VIDEO DATA TRANSMITTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide the method which can transmit digital video segments over transmission channels while varying the transmission rate during the transmission. SOLUTION: For the respective transmission channels, the video data segments accompanied by write control blocks(WCB) are stored in a data buffer 40. Each WCB includes a pointer indicating its relative video data segment and a code indicating a preferable data transmission rate. The address of the WCB is stored in the FIFO buffer 50 for its transmission channel. When the code information of the WCB indicates the need to change the speed, an execution-time subroutine executed by a coprocessor sets a bit for the channel control word of each WCB and stops a DMA process when the corresponding video segment is transmitted to initiate an interruption. An interruption handler decides a new line speed and a variable-speed clock is set according to it.