Circuit for computing the quantized coefficient discrete cosine

Details Circuit for computing the quantized coefficient discrete cosine Circuit for computing the quantized coefficient discrete cosine

1987-12-11

1989-07-18

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

048499226

ABSTRACT:
The circuit consists of two parallel branches which perform multiplication and accumulation operations for the even and odd lines of the transform coefficient matrix. Each branch includes: an input circuit (SEM1, SOT1) whereby the contributions of the opposing index columns of the matrix may be added; a multiplication circuit (ERM, ORM) which performs multiplication operations for each matrix column by an addition and shifting operation for each matrix coefficient; and an accumulation circuit for the intermediate products of each matrix column.

REFERENCES:
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patent: 4293920 (1981-10-01), Merola
patent: 4385363 (1983-05-01), Widergren et al.
patent: 4449194 (1984-05-01), Wilhelm
patent: 4675836 (1987-06-01), Arnould et al.
patent: 4679163 (1987-07-01), Arnould et al.
Haralick, "A Storage Efficient Way to Implement the Discrete Cosine Transform", IEEE Trans. on Comp., Jul. 1976, pp. 764-765.
Hague, "A Two-Dimensional Fast Cosine Transform", IEEE Trans. on Acoustics, Speech, and Signal Processing, vol. ASSP-33, No. 6, 12/85, pp. 1532-1539.
Kamanger et al., "Fast Algorithms for the 2-D Discrete Cosine Transform", IEEE Trans. on Computers, vol. C-31, No. 9, Sep. 1982, pp. 899-906.

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