Apparatus and method for comparing data groups

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3649272, 36492761, 36492763, 364934, 364941, 3649415, 364943, 36494344, 3649435, 364947, 3649471, 3649472, 364955, 3649556, 364957, 3649571, 3649573, 364960, 3649601, 364962, 3649624, 364DIG2, 395340, 395602, 395619, 395761, G06F 1500, G06F 1721

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active

RE0358614

ABSTRACT:
Method and apparatus for comparing original and modified versions of a document. The system of the present invention utilizes a hash number generator CPU to generate hash numbers for lines and sentences contained in the documents. Matching hash numbers are defined as anchorpoints and stored in an anchorpoint memory. A comparator CPU performs a character-by-character comparison of the respective documents radiating outward from each anchorpoint. This comparison generates identity blocks which are defined as blocks which are the same in both documents. Non-identity blocks are defined as difference blocks and are characterized as insertions or deletions depending on their status. A portion of the original and modified document is displayed in a split-screen format on a display, such as a CRT. Cursors on the top and bottom half of the screen identify corresponding portions of the documents. The second cursor is generated by taking advantage of the timer interrupt sequence of a CPU to direct the CPU to program instructions to generate the second cursor.

REFERENCES:
patent: 4204206 (1980-05-01), Bakula et al.
patent: 4212077 (1980-07-01), Vittorelli
patent: 4531201 (1985-07-01), Skinner, Jr.
patent: 4641274 (1987-02-01), Swank
patent: 4701745 (1987-10-01), Waterworth
patent: 5265065 (1993-11-01), Turtle
Heckel, "A technique for Isolating Differences Between Files", Apr. 1978, pp. 264-268.
Paul Heckel; "A Technique For Isolating Difference Between Files"; Apr. 1978, p. 265.

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