KR100412954B1 - Subscriber terminal apparatus of automatic receiving path varying type in wire broadcast system and method for operating the same - Google Patents

Abstract

PURPOSE: A subscriber terminal apparatus and a method for operating the same are provided to allow users to watch programs even in case of breakdown of scrambler or system maintenance by automatically selecting the path of the image signal of the scrambled channel and general channel. CONSTITUTION: A subscriber terminal apparatus comprises an image processing unit(180) for detecting an image signal from a demodulated signal, de-scrambling the image signal in accordance with a control signal, outputting the de-scrambled signal to a first output terminal, converting a specific signal into a digital signal, and outputting the digital signal to a second output terminal; a reference signal removing unit(130) for receiving the image signal from the first output terminal of the image processing unit, and removing a reference signal; an image signal matching unit(140) including a buffer and an amplifier; an image processing control unit for receiving signal from the second output terminal of the image processing unit, providing a control signal for de-scrambling to the image processing unit, and outputting parts of the signals input from other output terminals; a transmission path control unit for receiving signals output from the image processing control unit, judging a scrambling, and generating a control signal for controlling a transmission path; and a transmission path converting unit for receiving signals from the reference signal removing unit and the image signal matching unit, and selectively outputting signals in accordance with the control signal output from the transmission path control unit.

Description

Receiving Path Automatic Variable Subscriber Terminal Device in Cable Broadcasting System and Its Operation Method

The present invention provides an automatic variable subscriber terminal device of a reception path in a cable broadcasting system which automatically selects a path of a video signal of a non-passing channel and a non-passing channel in a CATV system employing a Korean type secret method. It is about a method.

In general, in the conventional cable TV broadcasting (hereinafter referred to as CATV), the secretion release information is transmitted through communication from the head end (broadcasting station) to the terminal (converter) by a method of releasing the secretion screen. As follows.

1 is a diagram illustrating a network configuration of a conventional CATV system, which can be largely divided into a head end (HE) and subscriber stations (100A to 100N).

Looking at the configuration of the head end (HE), and receives the pay video signal (baseband signal) (PVS) before being modulated and mixed according to the talk control signal, the talker 10, the talker in the talker 10 A channel modulator 20 for modulating the signal to a broadcast channel frequency, and a non-speech control signal for inputting a secretion control signal to the secretary 10 and for recovering the channel later on the subscriber terminals 100A to 100N. A generation control section 30 for generating and outputting a frequency modulation modem 40 for modulating a release signal output from the conversation control section 30 to a frequency other than a broadcasting channel frequency (for example, an out band frequency), and The combiner 50 combines two signals output from the frequency modulation modem 40 and the channel modulator 20 and puts them on one line. In this case, the configuration as described above is to prevent the city office in the case of a pay channel, and in the case of a public broadcasting channel (CVS) through the combine 50 without passing through the phone 10 and the channel modulator 20. Transmitted to the cable network.

Each of the terminals 100A to 100N corresponding to the head end HE configured as described above includes a demodulation unit 110 that tunes and demodulates a broadcast channel frequency and an image demodulated by the demodulation unit 110. A deactivation unit 120 for deactivation according to a deactivation signal demodulated through a frequency demodulation unit (not shown) and a reference for removing a reference signal for deactivation from the deactivation signal from the deactivation unit 120. A signal matching unit 140, a signal matching unit 140, a demodulation unit 110 including a buffer for receiving the demodulated image signal demodulated by the demodulator 110, a buffer for delaying and storing a predetermined time delay, and an amplification unit for compensating the attenuation of the signal. Accesses data stored in the memory 150 and the data stored in the memory 150 in advance to determine whether the channel currently tuned has been secreted. A control unit 160 for generating a control signal, and a signal output from the reference signal removing unit 130 or the signal matching unit 140 under the control of the control unit 160 and selectively inputs the signal to an image device such as a TV. It consists of a switch 170 for transmitting.

In the conventional CATV system configured as described above, when the pay channel is a broadcast channel (HE), the screen is transmitted through the talker 10 and the memory 150 is used by the converters 100A to 100N on the terminal side. Accesses the memory contents stored in the memory to determine whether the currently tuned channel is a pay channel, that is, a non-call channel.

At this time, if it is determined that the non-deactivation channel, the transmission path of the switch 170 transmits the signal input from the reference signal removing unit 130 to the image device side.

