| 摘要 |
A multi-output broadcasting receiving system using a conditional access function of a single STB(Set Top Box) is provided to allow a user to independently view a TV in each room through one STB and simultaneously and remotely control the STB through a remote controller in another place in which the STB is not installed by adopting filter technique to maintain IR(Infrared) data of the remote controller and an RF(Radio Frequency) A/V signal of the TV in a single RF line and decrypting two or more inter-different encrypted channels by using one authentication card. An STB(100) has the first broadcasting reception processing module(110), one or more second broadcasting reception processing modules(120), and a CAS(Conditional Access System)(101). The first broadcasting reception processing module(110) selects a channel of a broadcasting signal received from an external transmission medium according to an input operation of a user, and outputs an A/V broadcasting signal of the selected channel. The second broadcasting reception processing modules(120) select a channel of a broadcasting signal received from the external transmission medium according as a remote control signal is received, modulate the A/V remote broadcasting signal of the selected channel as a certain broadcasting frequency, and output the modulated A/V remote broadcasting signal. If a program identifier is received from the first broadcasting reception processing module(110), the CAS(101) reads a key value corresponding to the program identifier from an authentication card and outputs the read key value to the first broadcasting reception processing module(110). Each of one or more host network connecting units(130) has the first filter(131) and the second filter(132). If an STB control signal is received through a specific network, the first filter(131) filters the STB control signal, and provides the filtered signal as the remote control signal to the second broadcasting reception processing modules(120). If the A/V remote broadcasting signal is received through the second broadcasting reception processing modules(120), the second filter(132) filters the A/V remote broadcasting signal and passes the filtered signal through the network. One or more remote control signal receiving units(150) sense and output the STB control signal transmitted from a remote controller. Each of one or more guest network connecting units(160) has the third filter(161) and the fourth filter(162). If the STB control signal is received through the remote control signal receiving units(150), the third filter(161) filters the STB control signal and passes the filtered signal through the network. The fourth filter(162) filters and passes the A/V remote broadcasting signal provided from the network.
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