Timing mode selector
First Claim
1. Timing mode selector comprising in combinationa clock pulse generator for supplying a continuous series of timing pulses,a first pair of integrated-circuit counters,said counters being connected in series to the output of said generator for providing a predetermined first mode pulse rate output,a second pair of integrated-circuit counters,said second counters being connected in series to said first mode output for providing a predetermined second mode pulse rate output,a unitary integrated circuit for alternatively selecting said first or second mode output comprising four NAND gates, each of said NAND gates having two input circuits and an output,means for connecting a mode-control signal to said unitary integrated circuit,said mode-control signal having an on-state for one of said modes and an off-state for the other of said modes,an output circuit from said unitary integrated circuit for transmitting the selected one of said modes,first circuit means for connecting said first and second mode pulse rate outputs to the inputs of two of said NAND gates,second circuit means for connecting said mode-control signal connecting means to two other inputs of said NAND gates, andthird circuit means for connecting said output circuit to one of said NAND gate outputs.
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Abstract
An electrical system for selecting one of two modes, or signal pulse rates. It employs electronic elements to divide a source of clock pulses into two different pulse rates. The system also employs integrated circuits for counting the clock pulses, and a plurality of NAND gates connected so as to pass the selected one of the counting rates, or modes. The NAND gates are controlled by an on-off signal input.
14 Citations
1 Claim
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1. Timing mode selector comprising in combination
a clock pulse generator for supplying a continuous series of timing pulses, a first pair of integrated-circuit counters, said counters being connected in series to the output of said generator for providing a predetermined first mode pulse rate output, a second pair of integrated-circuit counters, said second counters being connected in series to said first mode output for providing a predetermined second mode pulse rate output, a unitary integrated circuit for alternatively selecting said first or second mode output comprising four NAND gates, each of said NAND gates having two input circuits and an output, means for connecting a mode-control signal to said unitary integrated circuit, said mode-control signal having an on-state for one of said modes and an off-state for the other of said modes, an output circuit from said unitary integrated circuit for transmitting the selected one of said modes, first circuit means for connecting said first and second mode pulse rate outputs to the inputs of two of said NAND gates, second circuit means for connecting said mode-control signal connecting means to two other inputs of said NAND gates, and third circuit means for connecting said output circuit to one of said NAND gate outputs.
Specification
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- Resources
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Current AssigneeTexaco Incorporated (Chevron Corp.)
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Original AssigneeTexaco Incorporated (Chevron Corp.)
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InventorsFlournoy, Norman Eustace
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Primary Examiner(s)James, Andrew J.
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Assistant Examiner(s)Clawson, Jr., Joseph E.
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Application NumberUS05/309,392Time in Patent Office1,341 DaysField of Search307/233, 307/225, 307/225 R, 307/233 R, 328/46US Class Current377/47CPC Class CodesG01M 3/005 using pigs or moles G01M3/2...G01M 3/24 using infrasonic, sonic, or...G04G 3/022 the desired number of pulse...H03K 3/64 Generators producing trains...
