| 摘要 |
A method and apparatus for sensing the polarity of an input pulse train signal and for automatically changing its polarity as required by the circuit to which it will be applied, is disclosed. The polarity of the input pulse train signal is determined by an averaging network that detects the average DC level of the signal. The averaged signal is compared with one representing the desired output signal polarity to provide a control signal which is used to determine whether the input signal is of the proper polarity to form the output signal or whether it must first be inverted. The phase and timing parameters of the output pulse train signal match those of the input signal. |
