| 摘要 |
PURPOSE:To improve endurable strength characteristics to an instantaneous break, by adding a training detecting circuit and minimizing data which is made insignificant owing to the instantaneous break. CONSTITUTION:A signal inputted through a communication line is inputted to a waveform shaping filter ROF to remove noise components, etc. The signal passed through the ROF is delayed by a delay element TA, by one signal element and added by an adding circuit + to the undelayed signal, thereby obtaining a signal A+B. Then, the signal A+B is delayed by a delay element TB by 180 deg. to perform complex conjugation, and then multiplied by a vector component A+B through a multiplexer X to change the vector component A+B from an imarinary number to a real number. This output result is inputted to a sign deciding circuit CJU from respective taps of delay elements TC-TG with taps. The CJU judges that the received signal is a training signal when the output results from the delay elements have polarities +++++- or data when +-++-- at random. Thus, whether the received signal is data or the training signal is detected easily. |
