In the invention, a coding controller takes a buffer occupancy at present from a transmission buffer, and first normalized value evaluating means outputs a first normalized value being independent of a video rate and a frame rate for the number of bits per n x QB and second normalized value evaluating means outputs a second normalized value for the number of bits per one frame. When the number of bits is relatively small, a second quantization characteristics control table is selected in a selector and the coding control every frame is performed. When the number of bits is large, a first quantization characteristics control table is selected in the selector and the control every n x QB is performed instead of the control every frame and the quantization characteristics control signal is outputted.
申请公布号
DE69017838(D1)
申请公布日期
1995.04.20
申请号
DE1990617838
申请日期
1990.10.31
申请人
MITSUBISHI DENKI K.K., TOKIO/TOKYO, JP
发明人
MURAKAMI, TOKUMICHI, C/O MITSUBISHI DENKI K. K., 1-1, OFUNA 5-CHOME KAMAKURA-SHI KANAGAWA, JP;MATSUZAKI, KAZUHIRO, C/O MITSUBISHI DENKI K. K, 1-1, OFUNA 5-CHOME KAMAKURA-SHI KANAGAWA, JP