| 摘要 |
A video signal processing system including a scaler and a VBI decoder is provided. The video signal processing system includes a control signal generator for generating a mode select signal for selecting one of a normal mode for reading or writing the active video data from or to the memory, and a VBI mode for reading or writing the VBI data from or to the memory. A control signal is also generated for enabling data to be read or written from or to the memory in each of the modes. A multiplexer multiplexes active video data and VBI data in accordance with the mode select signal. There is also provided write control means for receiving the signal output from the multiplexer, and if the memory write is enabled by the control signal generator, for scaling the active video data by a predetermined ratio during an active video interval to write the scaled active video data to the memory, or writing the VBI data to the memory during a vertical blanking interval (VBI), and read control means for reading scaled active video data from the memory by a FIFO method during the active video interval, or reading the VBI data from the memory by a FIFO method during the VBI, and outputting the read data, if the memory read is enabled by the control signal generator. Thus, active video data and vertical blanking data can be processed in an active interval and a vertical blanking interval, respectively, by a time-division method using the scaler memory.
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