| 摘要 |
Method and apparatus for recording a frame, comprising two fields, of document information on a disc storage device are described. The video signals corresponding to the two fields are used to amplitude modulate quadrature components of a single carrier frequency, each field modulating its own quadrature component. The quadrature amplitude modulated (QAM) carrier components are vectorially combined, the resultant being then angularly modulated on a high frequency carrier which is recorded on the disc storage device. In a preferred embodiment, a frame of information is recorded on the disc storage device along a single closed circular track. The present invention also provides methods for playing back the single track of recorded information for field-sequential video display, hard copy reproduction by a dual-line printer, or hard copy reproduction by a line-sequential printer.
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