Data storage apparatus
First Claim
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1. A data storage apparatus comprising:
- sampling means for sampling data in a predetermined cycle storage means for storing a plurality of items of the data sampled by said sampling means;
updating means for updating the plurality of items of the data stored in said storage means to respective ones of the plurality of items of the data, which were sampled at later times than the plurality of items of the data were stored, in respective predetermined updating cycles which are shorter than the updating cycles of the plurality of items of the data which were sampled at respective earlier times; and
inhibiting means for inhibiting said updating means from updating the plurality of items of the data when a predetermined update inhibiting condition is satisfied.
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Abstract
A data storage apparatus includes a sampling device for sampling data in a predetermined cycle, and a storage device for storing a plurality of items of the data sampled by said sampling device. The data storage apparatus also includes an updating device for updating the plurality of items of the data stored in said storage device to respective ones of the plurality of items of the data, which were sampled at later times than the plurality of items of the data were stored, in respective predetermined updating cycles which are shorter than the updating cycles of the plurality of items of the data which were sampled at respective earlier times.
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Citations
12 Claims
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1. A data storage apparatus comprising:
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sampling means for sampling data in a predetermined cycle storage means for storing a plurality of items of the data sampled by said sampling means;
updating means for updating the plurality of items of the data stored in said storage means to respective ones of the plurality of items of the data, which were sampled at later times than the plurality of items of the data were stored, in respective predetermined updating cycles which are shorter than the updating cycles of the plurality of items of the data which were sampled at respective earlier times; and
inhibiting means for inhibiting said updating means from updating the plurality of items of the data when a predetermined update inhibiting condition is satisfied. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A data storage apparatus comprising:
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sampling means for sampling data in a predetermined cycle storage means for storing a plurality of items of the data sampled by said sampling means; and
updating means for updating the plurality of items of the data stored in said storage means to respective ones of the plurality of items of the data, which were sampled at later times than the plurality of items of the data were stored, in respective predetermined updating cycles which are shorter than the updating cycles of the plurality of items of the data which were sampled at respective earlier times, wherein the predetermined updating cycles are set to respective values each obtained by multiplying a predetermined value by 2n, where n is an integer equal to or larger than zero. - View Dependent Claims (8, 9)
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10. A data storage apparatus comprising:
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sampling means for sampling data in a predetermined cycle storage means for storing a plurality of items of the data sampled by said sampling means; and
updating means for updating the plurality of items of the data stored in said storage means to respective ones of the plurality of items of the data, which were sampled at later times than the plurality of items of the data were stored, in respective predetermined updating cycles which are shorter than the updating cycles of the plurality of items of the data which were sampled at respective earlier times, wherein said storage means comprises a plurality of storage areas for storing latest ones of the plurality of items of the data which are updated in an updating cycle identical to the predetermined cycle in which the data is sampled. - View Dependent Claims (11, 12)
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Specification