| 摘要 |
PURPOSE:To reduce the transmission time, by storing mode information to which each state belongs at both transmission and receiving sides, using a code suitable for each mode, encoding the estimated order and attaining the encoder in response to the property of the information source. CONSTITUTION:An estimating conversion table is stored in an estimating converter 41 at the transmission side, a contrast level signal of a noted picture element X is converted into an estimated order C in response to a density pattern of picture signals A, B outputted from a picture element memory 43 and applied to a switching device 44. Further, a signal M represented with the order C is generated from a mode signal generator 42 in response to the density pattern of the signals A, B, and the signal M is applied to a switching device 44, an S mode encoder 45, a W mode encoder 46, and a transmission code word selector 47. Further, the code suitable for each mode is used, the order C is coded, and applied to an S mode decoder 52 and a W mode decoder 53 from a transmission line 100 at the receiving side and the signal is decoded in response to the property of the signal source. |
