Interactive video distribution systems – Video distribution system with upstream communication – Receiver
Reexamination Certificate
1998-03-09
2001-10-16
Grant, Chris (Department: 2611)
Interactive video distribution systems
Video distribution system with upstream communication
Receiver
C348S554000
Reexamination Certificate
active
06305021
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a cable TV (CATV) for video-displaying and audio-outputting broadcast signals received from a respective CATV broadcast station, and more particularly, to a CATV for video-displaying and audio-outputting analog broadcast signals and digital broadcast signals received from CATV broadcast stations.
CATVs are operative to video-display and audio-output broadcast signals that have been transmitted from CATV broadcast stations. CATV systems originated as a supplement to community antenna television systems and served to distribute an aerial signal received via a master antenna to poor reception areas. In the past conventional CATVs included equipment for receiving and demodulating only signals modulated in analog form since CATV broadcast stations for providing aerial broadcasts and independent programs typically supplied only analog signals according to the NTSC standard. Recently CATV broadcast stations have begun to provide broadcast programs transmitted in the form of digital broadcast signals for providing moving pictures of high quality and stable transmission of the broadcast signals, and a variety of services using bidirectional communications to users.
However, since such a conventional CATV processes only analog broadcast signals, the users must purchase an additional digital broadcast signal processing apparatus capable of performing a bidirectional communication and an apparatus which interfaces the digital broadcast signal processing apparatus with the conventional analog CATV, in order to receive the digital broadcast programs supplied recently from CATV broadcast stations and the bidirectional communication service.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide an analog/digital CATV capable of performing a bidirectional communication in which both an analog broadcast and a digital broadcast can be viewed with a single CATV.
To accomplish the above object of the present invention, there is provided a CATV for video-displaying and audio-outputting an analog broadcast signal and a digital broadcast signal which are received from a CATV broadcast station, the CATV comprising: an analog broadcast signal processor for receiving and amplifying only a signal of a particular channel selected by a user among the analog broadcast signal, and restoring a first video signal and a first audio signal contained in the received and amplified analog broadcast signal; a digital broadcast signal processor for decoding the received digital broadcast signal into digital video and audio signals, and digital-to-analog converting the decoded digital video and audio signals into the analog video and audio signals to generate second video and audio signals; a monitor for video-displaying and audio-outputting the first video and audio signals received from the analog broadcast signal processor and the second video and audio signals received from the digital broadcast signal processor; an output signal selector for selectively applying the first video and audio signals received from the analog broadcast signal processor and the second video and audio signals received from the digital broadcast signal processor to the monitor; a remote controller; and a controller for controlling the analog broadcast signal processor to receive only the signal of the particular channel according to the select channel of the user received from the remote controller, and controlling the operation of the output signal selector according to the analog/digital broadcast select received from the remote controller so that the first video and audio signals received from the analog broadcast signal processor and the second video and audio signals received from the digital broadcast signal processor are selectively applied to the monitor, wherein the controller generates an upstream signal according to the upstream data received from the remote controller and the digital broadcast signal processor transmits the upstream signal generated from the controller to the CATV broadcast signal.
REFERENCES:
patent: 5638112 (1997-06-01), Bestler et al.
patent: 5774195 (1998-06-01), Miyahara et al.
patent: 5826166 (1998-10-01), Brooks et al.
patent: 5898463 (1999-04-01), Nishiyama
patent: 5982411 (1999-11-01), Eyer et al.
patent: 6014178 (2000-01-01), Jeon et al.
Grant Chris
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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