Speed measuring device
First Claim
Patent Images
1. A speed measurement device for calculating and displaying the average speed of an object moving a distance between first and second location, the device comprising:
- means for generating a first time base;
means for accumulating time interval information based on said first time base and occurring between a first event corresponding to said first location and a second event corresponding to said second location;
means for supplying information corresponding to said distance between the two locations in appropriate units for calculation;
means for calculating speed by dividing said distance information by said time interval information;
means for displaying said calculated speed of said moving object;
means for generating a second time base;
means for comparing said first and second time bases for determining the existence of a predetermined relationship between them; and
means for controlling the display means in accordance with said predetermined relationship.
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Abstract
A special accessory for traffic radar devices includes two operating routines. These routines are to be used with a programmable microprocessor which comprises a portion of the traffic radar device. The routines are designated as a stopwatch routine and an interrupt routine. The stopwatch routine controls the overall operation of the speed computation within the programmable microprocessor of the traffic radar device while the interrupt request routine causes the microprocessor to perform as a precision clock capable of measuring elapsed time.
34 Citations
19 Claims
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1. A speed measurement device for calculating and displaying the average speed of an object moving a distance between first and second location, the device comprising:
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means for generating a first time base; means for accumulating time interval information based on said first time base and occurring between a first event corresponding to said first location and a second event corresponding to said second location; means for supplying information corresponding to said distance between the two locations in appropriate units for calculation; means for calculating speed by dividing said distance information by said time interval information; means for displaying said calculated speed of said moving object; means for generating a second time base; means for comparing said first and second time bases for determining the existence of a predetermined relationship between them; and means for controlling the display means in accordance with said predetermined relationship. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a doppler radar device capable of determining the speed of a moving vehicle, the combination therewith of:
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means for manually entering distance information of a distance measurement; timing means for measuring elasped time between events to thereby provide a time measurement; switch means having a normal condition and an increment condition, said switch means being normally biased toward said normal condition and operable to be manually moved from said normal condition to said increment condition; counting means for recording the number of times said switch means is manually moved from said normal condition to said increment condition, said counting means being incremented by a prescribed amount each time said switch means is manually moved from said normal condition to said increment condition; means for effectuating activation of said timing means whenever said counting means obtains a count state representative of one incremental increase; means for causing deactivation of said timing means whenever said counting means obtains a count state representative of two incremental increases; means for converting said distance and time measurements into a speed measurement upon deactivation of said timing means; and means for displaying said speed measurement; timing calibration check circuit connected to said converting means for controlling the display of said speed measurement in said display means in response to said timing calibration check circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. The method for calculating and displaying the average speed of an object moving between a first and a second location, the method comprising the steps of:
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generating a first time base; accumulating a time interval based on said first time base and occurring between a first event corresponding to said first location and a second event corresponding to said second location; determining the distance between said two locations in appropriate units for calculation; calculating speed by dividing said distance by said time interval; generating a second time base; comparing said first and second time bases to determine if a predetermined relationship exists between them, and displaying said calculated speed if said predetermined relationship between said first and second time bases exists. - View Dependent Claims (16, 17, 18, 19)
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Specification