Patent ID: 7337461

Claim:
A CATV system comprising: a digital broadcasting transmitting unit for multiplexing content exclusively used for remote controller and contents of broadcast programs, and transmitting the multiplexed contents; a digital broadcasting receiving unit for receiving the multiplexed contents transmitted from the digital broadcasting transmitting unit; a television receiver for displaying contents received by the digital broadcasting receiving unit; and a bidirectional remote controller operable to communicate with the digital broadcasting receiving unit, wherein the digital broadcasting receiving unit includes: a separating device for separating the multiplexed contents from the digital broadcasting transmitting unit into the contents of the broadcast programs and the content exclusively used for remote controller; a transmitter for transmitting the contents of the broadcast programs separated by the separating device to the television receiver; and a communicator for transmitting the content exclusively used for remote controller separated by the separating device to the bidirectional remote controller, the television receiver includes a display for displaying the contents of the broadcast programs transmitted from the transmitter, the bidirectional remote controller includes a display for displaying the content exclusively used for remote controller transmitted from the communicator, and the digital broadcasting transmitting unit includes: a first multiplexer for multiplexing the content exclusively used for remote controller which does not contain service information related to general broadcast programs and contains service information set to watch pay-TV programs not related to general broadcast programs and transmitted by the CATV system, and information for displaying a screen used to purchase pay-TV programs on the display of the bidirectional remote control, and contents of general broadcast programs, and outputting a first transport stream of one channel; a second multiplexer for multiplexing the content exclusively used for remote controller and contents of pay-TV programs, and outputting a second transport stream of one channel; a first digital modulator for modulating the first transport stream outputted from the first multiplexer and outputting a first carrier wave corresponding to the first transport stream; a second digital modulator for modulating the second transport stream outputted from the second multiplexer and outputting a second carrier wave corresponding to the second transport stream; and a frequency multiplexer for multiplexing the first and second carrier waves outputted from the first and second digital modulators and transmitting a multiplexed signal of the multiplexed contents to the digital broadcasting receiving unit.