Discrete cosine transformer and inverse discrete cosine transfor

Details Discrete cosine transformer and inverse discrete cosine transfor Discrete cosine transformer and inverse discrete cosine transfor

1997-08-05

1999-01-26

Malzahn, David H.

Boots, shoes, and leggings

G06F 1714

Patent

active

058644946

ABSTRACT:
A discrete cosine transformer capable of real time processing without a multiplier having small circuit scale and small power consumption includes an adder/subtractor receiving a plurality of image data items for outputting a plurality of image data item addition/subtraction values in accordance with a prescribed rule, a bit distributor connected to the adder/subtractor, receiving the plurality of image data item addition/subtraction values for outputting a plurality of bit trains consisting of bits at same bit position of the plurality of image data item addition/subtraction values, a selection signal generating circuit for successively generating a selection signal of a DCT coefficient, and a DCT coefficient generating circuit connected to the bit distributor and to the selection signal generating circuit, receiving a plurality of bit trains and responsive to the successively generated selection signal, for performing calculation of the DCT coefficient in time-divisional manner.

REFERENCES:
patent: 5331584 (1994-07-01), Kitsuki et al.
patent: 5357453 (1994-10-01), Kim et al.
patent: 5471412 (1995-11-01), Shyu
patent: 5477469 (1995-12-01), Motomura
"A New Hardware Realization of Digital Filters", Peled et al, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-22, No. 6, pp. 456-462.
"A 100-Mhz 2-D Discrete Cosine Transfor Core Processor", Uramoto et al., IEEE Journal of Solid-State Circuits, vol. 27, No. 4, Apr. 1992, pp. 492-499.

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