This is a video scan converter to display NTSC video signal into VGA monitor. Normally, the VGA monitor occupies most desk top space, so that everybody will be thinking that if the VGA monitor can be used for video monitor.
I tried to build a scan converter. Right photo shows my VGA monitor which displays TV. The VGA monitor (Nanao T560iJ) has two VGA inputs, BNCs and a D-sub, it can easy to change its inputs without any external video swicher. A small monitor at left end of the photo is a sub-monitor to be used during the VGA monitor is used for PC.
Now, difference between NTSC and VGA is shown in table 1. The horizontal refresh rate for VGA is just two times faster than NTSC, and vertical refresh rates are equal. Thus, only converting the horizontal refresh rate is sufficient for NTSC to VGA scan converter and its circuit diagram is very simple. If there is difference between vertical refresh rates such as PAL to VGA converter, it will require frame buffer, the circuit diagram will become complexity. I can't give any comment on PAL to VGA conversion.
|Video signal||H sync||V sync|
Figure 1 shows the block diagram for the scan converter. Separated NTSC signal is decoded into RGB signals by the video deocder. The analog RGB signals are digitaized by video A-D converters and written into the line memories. The line memories are read at two times faster than write rate, same data will be read two times during one scan line is written. The timing diagram for this operation is shown in figure 2.
The timing clocks for each block is generated with phase locked loop which locks input horizontal frequency.
The scan converter has fast digital circuit and fast analog circuit. These should be separated from each other to prevent influence of digital noize from digital block to analog block. Especially, the phase locked loop must operate stably, otherwise the scan converter cannot be used for practical use. The phase locked loop is locked to input horizontal frequency stably, then adjust any other trimmer pots.
- Added a video input front end which has video signal distributer and automatic power-on function.
- A-D conveters are replaced from µPD6951C (6bit) to ADC-305 (8bit). Because one of the A-D conveters broke and it has been discontinued, all A-D conveters are replaced.
- TC9122P frequency divider is replaced by a GAL because it cannot operate at 14.3MHz stably.
- Discrete DACs (6bit) are replaced by monolithic DACs (8bit).
- An RGB input channel is added.