| 摘要 |
PURPOSE:To shorten the transmission time of a still picture in one picture frame by comparing overall code lengths of one picture frame generated in plural encoders and coding the still picture by the encoder in which a minimum overall code length is generated. CONSTITUTION:The overall code length obtained by using an encoder 4-1 for coding and that obtained by using an encoder 4-2 for coding are stored in registers 8-1 and 8-2 respectively. A comparator 9 compares respective overall code lengths and when the overall code length for the encoder 4-1 is shorter or equal to that for the encoder 4-2, a select signal generating circuit 10 outputs the 'high' level as a select signal (f) during one picture frame and a selector 5 selects an output (d) of the encoder 4-1. Meanwhile, when the overall code length for the encoder 4-2 is shorter, the select signal generating circuit 10 outputs the low level as the select signal (f) during one picture frame and the selector 5 selects an output (e) of the encoder 4-2. This output is subjected to variable length coding by a variable length encoder 6 and is multiplexed with a comparator output (k) by a multiplexing circuit 11. Thus, the transmission time is shortened.
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