Method of and arrangement for producing numerical values proportional to the frequency of measured pulses of a measured pulse train
First Claim
1. A method of producing final numerical values which are proportional to the frequency of measured pulses of a measured-pulse train, comprising the steps of:
- detecting the number of periods of said measured pulses occurring during each of a succession of reference time intervals of a constant length;
calculating from said detected number a coarse approximation numerical value; and
supplementing said coarse approximation numerical value by a correction numerical value to obtain said final numerical value, includingmeasuring during each of said reference time intervals the time duration elapsed from the beginning of said reference time interval to the occurrence of the last one of said measured pulses in the respective one of said reference time intervals,deriving from the difference between said time durations measured during successive ones of said reference time intervals an address of a memory table location,addressing the respective one of said memory table locations with said derived address to thereby retrieve the contents thereof, said contents being proportional to the reciprocal value of the sum of said constant length of said reference time intervals and said difference, andcombining said retrieved contents of said addressed memory table location with said coarse approximation numerical value.
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Abstract
A method and a device for the generation of numerical values which are proportional to the frequency of the measured pulses of a measured-pulse train are proposed which make available the numerical values covering a wide measuring range with high precision and in a shortest possible time. To this end, in invariably predetermined reference time intervals, the number of the periods of the measured pulses is in each case measured as an approximate value for the frequency, and a correction value is added to the approximate value. The correction values are contained in at least one table as table values under respective addresses, the table values being derived from the difference between the time durations measured in successive reference time intervals up to the respective last measured pulse in the reference time interval. The table values are proportional to the reciprocal value of the total of the reference time interval and the difference between the time durations measured in the successive reference time intervals up to the respective last pulse in the interval.
22 Citations
23 Claims
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1. A method of producing final numerical values which are proportional to the frequency of measured pulses of a measured-pulse train, comprising the steps of:
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detecting the number of periods of said measured pulses occurring during each of a succession of reference time intervals of a constant length; calculating from said detected number a coarse approximation numerical value; and supplementing said coarse approximation numerical value by a correction numerical value to obtain said final numerical value, including measuring during each of said reference time intervals the time duration elapsed from the beginning of said reference time interval to the occurrence of the last one of said measured pulses in the respective one of said reference time intervals, deriving from the difference between said time durations measured during successive ones of said reference time intervals an address of a memory table location, addressing the respective one of said memory table locations with said derived address to thereby retrieve the contents thereof, said contents being proportional to the reciprocal value of the sum of said constant length of said reference time intervals and said difference, and combining said retrieved contents of said addressed memory table location with said coarse approximation numerical value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An arrangement for producing final numerical values which are proportional to the frequency of measured pulses of a measured-pulse train, comprising:
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means for detecting the number of periods of said measured pulses occurring during each one of a succession of reference time intervals and the time duration elapsed during each of said reference time intervals up to the occurrence of the last one of said measured pulses during the respective one of said reference time intervals; and means for calculating from said detected number a coarse approximation numerical value and calculating from said detected durations a correction numerical value, and from said coarse approximation and said correction numerical values calculating said final numerical value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification