| 摘要 |
PURPOSE:To ensure the reception of the succeeding burst from the head devising the system such that demodulation is applied continuously when a 3rd pattern different from a 1st pattern is detected after a 2nd pattern at the reception side and the initial mode of demodulation is transited when the 3rd pattern is not detected. CONSTITUTION:A new voice signal is inputted while a transmission station sends an end of burst(EOB) and a voice detector outputs a detection signal. The transmission station starts sending the next burst corresponding to the new voice signal from a frame next to the frame in which the transmission the EOB of the preceding burst is finished. In this case, each bit of a framing bit F is replaced by a inversion of F being the inverted pattern. On the other hand, the reception station detects the EOB to continue the fixing of the synchronization of a demodulator to await the bit inversion F at the head of the initial frame after the detection of EOB. When the inversion F is detected, the fixing of the synchronization of the detector is continued further to receive the succeeding burst. When no inverted F is detected, the synchronization fixing of the demodulator is opened and the mode is transited to the initial mode awaiting the succeeding burst. |
