MULTI-SCREEN CIRCUIT OF VTR

摘要

The circuit displayes nine sub frames at the same time through four picture-in-picture (PIP) function modes. The tuner of the VTR is separated to by an audio tuner and a video tuner and a digital data memory is replaced by DRAM having three 4-bit dual ports so that the number of memorising field becomes nine. An audio and a video channel are selected by the audio tuner and video tuner respectively. The subframes memoried in the video digital data memory are displayed and converted by selecting the PIP mode to check the contentsof the televised program, while the audio signal is converted according to the conversion of the main frame.