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Apparatus for simultaneously measuring a plurality of digital events employing a random number table
Apparatus for simultaneously measuring a plurality of digital events employing a random number table
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机译：使用随机数表同时测量多个数字事件的设备
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摘要
Apparatus for measuring the rate of occurrence and duration of digital events through the technique of multiple sampling at times random to the occurrence of the digital events. The digital events to be sampled are represented as the presence or absence of binary ones or zeroes that can be sensed in a subject conductor at a given point in time. Since the probability of sensing a binary state of true or false at any particular but randomly determined time is a function of the duty cycle, sensing the binary state of or sampling a given digital event a given number of times produces a correspondingly statistically significant measure of the duty cycle of the digital event. The greater the number of samples, the greater the confidence in the measure of the duty cycle. The number of samples necessary to evoke a given confidence level is determined through the use of basic statistics. The point in time at which sampling occurs must be random to permit statistical validity. Though true randomness may be philosophically unattainable, randomness for sampling purposes is achieved through reading a random number table stored within a programmable read only memory (PROM) in response to a time standard running synchronously to the occurrence of the digital events to be sampled. Each entry from the random number table determines whether sampling will occur when it is read from the PROM. The binary state of each subject conductor is recorded at the sampling time as an increment to a counter or increment to the contents of an addressable location in a random access memory (RAM).
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