Boots – shoes – and leggings
Patent
1978-08-24
1980-08-19
Hum, Vance Y.
Boots, shoes, and leggings
364861, G09B 2302
Patent
active
042177022
ABSTRACT:
An educational graphic display apparatus which, by use of electronic techniques displays graphically a function of a variable. The only programming necessary is the selection of the function type and the setting of coefficient values and a sequence of functions with different coefficient values can be displayed without the necessity of complex reprogramming for each new function. The apparatus of this invention utilizes at least one integrator responsive to a reset control signal and a forward/reverse signal, each of which signals has high and low logic levels, as well as a reset value signal and a voltage input signal. The integrator's output is the sum of (i) a constant, capable of being established by the reset value signal whenever the reset control signal is high, and (ii) a constant times the integral of the voltage input signal over time beginning immediately after the reset control signal has returned to a low logic level after being at a high logic level. In a preferred embodiment of the invention, a number of these integrators are placed in tandem, and limit sensors are provided to sense when signals representative of the display are outside the display limits of the system; the limit sensors are connected to cause appropriately modification of signals going to the integrators whenever an outside limit signal is detected.
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Hum Vance Y.
Nitkin William
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