Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Patent
1998-02-11
1999-11-09
Ngo, Chuong Dinh
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
G06F 700
Patent
active
059832509
ABSTRACT:
There is disclosed a compact arithmetic circuit for obtaining an absolute-valued distance (AVD) between two digital data. An inverter 11 generates the data * .beta. which is derived from the data .beta. as the 1's complement thereof. An ALU 12 adds the data .alpha. and the data * .beta. when a carry data C1 is inputted thereto. An inverter 13 generates a new carry data C2 from the add result of the ALU 12 and feeds it back to the ALU 12. Each bit of the add result by the ALU 12 is inverted by an inverter 15 and is given to a selector 14. After the initial add operation, the ALU 12 adds the data .alpha. and the data * .beta. by using carry data C2 as the input thereto. A selector 14 selects either the first add result by the ALU 12, the output data from the inverter 15 corresponding to the first add result, the second add result by the ALU 12, or the output data of the inverter 15 corresponding to the second add result, and outputs the selected as a correct AVD.
REFERENCES:
patent: 4953115 (1990-08-01), Kanoh
patent: 5216628 (1993-06-01), Mizutani et al.
patent: 5563813 (1996-10-01), Chen et al.
Ngo Chuong Dinh
OKI Electric Industry Co., Ltd.
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