| 摘要 |
PROBLEM TO BE SOLVED: To suppress influences caused by data omission a little by appropriately selecting a carrier to transmit a retransmission packet when transmitting data while dividing the data into a plurality of carriers.SOLUTION: A video transmission/reception system 100 comprises a transmission facility 1 and a reception facility 2. In the transmission facility 1, a first carrier and a second carrier of different line qualities are modulated and transmitted to a repeater 3 in accordance with importance of video packets resulting from dividing a video encoded signal which is obtained by encoding a video signal. In the reception facility 2, the modulated signal is received and demodulated and the demodulated video packets are combined to produce the video encoded signal. In the reception facility 2, an error packet is detected from the synthetic video encoded signal, and a retransmission request signal including retransmission request packet information is generated and transmitted to the repeater 3. The transmission facility 1 receives the retransmission request signal and regarding a retransmission packet designated by the retransmission request packet information, in the case where immediate utilization of a perfect video encoded signal is required, it is determined that the importance is high. Then, the first carrier of higher line quality is modulated and transmitted to the repeater 3. |
