Application of Adding Distraction System in Cable TV System (1)

At present, in the management of cable TV systems, especially small and medium-sized cable TV systems, there are widespread problems such as difficulty in charging, serious cost loss, poor network security, and backward management methods. Before the advent of the digital TV era, cable TV networks The medium application plus descrambling system is a technical means to solve the above problems. According to the local actual situation, we have chosen a digital segmentation plus descrambling system.

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1, system composition

1.1 front end configuration

(1) 1 synchronous data generator;

(2) 1 scrambler / per channel;

(3) Modulator (with 38 MHz IF input and output interface) 1 / per channel;

(4) PC 1;

(5) 1 set of charge management software;

(6) One set of system connection cable.

1.2 client

One descrambler (set top box) corresponds to one TV set and external power adapter. The composition of the system is shown in Figure 1.

Figure 1 The composition of the plus descrambling system

2, the system's functions and features

(1) Management function: 1 User management, record the basic situation of the user, to achieve the registration, recording, query and other operations for the user; 2 charge management, accept the user's payment of the scramble channel viewing fee, and have the charge information query Basic functions of charging and writing card printing; 3 authorization management, sending corresponding authorization control information to the descrambler according to the charging situation; 4 front-end control, controlling the working state of the scrambler and generating the scramble control key.

(2) Addressable authorization, which is automatically opened after the user pays the fee.

(3) The 1-5 segment digital segmentation scrambling can be arbitrarily segmented and is not restricted by the physical channel.

(4) The video transmits data in reverse range, and does not occupy channel resources.

(5) Support group solution function.

(6) Support for the pass-through function.

(7) The descrambler has both induction signal input and video input, and is suitable for various television sets.

(8) Support the function of the slave machine to solve the problem of charging for one multi-machine;

(9) can be divided into 5 groups of charging categories, each channel can be arbitrarily divided, adjusted at any time, not subject to physical channel restrictions.

(10) Does not change the user's previous usage habits.

3, system principle

3.1 Scrambling principle

The data sent by the synchronous data signal generator is sent to the scrambler, and the video signal sent from the program source is controlled by the time base to stabilize the output video signal, and the time base control is further extended according to the segmentation information sent by the control module. Output. The video signal output by the time base control module is sent to the data insertion module, and after the data is inserted in the field reverse, the output is output to the modulator. The scrambling module scrambles the intermediate frequency signal according to the control information of the control module. The control module generates correct segmentation information and scrambling information based on the local settings and the settings of the front-end computer. The control key and user authorization information that control the change of the scrambling are sent to the network transmission along with the scrambled image signal after multiple encryption processing. The principle of system scrambling is shown in Fig. 2.

Figure 2 System scrambling schematic

The output video signal is processed into a digital signal recognizable by the segment processor to the segment processor. The main processor processes the data signal and segmentation information sent by the demodulator, generates a correct descrambling control signal according to the authorization condition of the machine, and controls the state indicating circuit to reflect the working state of the machine. The system descrambling principle is shown in FIG. 3. .

Figure 3 System descrambling schematic

3.2 Principle of descrambling

The descrambler consists of two parts: data demodulation and TV signal descrambling. After the RF signal is input, it is divided into two channels, one is sent to the data demodulator, and the other is sent to the descrambling module. The descrambling module performs descrambling according to the descrambling control information generated by the main processor. The data signal generated by the data demodulation module is sent to the main processor, and the main processor performs error detection, decryption, and verification on the data, and extracts correct encryption information and control information. The inductive processing module processes the sensed signal and converts it into a digital signal recognizable by the segment processor, and sends it to the segment processor for identification processing. Video recognition module will set the TV

4, system application

4.1 preliminary preparation

(1) Propaganda explanation

Cable TV application plus descrambling system is a management style reform, involving thousands of households. For cable TV operators, it is undoubtedly a means to solve the problem of difficulty in charging and improve management level. However, at the same time with the user's tradition The concept of consumption will collide, even if the user who legally registers for normal payment is psychologically uncomfortable. According to this situation, it is necessary to do some publicity and explanation work in advance, and strive to get the approval of the majority of users. In addition to using the TV media for publicity and introduction, we also printed a large amount of promotional materials, which were distributed on a case-by-case basis and truly became household names. In addition, in the toll hall, the user notice, the descrambler step, the charging policy, etc. are posted, so that the user can understand the consumption. Before each optical node performs scrambling, it notifies the user of the scrambling time of the area in advance, and also creates a video program for understanding the use of the scrambler, and plays it on the television and in the toll hall, so that the user can grasp the common sense of the descrambler.

(2) Formulate work procedures and train relevant personnel

The dispatch of the descrambler is divided into three steps, namely, verification (opening), charging, and filing authorization. Please ask the system product provider to provide professional training for the operator of the charge and file authorization. In addition, a certain number of equipment maintenance and installation personnel are trained. Their job is to help the user install the descrambler and solve the problem raised by the user. During this period, a user complaint hotline was set up. After the user complained about the call, the equipment maintenance personnel were on hand to serve at any time. During the release of the descrambler, the relevant staff members went to work as usual, and did not rest at noon.

(3) Front-end equipment room preparation

The device with the descrambling system needs to be installed in the front-end equipment room, and it is installed in the same rack as the original front-end equipment. It is necessary to leave a corresponding position on the rack. Before the installation, the front frame was carefully adjusted, and the wiring, power supply, and grounding were comprehensively arranged. The PC used for control at the front end also keeps the installation location, one is easy to connect with other devices, and the other is convenient for administrators to operate. The modulators are all replaced with a 38 MHz IF input interface for easy connection to the scrambling device. In addition, a set of optical transmitters and optical splitters and other related equipment are backed up.

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