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US 4,363,025 AGranted
Signal generating arrangements
AssigneeElliott Brothers (London) Limited
InventorHoward Jackson
Life of this patent
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Abstract
A digitally controlled, presettable, ramp signal generating arrangement comprising digital to analogue converter means (DA) and integrator means (A1, A2) having a first mode in which its output (0) assumes a value representative of the output of the converter means, and a second mode in which its output changes at a rate dependent on the output of the converter means. The arrangement finds especial application in symbol display arrangements.
Claims5
A digitally controlled presettable analogue ramp signal generating arrangement comprising:
- (A) digital to analogue converting means;
- (B) integrator means consisting of
- (i) a first stage which operates as an amplifier,
- (ii) a second stage which operates as an integrator, and
- (iii) switching means which,
- (a) when the arrangement is in a first mode, interconnects said converter and said first and second stages so that the output of the converter means is applied to said second stage via said first stage, the first stage operates as a scaling amplifier and the output of the integrator means assumes a value representative of the output of the converter means, and
- (b) when the arrangement is in a second mode, interconnects said converter means and said second stage and disconnects said first stage so that the output of the converter means is applied directly to said second stage and the output of the integrator means changes at a rate dependent on the output of the converter means;
- and
- (C) analogue sample and hold means which periodically samples and holds the output of the arrangement and controls the output of the converting means to reduce towards zero any deviation in the output of the arrangement from its desired value at the time of sampling.
6 more elements
Dependencies are inferred from the claim text.