Method and apparatus for generating a stroke on a display
First Claim
Patent Images
1. An apparatus for generating a stroke having an X and a Y component on a display comprising:
- means for providing a first pulse train having a first pulse rate;
means for providing a second pulse train having a second pulse rate; and
means responsive to said first and said second pulse trains for providing a first and a second output corresponding to said X and said Y components, respectively, each of whose rate of change is linearly related to a different one of said first and said second pulse rates.
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Abstract
A method and apparatus for generating a stroke on a display comprising a pair of pulse train generators coupled to a pair of charge pump and integrator assemblies by means of a switch assembly. In operation, a first pulse train corresponding to the larger of the X and Y components of the stroke and a second pulse train corresponding to the ratio of the X and Y components of the stroke control the magnitude of the output of the charge pump and integrator assemblies.
34 Citations
23 Claims
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1. An apparatus for generating a stroke having an X and a Y component on a display comprising:
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means for providing a first pulse train having a first pulse rate; means for providing a second pulse train having a second pulse rate; and means responsive to said first and said second pulse trains for providing a first and a second output corresponding to said X and said Y components, respectively, each of whose rate of change is linearly related to a different one of said first and said second pulse rates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of generating a stroke having X and Y components on a display comprising the steps of:
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providing a first and a second pulse train having a first and a second pulse rate, respectively; selectively generating and transferring a charge for each pulse in one of said first and said second pulse trains to a first analog signal generating means in response to a first control signal and from said first analog signal generating means in response to a second control signal for providing an analog signal at the output of said first analog signal generating means having a magnitude which varies linearly as a function of said pulse rate in said one pulse train; and selectively generating and transferring a charge for each pulse in the other of said first and said second pulse trains to a second analog signal generating means in response to a third control signal and from said second analog signal generating means in response to a fourth control signal for providing an analog signal at the output of said second analog signal generating means having a magnitude which varies linearly as a function of the pulse rate in said other pulse train. - View Dependent Claims (16, 17)
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18. An apparatus for generating a stroke between two pairs of coordinates X1, Y1 and X2, Y2 on a display comprising:
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a first means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing an X analog output signal having a magnitude which increases at a first rate when |Δ
X|>
|Δ
Y| and Δ
X>
0;a second means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing an X analog output signal having a magnitude which increases at a second rate, when |Δ
X|<
|Δ
Y| and Δ
X>
0;a third means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing an X analog output signal having a magnitude which decreases at said first rate when |Δ
X|>
|Δ
Y| and Δ
X<
0;a fourth means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing an X analog output signal having a magnitude which decreases at said second rate when |Δ
X|<
|Δ
Y| and Δ
X<
0;a fifth means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing a Y analog output signal having a magnitude which increases at a third rate, when |Δ
X|<
|Δ
Y| and Δ
Y>
0;a sixth means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing a Y analog output signal having a magnitude which increases at a fourth rate, when |Δ
X|>
|Δ
Y| and Δ
Y>
0;a seventh means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing a Y analog output signal having a magnitude which decreases at said third rate when |Δ
X|<
|Δ
Y| and Y=;an eighth means responsive to a plurality of signals proportional to the magnitude and polarity of Δ
X and Δ
Y for providing a Y analog output signal having a magnitude which decreases at said fourth rate when |Δ
X|<
|Δ
Y| and Y<
0, where Δ
X=X2-X1, Δ
Y=Y2-Y1 and |X| and |Y| are the absolute values of Δ
X and Δ
Y, respectively. - View Dependent Claims (19, 20, 21)
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22. An apparatus for generating a stroke having an X and a Y component on a display comprising:
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means for integrating a charge; means responsive to each pulse in a pulse train for providing a train of corresponding pulses having a pulse rate and a predetermined period; and means responsive to a first and a second control signal and said corresponding pulses for selectively applying a first and a second predetermined potential to said charge integrating means for said predetermined period for each one of said pulses for changing said charge at a rate which is linearly related to said pulse rate. - View Dependent Claims (23)
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Specification