Abstract:
As prime equipment, such as radio, radar, sonar, computer and control equipment becomes more complex, the probability of failure increases. This disclosure is directed to a system for rapidly monitoring the quality of the signal at numerous test points throughout the equipment. In the interest of reliability, each signal parameter at each test point is converted to a pulse the duration of which is a measure of the parameter. These pulses are each transmitted to a centrally located general purpose computer where each is measured by a high frequency oscillator, gate, and counter.
Abstract:
In a feedback circuit, the time at which a slicing circuit samples a received data signal is controlled to minimize the error rate in the digitized output signal. A parity check circuit controls a bistable multivibrator to provide a signal which repetitively varies the sampling time over a narrow range. The output of the bistable multivibrator is integrated to provide a signal which controls the sampling time over a wider range.