| 摘要 |
PURPOSE:To avoid rapid stop of subscanning and to prevent uneven transmission and generation of noise, by controlling the subscanning speed according to not only the number of stored bits of a buffer memory, but also the storage state of a line memory. CONSTITUTION:A picture signal for one line's share read at a reading section is stored in the line memory 2 having (n+1) lines once. The picture signal stored in the line memory 2 is encoded at an encoding section 3 and stored in the buffer memory 4, then transmitted to a modulating section 5 sequentially and to a line. The number of stored bits in the buffer memory 4 and the number of storage lines of the line memory 2 are detected at detecting sections 7, 6, every time the reading of one line is finished, both the detected outputs are applied to a subscanning speed controlling section 8 to select the scanning speed, allowing to change the N kinds of the subscanning speeds determined in advance one by one step. |
