video display and digitiser
- DCTV - Digital Composite Television - turns digital data from the RGB port to composite television signal
- uses the RGB port as an I/O port for sending compressed video information:
- the information is encoded into special Amiga display screens that DCTV recognises by a signature in the upper-left corner
- these screens contain the digitised and compressed form of the analogue waveform data required to create the composite display
- the resulting composite image quality is far better and much worse than a normal Amiga RGB display:
- for pictures that contain a lot of colour changes (like photographic materials) the quality is as good as everyday television
- in case of pictures with a lot of detail (like text) the display is blurry
- uses the Amiga RAM as framebuffer - requires at least 1 MB of memory for functioning
- supports resolutions from 640×200 to 736×482/566 (NTSC/PAL) in 24 bit
- slow scan video digitiser - captures a still video frame in 6 to 10 seconds
- the parallel port is used for sending digitised images to the Amiga
- composite (RCA) input and output
- DB23 RGB connector passthrough for connecting two monitors at the same time - one for the Amiga (RGB) and one for the DCTV (composite)
- although DCTV does not interfere with normal genlock operation, its output cannot be fed into a genlock without the DCTV RGB Converter
|