In addition, when the channel is not secreted, under the control of the controller 160, the transmission path of the switch 170 transmits a signal input from the signal matching unit 140 to the image device side.

However, if the fire station provided on the broadcasting station side is broken or the channel to be sparked due to the repair of the system is transmitted without being sparked, the converter on the subscriber station side does not have a criterion to authenticate this fact. Since the normal signal is decrypted according to the decryption information, the viewer may rather see the secret screen.

Accordingly, the inconvenience of having to wait until the problem is solved at the broadcasting station because it is unable to watch a normal screen has been presented as a problem.

An object of the present invention for solving the above problems is to detect a specific data that is essentially inserted into the video signal passing through the igniter, and then check the signal state of the corresponding data to determine the deactivation path or non-deactivation based on this. The present invention provides a subscriber station automatically variable receiving path in a cable broadcasting system capable of setting a release path and a method of operating the same.

1 is a configuration example of a conventional cable broadcasting system

2 is an exemplary configuration diagram of a subscriber station device according to the present invention.

<Description of the symbols for the main parts of the drawings>

110: demodulation unit 130: reference signal removal unit

140: signal matching unit 160A: controller

170: switch 180: image processing means

190: digital logic 190A: reset circuit

A feature of the present invention for achieving the above object is, in a subscriber station for receiving and demodulating a video signal generated by a broadcasting station providing a non-finished screen for a specific video signal to the cable communication network to display and view it Image processing means for detecting an image signal from the demodulated signal, releasing the input image signal according to the control signal, outputting the signal to the first output terminal, and converting a specific signal among the detected signals into a digital signal and outputting the signal to the second output terminal. And a reference signal removing unit which receives the non-deactivated video signal output from the first output terminal of the image processing unit, and removes the reference signal, and a buffer and attenuate the signal that receives the demodulated video signal for a predetermined time delay. An image signal matching unit comprising an amplifying unit to compensate for the accuracy, An image processing control means for receiving a signal output from the second output terminal of the means and providing a control signal for deactivation to the image processing means and outputting a part of a signal input to another output terminal based on the signal; Transmission path converting means for receiving the signal output from the remover and the image signal matching unit and selectively outputting the signal according to the control signal, and receiving the signal output from the image processing control means and determining the presence or absence on the basis of the signal state value. And transmission path control means for generating a control signal to the transmission path conversion means.

Another feature of the present invention for achieving the above object is, after receiving and demodulating a video signal generated by a broadcasting station providing a non-scrambled screen and a non-finished screen for a specific video signal to the cable communication network, according to the nature of the screen A method of operating in a subscriber station for displaying a decoded screen and displaying the same or directly displaying the first screen, the method comprising: a first step of detecting, as digital data, reference data according to the presence or absence of secretion existing at a specific position in a demodulated signal; A second process of determining whether the bit states of the digital data detected in the process are all low; and a third process of turning off the path for clearing if the bit states of the corresponding data are all low in the second process, And displaying the movie screen when the non-fire path is blocked through the above process. The following includes the fourth process of turning on the path.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of a variable reception path automatic subscriber station device in a wired broadcasting system according to the present invention, a demodulator 110 for tuning and demodulating a specific broadcast channel frequency among broadcast signals received from a cable communication network (CN); Detects the video signal from the signal output from the demodulator 110 and releases the video signal input according to the control signal to the first output terminal, converts the specific signal from the detected signal into a digital signal, and outputs the second signal to the second output terminal. An analog logic 180 for outputting a signal, a reference signal remover 130 for receiving a non-deactivated video signal output from the first output terminal of the analog logic 180, and removing a reference signal, and a demodulator 110 A signal matching unit 140 including a buffer for receiving the demodulated video signal at a predetermined time delay and storing the delayed signal for a predetermined time, and an amplifying unit to compensate for the attenuation of the signal; Digital logic for receiving a signal output from the second output terminal of the analog logic 180, and transmits a control signal for deactivation to the analog logic 180 based on this, and outputs some of the signals input to the other output terminal ( 190 and the controller 160A which receives the signal output from the digital logic 190 and determines whether there is a spark or not based on a signal state value, and generates a control signal, and the reference according to the control of the controller 160A. The switch 170 is configured to receive a signal output from the signal remover 130 or the signal matcher 140 and selectively transmit the signal to the image device such as a TV.

