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    • 2. 发明授权
    • Two-dimensional inverse discrete cosine transform apparatus
    • 二维逆离散余弦变换装置
    • US5835391A
    • 1998-11-10
    • US805050
    • 1997-02-24
    • Seongrai Cho
    • Seongrai Cho
    • G06F7/548G06F17/14H03M7/30H04N19/42H04N19/423H04N19/44H04N19/46H04N19/60H04N19/625H04N19/70H04N19/85
    • G06F17/147H04N19/42H04N19/61H04N19/60
    • A two-dimensional inverse discrete cosine transform (IDCT) apparatus which has a storage section for storing inverse-quantized data having a first bit-length and IDCT-transformed data having a second bit-length in allocated storage locations having the second bit-length. An IDCT processing section is provided for receiving the data stored in the storage section in a unit of a pixel, sign-extending the data having the first bit-length to the second bit-length, and then IDCT-transforming sign-extended data to produce the IDCT-transformed data having the second bit-length. An IDCT control section is provided for receiving and storing in the storage section the inverse-quantized data having the first bit-length in a unit of a packet, reading out data stored in the storage section according to a first order, and transferring read-out data to the IDCT processing section for a one-dimensional IDCT in a first direction. The IDCT control section is also provided for rewriting in the storage section first IDCT-transformed data according to a second order, reading out rewritten data, and transferring read-out data to the IDCT processing section in a second direction. The IDCT control section is also for rewriting in the storage section second IDCT-transformed data to complete two-dimensional IDCT, and reading out by a third bit-length from the storage section two-dimensional IDCT-transformed data having the second bit-length.
    • 一种二维逆离散余弦变换(IDCT)装置,具有存储部分,用于存储具有第二比特长度的第一比特长度和IDCT变换的数据的逆量化数据,该数据具有第二比特长度 。 提供IDCT处理部分,用于以像素为单位接收存储在存储部分中的数据,将具有第一位长度的数据签名扩展到第二位长度,然后将符号扩展数据IDCT变换为 产生具有第二位长的IDCT变换的数据。 提供IDCT控制部分,用于在存储部分中接收并存储具有分组单元的第一位长度的逆量化数据,根据第一顺序读出存储在存储部分中的数据, 将数据输出到IDCT处理部分以用于在第一方向上的一维IDCT。 还提供IDCT控制部分,用于根据第二顺序在存储部分中重写第一IDCT变换的数据,读出重写的数据,并将读出的数据以第二方向传送到IDCT处理部分。 IDCT控制部分还用于在存储部分中重写第二IDCT变换的数据以完成二维IDCT,并且从存储部分读出具有第二位长度的二维IDCT变换数据的第三位长度 。