Discrete cosine transform circuit

Details Discrete cosine transform circuit Discrete cosine transform circuit

1993-12-30

1994-10-18

Mai, Tan V.

Boots, shoes, and leggings

G06F 15332

Patent

active

053574532

ABSTRACT:
A discrete cosine transform circuit including a shuffle circuit with n (n is an integer) shuffle stages, the n shuffle stages sequentially having 2.sup.n, 2.sup.n-1, . . . , 2.sup.1 input/output stages in such a manner that a first one of the n shuffle stages has the 2.sup.n input/output stages and a nth one of the n shuffle stages has the 2.sup.1 input/output stages, the nth shuffle stage including first and second RACs for performing a discrete cosine transform using a distributed arithmetic process, the first RAC having 2.sup.n-2 input/output stages, the second RAC having 2.sup.n-1 input/output stages. A path switching section is connected to the input stages of the shuffle circuit for changing a transfer path of output information from the output stages of the shuffle circuit according to whether the discrete cosine transform to be processed is a forward discrete cosine transform or an inverse discrete cosine transform. A first selection section is connected to the input stages of the first RAC and a second selection section is connected to the input stages of the second RAC. The first and second selection sections select information according to whether the discrete cosine transform to be processed is the forward discrete cosine transform or the inverse discrete cosine transform and apply the selected information to the first and second RACs, respectively.

REFERENCES:
patent: 4760543 (1988-07-01), Ligtenberg et al.
patent: 4791598 (1988-12-01), Liou et al.
patent: 4829465 (1989-05-01), Knauer et al.
patent: 5181183 (1993-01-01), Miyazaki
patent: 5249146 (1993-09-01), Uramoto et al.
patent: 5268853 (1993-12-01), Tanaka et al.
patent: 5285402 (1994-02-01), Keith

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