "0". The IDCT system includes a pre-common processing circuit (PREC), a common processing circuit (CBLK), and a post-common processing circuit (POSTC), which perform the necessary operations in the respective steps. The system also includes a controller (CNTL) to generate signals to control the loading of system latches and, preferably, to time-multiplex the application of the even and odd input words to latches in the pre-common circuit.
    • IDCT或逆离散余弦变换方法将2-D IDCT分解成两个1-D IDCT操作,然后分别对偶数和奇数像素输入字进行操作。 在通常的处理步骤中,所选择的输入值直接传递到输出加法器和减法器,而其他输入值乘以恒定的缩放余弦值。 在预共同处理步骤中,最低阶奇数输入字被预先乘以2ROOT 2,并且奇数输入字在公共处理步骤中处理之前成对加法。 在公知处理步骤中,将与处理的奇数输入字对应的中间值乘以预定系数,以形成奇数合成值。 在偶数和奇数结果值的计算之后,高次和低阶输出分别由奇偶结果值/偶数结果值的简单减法/加法形成。 输入值优选地向上按比例2ROOT 2.通过将这些位强制为“1”或“0”可选地调整某些中间结果数据字的选定位。 IDCT系统包括在各步骤中执行必要操作的预共同处理电路(PREC),公共处理电路(CBLK)和后公共处理电路(POSTC)。 该系统还包括用于产生信号以控制系统锁存器的加载的控制器(CNTL),并且优选地将偶数和奇数输入字的应用时间复用到预共同电路中的锁存器。
    • 7. 发明授权
    • Method and arrangement for transformation of signals from a frequency to
a time domain
    • 信号从频率变换到时域的方法和装置
    • US5590067A
    • 1996-12-31
    • US404067
    • 1995-03-14
    • Anthony M. JonesKevin D. DewarMartin W. Sotheran
    • Anthony M. JonesKevin D. DewarMartin W. Sotheran
    • H04N1/41G06F17/14G06T1/20H04N7/30G06F7/38
    • G06F17/147
    • An IDCT method decimates a 2-D IDCT into two 1-D IDCT operations and then operates separately on the even and odd pixel input words. In a common processing step, selected input values are passed directly to output adders and subtractors, while others are multiplied by constant, scaled cosine values. In a pre-common processing step, the lowest-order odd input word is pre-multiplied by .sqroot. 2, and the odd input words are summed pairwise before processing in a common processing step. In a post-common processing step, intermediate values corresponding to the processed odd input words are multiplied by predetermined coefficients to form odd resultant values. After calculation of the even and odd resultant values, the high-order and low-order outputs are formed by simple subtraction/addition, respectively, of the odd resultant values from/with the even resultant values. The input values are preferably scaled upward by a factor of .sqroot. 2. Selected bits of some intermediate resulting data words are optionally adjusted by forcing these bits to either "1" or "0". The IDCT system includes a pre-common processing circuit (PREC), a common processing circuit (CBLK), and a post-common processing circuit (POSTC), which perform the necessary operations in the respective steps. The system also includes a controller (CNTL) to generate signals to control the loading of system latches and, preferably, to time-multiplex the application of the even and odd input words to latches in the pre-common circuit.
    • IDCT方法将2-D IDCT分解成两个1-D IDCT操作,然后分别对偶数和奇数像素输入字进行操作。 在通常的处理步骤中,所选择的输入值直接传递到输出加法器和减法器,而其他输入值乘以恒定的缩放余弦值。 在预共同处理步骤中,最低阶奇数输入字被预先乘以2ROOT + E,rad + EE 2,并且奇数输入字在公共处理步骤中处理之前成对相加。 在公知处理步骤中,将与处理的奇数输入字对应的中间值乘以预定系数,以形成奇数合成值。 在偶数和奇数结果值的计算之后,高次和低阶输出分别由奇偶结果值/偶数结果值的简单减法/加法形成。 输入值优选地按照2ROOT + E,rad + EE2的因子向上扩展。通过将这些位强制为“1”或“0”,可选地调整一些中间结果数据字的选定位。 IDCT系统包括在各步骤中执行必要操作的预共同处理电路(PREC),公共处理电路(CBLK)和后公共处理电路(POSTC)。 该系统还包括用于产生信号以控制系统锁存器的加载的控制器(CNTL),并且优选地将偶数和奇数输入字的应用时间复用到预共同电路中的锁存器。