| 摘要 |
PURPOSE:To improve the quality of encoding picture by deciding a switching control signal of quantizing characteristic intended to decrease generation of information through using stored quantity of a buffer memory and a control signal before 1 frame time. CONSTITUTION:The value of an picture element of a frame delay circuit 10 is subtracted from a digital television signal input from a signal input terminal 8 and an estimated error signal between frames is obtained. A quantizing circuit 11 quantizes this estimated error signal and outputs with the use of a buffer memory 13 by smoothing. A unatizing characteristic setting circuit 15 sets a quantizing characteristic signal by the stored quantity of the buffer memory 13 and a quantizing characteristic control signal of 1 frame time which is the output of a frame delay circuit 16. Then, the characteristic of the quantizing circuit 11 is decided. When stored quantity of the buffer memory 13 is large, the quantizing characteristic is made rough and when it is small, the characteristic is made fine. |
