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US 5,327,107 AGranted
Electrical apparatus with digitally set transfer function
AssigneeGEC-Marconi Limited
InventorBrian J. Buck
Life of this patent
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Abstract
An electrical apparatus has a number of units (1 to 6), each of which is capable of presenting a transfer function of a different value to an input signal. It also includes control circuitry (7, 9) whereby a desired selection of units (1 to 6) can be made so as to present to the input signal a total value of desired transfer function. The values of the units are chosen such that the ratio (B) between a function value and the next smaller value is less than 2:1.
Claims6
An electrical apparatus comprising:
- a number of units, each of which, when selected, presents to an input signal a transfer function of a different fixed value;
- and control means for making a selection of said units so as to present to the input signal a desired total transfer function value within a predetermined range, the ratio between each transfer function value and the next smaller transfer function value being less than 2:1.
Dependencies are inferred from the claim text.