Apparatus for two-dimensional inverse discrete cosine transform

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382250, G06F 1714

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active

056711697

ABSTRACT:
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.

REFERENCES:
patent: 5257213 (1993-10-01), Kim et al.
patent: 5343501 (1994-08-01), Kadono et al.
patent: 5483475 (1996-01-01), Kao
patent: 5528528 (1996-06-01), Bui

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