ERROR RATE MEASURING SYSTEM

摘要

PURPOSE:To simplify the system constitution by extracting each synchronizing pulse of plural channels and allowing majority decision of frame synchronizing pulses extracted in this way to detect an error pulse thereby counting the error pulse and measure the error rate. CONSTITUTION:A demodulation circuit 1 of the system demodulates a reception modulation signal and a data of channels CH1-CHn corresponding to the modulation system is inputted to a sampling circuit 2. Moreover, a clock CK is frequency-divided by a frequency-division circuit 4, adds the result to the circuit 2 as the frame synchronizing sampling signal, the data of the channels CH1-CHn is sampled and its sampling output is fed to a correlation circuit 3 and an error extracting circuit 5. The correlation of the channels CH1-CHn is obtained to control the frequency dividing ratio of the circuit 4 thereby maximizing the correlation value at each frame period. Then the extraction circuit 5 uses the majority decision of frame synchronizing pulses so as to extract the error pulse, the error count circuit 6 obtains the error rate to simplify the system constitution.