H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/12 (2006.01) H04N 7/08 (2006.01) H04N 7/081 (2006.01) H04N 7/32 (2006.01) H04N 7/50 (2006.01)
Patent
CA 2061564
Time-varying picture signals of a plurality of channels are predictively coded by utilizing the interframe correlation, and are multiplexed at the transmitting side. After transmission the signals are separated at the receiving side for each channel, and a channel is selected and switched for decoding. When the receivingchannel is switched over to another channel, a decoding error can occur and a reproduced screen can collapse since the predicting signals do not coincide witheach other at the transmitting and receiving sides. Therefore, when the plurality of channels is selectively switched for decoding by using a single decoder, the refresh is repeated at predetermined time intervals in a short period of time by utilizing the intraframe correlation when the coding is carried out at the transmitting side. Thus, even if the channel is switched, an excellent reproduced screen may be immediately obtained. However, during the refresh, the compression ratio is reduced comparedwith that of the bit rate when a normal interframe correlation is carried out. Therefore, when the refresh is carried out, the amount of transmitted information for part or all of the channels other than the refreshed channel is compressed and, conversely, the amount of transmitted information for the refreshed channel is increased by the compressed amount and allocated. Thus, even if the channel is switched at the receiving side, the decoded image for the newly-selected channelcan be promptly reproduced.
Koga Toshio
Ohki Jun'ichi
Corporation Nec
G. Ronald Bell & Associates
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