| 摘要 |
A DIGITAL TELEVISION TRANSMITTER (2) TRANSMITS A TRANSPORT STREAM (HEREINALTER RELERRED TO AS "TS" )COMPRISING CONTENT DATA FOR A PLURALITY OF CHANNELS TO RECEIVERS (4). IN THE TRANSMITTER, PROGRAM INFORMATION IS PERIODICALLY INSERTED IN THE TS AND EXPECTED TIME OF PROGRAM ALTERATION IS INCLUDED IN SAID TS. A TELEVISION RECEIVER COMPRISES A FIRST PORTION (225, 227, 228, 231, 232) ALWAYS SUPPLIED WITH AN ELECTRIC POWER, A SECOND PORTION (211, 226) WHICH, IF SUPPLIED WITH A SECOND ELECTRIC POWER, BECOMES CAPABLE OF COLLECTING PROGRAM INFORMATION INCLUEDE IN SAID TS INCORPORATION WITH SAID FIRST PORTION, AND A THIRD PORTION (212) WHICH, IF SUPPLIED WITH A THIRD ELECTRIC POWER, BECOMES CAPABLE OF DISPLAYING SAID PROGRAM. AT AN EXPECTED TIME OF PROGRAM ALTERATION PREVIOUSLY RECEIVED, THE SECOND POWER IS SUPPLIED TO THE SECOND PORTION TO COLLECT PROGRAM INFORMATION, WHICH IS PREFEBLY STORED IN NONVOLATILE MEMORY (226). THE TRANSMITTER SENDING AN ALERT SIGNAL TO THE RECEIVER VIA A SECOND TRANSMISSION MEDIA (5) ENSURES THE RECEPTION OF CHANGED OR SPECIAL PROGRAM INFORMATION.FIG. 3 |
