| 摘要 |
PURPOSE:To perform surely white line skip without malfunction, by transmitting a skip signal in the same form as a message signal and detecting the skip signal with demodulation at the receiving side. CONSTITUTION:A skip line is transmitted in the period of T0/3(s), where T0 is one line period. Although a synchronizing signal of white data enters a t0 period at the head of the line during message transmission, whether the line is skip line or not is discriminated depending on the presence or absence of a skip flag F next to the synchronizing signal. That is, as shown in Fig. (b), F=1 is given to the 1st and the 3rd line data, and F=0 is given to the 2nd line data. Then, the receiving side recognizes that the 2nd line data is the skip line by monitoring the tF period at the receiving side. Further, the transmission wave is as shown in (c), and only the carrier of the synchronizing signal remains, and the carrier is transmitted in the black data consecutive for gamma0 period while being suppressed. The td period shows the delay component of a demodulator, and when a signal of this waveform enters the demodulator, a demodulation signal is obtained after td. |
