| 摘要 |
An apparatus for real time 2-D IDCT comprises a rate buffer, a pair of multiplexers, a plurality of registers, a plurality of parameter extractors, a plurality of accumulators, a plurality of summing elements, a pair of truncators, a transpose buffer and an inverse rate buffer. In the present invention, data input rate of the rate buffer and output rate of the inverse rate buffer are a first rate, while the transform process, which is carried out between the rate buffer and the inverse rate buffer, is at a second rate. Moreover, a distributed arithmetic structure is utilized in the invention to decrease the circuit complexity and increase the operating efficiency. Therefore, real time 2-D IDCT can be achieved by the apparatus of the present invention.
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