Remote control apparatus for digital cable television system and method thereof
First Claim
1. A remote control apparatus for a digital cable television (CATV) system, comprising:
- a transmitting means for carrying a control signal on an MPEG transport stream of each channel for a remote control of a high definition television (HDTV) VSB/QAM receiving unit and transmitting the same, and remotely monitoring and controlling a state of the HDTV VSB/QAM receiving unit in accordance with a state checking signal from the HDTV VSB/QAM receiving unit; and
a receiving means for receiving a control signal from the transmitting means, controlling the HDTV VSB/QAM receiving unit, modulating a state checking signal from the HDTV VSB/QAM and transmitting the thusly modulated signal to the transmitting means.
1 Assignment
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Accused Products
Abstract
A remote control apparatus for a digital cable television system and a method thereof which are capable of inserting and transmitting a control data into each channel of a head end (HE) which is an output unit of a transmitting unit and modulating a state checking data of a receiving unit for a VSB/QAM receiving unit based on a QPSK method, thus upwardly transmitting the date, whereby it is possible to remotely control and monitor a VSB/QAM receiving unit without additionally allocating a frequency band width. The apparatus includes a transmitting unit for carrying a control signal on an MPEG transport stream of each channel for a remote control of a high definition television (HDTV) VSB/QAM receiving unit and transmitting the same, and remotely monitoring and controlling a state of the HDTV VSB/QAM receiving unit in accordance with a state checking signal from the HDTV VSB/QAM receiving unit, and a receiving unit for receiving a control signal from the transmitting unit, controlling the HDTV VSB/QAM receiving unit, modulating a state checking signal from the HDTV VSB/QAM and transmitting the thusly modulated signal to the transmitting unit.
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Citations
9 Claims
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1. A remote control apparatus for a digital cable television (CATV) system, comprising:
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a transmitting means for carrying a control signal on an MPEG transport stream of each channel for a remote control of a high definition television (HDTV) VSB/QAM receiving unit and transmitting the same, and remotely monitoring and controlling a state of the HDTV VSB/QAM receiving unit in accordance with a state checking signal from the HDTV VSB/QAM receiving unit; and
a receiving means for receiving a control signal from the transmitting means, controlling the HDTV VSB/QAM receiving unit, modulating a state checking signal from the HDTV VSB/QAM and transmitting the thusly modulated signal to the transmitting means. - View Dependent Claims (2, 3, 4, 5, 6)
an MPEG encoder for encoding a base band and video/audio signal of each channel into the MPEG transport stream;
a VSB/QAM modulator for modulating an output signal from the MPEG encoder;
a multiplexer for multiplexing an output signal from the VSB/QAM modulator of each channel;
a diplex filter for preventing an upward signal from being influenced when transmitting the output signal from the multiplexer to the receiving unit through the transmission network;
a master modem for demodulating a signal from the receiving unit through the diplex filter and outputting a transmission signal to the MPEG encoder; and
a remote controller connected with the master modem through a communication cable for remotely monitoring a state of the HDTV VSB/QAM receiving unit in accordance with a state checking signal from the HDTV VSB/QAM receiving unit through the master modem.
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3. The apparatus of claim 2, wherein said master modem polls a HDTV VSB/QAM receiving unit in accordance with a functional code and a data control or a setting code, receives a data which is checked by the HDTV VSB/QAM receiving unit and transmits the data to the remote controller.
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4. The apparatus of claim 1, wherein said receiving means includes:
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a diplex filter for preventing an upward signal from being influenced by a downward signal received from the head end through a transmission network which head end is an output unit of the transmitting unit;
a tuner for tuning the downward signal from the diplex filter and outputting an IF signal;
a signal separator for a downward signal from the diplex filter to the tuner and an additionally connected external terminal;
a signal processor for processing an IF signal from the tuner and outputting a base band, video/audio signal, and a control signal;
a state checking unit for outputting a state checking signal of the HDTV VSB/QAM receiving unit;
a controller for controlling the HDTV VSB/QAM receiving unit in accordance with a control signal from the signal processing unit and outputting a state checking signal from the state checking unit; and
a slave modem for QPSK-demodulating a state checking signal from the controller and outputting to the diplex filter.
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5. The apparatus of claim 4, wherein said slave modem receives a data control signal through the master modem, initializes the HDTV VSB/QAM receiving unit, receives a setting code, and downloads an initialization setting value for the HDTV VSB/QAM receiving unit.
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6. The apparatus of claim 4, wherein said diplex filter and slave modem are configured in a form of a plug-in-module for being installed in a channel board of the HDTV VSB/QAM receiving unit.
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7. A remote control method for a digital cable television, comprising the steps of:
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transmitting a functional code and data control code/setting code from a remote controller to a master modem after an initialization;
judging whether a data received is corrected by the master modem and transmitting a receiving unit data control or setting code to a slave modem in a correction mode;
identifying a data received and an ID, requesting a data re-transmission to a master modem when there is an error in the data received from the slave modem, judging whether the current mode is a correction mode when there is not an error therein, initializing a receiving unit after a receiving setting code is received when the current mode is a correction mode as a result of the judgement, correcting data, and transmitting the state checking data to the master modem when the current mode is not a correction mode;
identifying a data transmitted from the slave modem in the master modem, requesting a data re-transmission when there is not an error in the data and transmitting a state checking data to the remote controller when there is not an error; and
checking and diagnosing the data transmitted thereto, performing a receiving unit control code when there is an error in the data, and processing, storing and displaying the data when there is not an error therein. - View Dependent Claims (8, 9)
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Specification