In addition, the digital logic 190 requires one or more resets of the first horizontal sync signal and the ninth horizontal sync signal of odd frames of every frame for the normal operation of the configuration. It is provided.

This is because, if the reset operation is not performed, the non-encrypted video signal has no data for non-deactivation, but both the command and tag data do not become " 0 ".

A preferred operation example of the variable reception path device in the wired broadcasting system according to the present invention configured as described above is as follows.

In general, data for decrypting a passivated video signal passed through the pager is loaded on the 10th line of the horizontal signal.

The signal is detected by the analog logic 180, converted into a digital signal, and then transferred to the digital logic 190. The digital logic 190 transmits a control signal to the analog logic 180 to de-encrypt based on the signal. The analog logic 180 de-secrets and outputs the secreted video signal accordingly, and the output video signal is transmitted to the reference signal remover 130 to remove the reference signal.

In this case, the digital logic 190 transmits command COMM and tag data among the data input from the analog logic 180 to the controller 160A. In the controller 160A, the command and tag data are transmitted. It is determined whether the signal states of are all "0" or have an arbitrary bit value.

Checking the signal state of the command and tag data in the controller 160A generally means that the command and tag data have an arbitrary bit value in a video signal that has been ignited through a normal scrambler, but if the command is not normally struck, the command. This is because both and tag data have a value of "0".

At this time, if it is determined that the controller 160A has normally passed through the sparkler, the controller 170 controls the switch 170 so that a signal input from the reference signal removing unit 130 is transmitted to the TV side.

If both the command and tag data have a value of "0", the switch 170 is controlled to output a signal output through the signal matching unit 140.

According to the present invention, the variable subscriber path apparatus and the operation method thereof according to the present invention operate as described above, so that the subscribers can watch the correct screen even during an unscheduled breakdown or system operation. have.

Claims (5)

A subscriber station that receives, demodulates, and displays a video signal generated by a broadcasting station that provides a non-visualized screen with respect to specific video signals, and then displays the demodulated signal. The subscriber terminal detects a video signal from the demodulated signal and controls a control signal. Image processing means for releasing the image signal inputted according to the output signal to the first output terminal, converting a specific signal of the detected signals into a digital signal, and outputting the digital signal to the second output terminal; A video signal matching unit including a reference signal removing unit for receiving a non-decoded video signal and removing a reference signal, a buffer for receiving a demodulated video signal and storing a predetermined time delay and an amplifying unit for compensating attenuation of the signal; Receives a signal output from the second output terminal of the image processing means An image processing control means for providing a control signal for clearing a secret to the image processing means and outputting some of the signals input to the other output terminal, and receiving a signal output from the image processing control means to obtain a signal state value. Transmission path control means for generating a control signal for controlling the transmission path by determining the presence or absence of the reference, and control received by the signal output from the reference signal removing unit and the image signal matching unit and output from the transmission path control means And a transmission path converting means for selectively outputting the signal according to a signal. The method of claim 1, When the transmission path control means determines that the bit logic states of the signals input by the image processing control means are all low, the transmission path conversion means controls to output the output signal of the video signal matching unit. Receiving path automatic variable subscriber station device in. The method of claim 1, When the transmission path control means determines that the bit logic state of the signal input from the image processing control means is not all low, the transmission path conversion means for controlling to output the output signal of the reference signal removing unit; Receiving path automatic variable subscriber station device in broadcasting system. The method of claim 1, And receiving means for resetting the image processing control means to reset the first horizontal sync signal and the ninth horizontal sync signal of odd frames of every frame of the demodulated video signal. Automatically variable subscriber station device. Receives and demodulates video signals generated by broadcasting stations that provide unscrambled screens and non-scrambled screens for specific video signals through a cable communication network, and displays or directs the unscrambled screens according to the characteristics of the screen. A method of operating in a terminal, the first process of detecting reference data according to the presence or absence of the presence of a non-decoded signal from the demodulated signal and the bit state of the digital data detected in the first process are all low? A second process of determining a; and a third process of turning off a path for deactivation when the bit states of the corresponding data are all low in the second process, and if the deactivation path is blocked through the process, movieizing And a fourth process of turning on a path for displaying a screen. A method of operating a subscriber station automatically variable receiving path in a cable broadcasting system, characterized in that.