Orthogonal transform processor

Details Orthogonal transform processor Orthogonal transform processor

1995-05-03

1997-01-21

Envall, Jr., Roy N.

Boots, shoes, and leggings

G06F 1714

Patent

active

055965180

ABSTRACT:
Stored in each of four coefficient memories are eight elements of each row of a matrix in 4 rows and 8 columns, which matrix consists of absolute values of elements of upper four rows out of an inverse discrete cosine matrix in 8 rows and 8 columns to be subjected to an 8-point IDCT processing. An input element y.sub.ij is supplied in parallel to four multipliers. Each of the four multipliers executes multiplication of an output of the corresponding coefficient memory out of the four coefficient memories, by the input element y.sub.ij. Eight accumulators are disposed for executing, in parallel, accumulation for obtaining eight inner products using results of the four multipliers while restoring signs of the coefficients of the orthogonal transform matrix. An 8-input selector is disposed for successively selecting results of the eight accumulators to supply an inner product w.sub.ij corresponding to the input element y.sub.ij.

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patent: 5291429 (1994-03-01), Iwama et al.
patent: 5331585 (1994-07-01), Tanaka et al.
patent: 5477478 (1995-12-01), Okamoto et al.
patent: 5528528 (1996-06-01), Bui

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