SIGNAL EXCHANGE APPARATUS OF A TELEVISION RECEIVER WITH A HDTV MAIN PICTURE SIGNAL PROCESSOR AND A NTSC PICTURE-TO-PICTURE SIGNAL PROCESSOR.

摘要

A TELEVISION RECEIVING SYSTEM THAT HAS PIP CAPABILITY INCLUDES TWO NTSC TUNERS (124,126) AND SIGNAL PROCESSING MOUNTS (134,143,145,136,140,142), AND AN HDTV TUNER (122) AND A SIGNAL PROCESSING MOUNT (132,16,162). TO PERFORM A CHANNEL CHANGE FUNCTION, A CONTROLLER (180) SEARCHES A TABLE TO INDICATE PARITY DATA OF NTSC CHANNELS AND HDTV CHANNELS, THE NTSC CHANNEL ASSOCIATED WITH THE MAIN HDTV CHANNEL SOURCE IS TUNED BY THE PIP NTSC TUNER (126) , AND THE HDTV CHANNEL ASSOCIATED WITH THE PIP NTSC SOURCE IS TUNED BY THE HDTV TUNER (122). IF THE INTERLOCKED IMAGE (205) DOES NOT HAVE A PARITY HDTV CHANNEL THEN THE SECOND NTSC TUNER (124) IS CONTROLLED TO SELECT THE TUNED CHANNEL BY THE NTSC PIP TUNER (126).