Abstract: An encoder generates a TS packet of PSI and PCR in synchronization with reference signals generated by an STC reference signal generator and by a picture sequence reference signal generator. A switching TS of multiplexed packet is produced by encoding and packetizing the signals of pictures and voices. When a TS switch performs stream switching, a controller controls the encoder so that any stream having information is not transmitted. Encoding information amount and transmission information amount of packets are controlled. The transmission timing of a PCR packet is also controlled. A plurality of encoders performs similar processes in synchronization. The TS switch switches switching TS's, forming a single output TS, without introducing transients and characteristic degradation.

Abstract: A plurality of channels can be set so as to be associated with one another and an accounting system can be changed and programs can be drawn up every channel. Only information of a PMT of a program number of a main channel is described in a PAT as an information table of a PMT of a carrier frequency. When there are subprograms concerning the main program, information of the PMT of the subprogram numbers is described in the PMT. Thus, the main channel which can be set from the PAT and the subchannels which are set into the main program and are set from the PMT of the main program can be set. The subchannel can be set after it was set into the main channel and cannot be directly set. In the other cases, the subchannels are channels similar to the main channel and the scrambling and charging can be independently set from the main channel.

Abstract: An encoder generates a TS packet of PSI and PCR in synchronization with reference signals generated by an STC reference signal generator and by a picture sequence reference signal generator. A switching TS of multiplexed packet is produced by encoding and packetizing the signals of pictures and voices. When a TS switch performs stream switching, a controller controls the encoder so that any stream having information is not transmitted. Encoding information amount and transmission information amount of packets are controlled. The transmission timing of a PCR packet is also controlled. A plurality of encoders performs similar processes in synchronization. The TS switch switches switching TS's, forming a single output TS, without introducing transients and characteristic degradation.

Abstract: The present invention which involves a digital broadcasting system provides a digital broadcasting method in which change information NETQ for indicating the broadcast content change is transmitted a certain period of time in advance by a primary transmission system when the primary transmission system broadcasts programs. As the result, a secondary transmission system, for example, a cable television system which reedits and rebroadcasts the programs received from a digital satellite broadcasting system, can easily and quickly rearrange the air time in response to the change such as program content change in the rebroadcasting in the secondary transmission system.

Abstract: A scramble system can effectively prevent a scrambled broadcast from being viewed illegally. In a scramble system in which a video signal scrambled by a scrambling apparatus (10) is descrambled by a decoding apparatus (20), an identification code that specifies the decoding apparatus (20) is inserted into a vertical blanking period of the video signal supplied to the decoding apparatus (20).