CN201467353U

CN201467353U - Digital television micro-region control system

Info

Publication number: CN201467353U
Application number: CN2009200624851U
Authority: CN
Inventors: 庄恒; 赵云峰; 王函; 齐龙兵
Original assignee: Zhongshan Cable & Telemedia Co Ltd
Current assignee: Zhongshan Cable & Telemedia Co Ltd
Priority date: 2009-08-11
Filing date: 2009-08-11
Publication date: 2010-05-12
Anticipated expiration: 2019-08-11

Abstract

The utility model discloses a digital television micro-region control system. The system comprises a demodulator, a multiplexing scrambler and a modulator, wherein the demodulator is utilized to receive RF (radio-frequency) public television signals existing in a small machine room in a control region and coming from an overall front end, and collect PSI (program special information) and SI (service information) from the RF public television signals; the multiplexing scrambler is utilized to receive the PSI and the SI collected by the demodulator, and generate region control signals of the control region after amending a NIT (network information table); and the modulator is utilized to receive output signals of the multiplexing scrambler, and the output signals are output after the modulation. The utility model realizes precision control and management in a digital television micro-region, and has the strong capacity of fault and disaster tolerance and extremely high reliability; and compared with the cost for constructing a CA (condition acceptance) system, the utility model greatly reduces the cost.

Description

A kind of small area control system of digital television

Technical field

The utility model belongs to the digital television broadcasting field, relates to a kind of small area control system of digital television.

Background technology

In the evolution of digital television techniques, user's district management is paid close attention to by operator always.The condition that existing Region control scheme must be built different parameters in each control area receives the CA system, the sectoring function that receives the CA system by condition makes the region code that different region allocation is different, the realm identifier of user side is stored in the smart card, the realm identifier of region code and smart card must mate just gives user's rights of using, thereby realize user's orderly partition management, prevent of the transregional use of the secondary machine smart card of low charge, avoided the large tracts of land diffusion of pirate smart card as host card.But it is excessive that above-mentioned condition receives CA system construction cost, generally can only be arranged in the big regional extent such as city, small towns, and not be suitable for zonules uses such as sub-district, hotel, the problem that therefore still exists smart card to flow privately in big zone.

The utility model content

For addressing the above problem, the utility model provides the small area control system of digital television that a kind of reliability height, cost are lower, can realize smart keyholed back plate reason.

The small area control system of digital television that the utility model provides comprises: demodulator, be used for receiving the control area small room existing, from the RF radio frequency public TV signal of general headend, and therefrom extract program specific information PSI/ business information SI; Multiplexing scrambler, the program specific information PSI/ business information SI that the receiving demodulation device extracts revises the back and produces Region control information; Modulator receives the output signal modulation back output of multiplexing scrambler.

Further, the input signal of described multiplexing scrambler also comprises the local program transport stream, multiplexing scrambler has network interface, multiplexing scrambler is connected with Ethernet by described network interface, reception is from the long-range scramble information of general headend, and the local program transport stream utilizes long-range scramble information to encrypt the back with the Region control information multiplexing and output in the described modulator.

The beneficial effects of the utility model are: the utility model can be applied in the different zones as required, the place, control point that is choosing, by access control system in parallel between distributor and blender, Region control just can be implemented, realized " the seamless insertion " of system, easily build easy-to-usely, the size of control area and position all can be provided with flexibly, have really realized regional smart keyholed back plate reason; Because the public programme signal of Digital Television is provided with independently transmission by-pass, and the security fault-tolerance treatment mechanism is arranged in the set-top box, does not influence watching of user during the control system fault, fault-tolerant superfluous calamity ability is strong; The single devices technology maturation of forming control system has very high reliability, receives the CA system with condition and compares, and cost reduces greatly.

In addition, multiplexing scrambler can receive the local program transport stream, the local program transport stream can in multiplexing scrambler, encrypt and with the Region control information multiplexing after export, therefore, this control system can become the platform that intercuts of local program, can utilize personalized zone to intercut and run recoup capital outlay cost and realization profit.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is a typical application hardware block diagram of the present utility model;

Fig. 2 is the flow chart of the utility model processing procedure.

Embodiment

With reference to Fig. 1, small area control system of digital television of the present utility model comprises demodulator, multiplexing scrambler and modulator, it is existing that wherein demodulator is used for receiving the control area small room, RF radio frequency public TV signal from general headend, and therefrom extract program specific information PSI/ business information SI, multiplexing scrambler is used for the program specific information PSI/ business information SI of receiving demodulation device extraction and the back of making amendment produces the Region control information of control area, modulator is used to receive the output signal modulation back output of multiplexing scrambler, and the type of modulator is selected the QAM modulator for use.At the place, control point that chooses, by the above-mentioned small area control system of access in parallel between distributor and blender, Region control just can be implemented, and has realized " the seamless insertion " of system, easily builds easy-to-use.

In addition, the input signal of multiplexing scrambler also comprises the local program transport stream, multiplexing scrambler has network interface, multiplexing scrambler is connected with Ethernet by described network interface, reception is from the long-range scramble information of general headend, and the local program transport stream utilizes long-range scramble information to encrypt the back with the Region control information multiplexing and output in the described modulator.Therefore, this small area control system provides the insertion platform of a local program signal, when needing to realize intercutting, as long as local program is uploaded in the server, remote control is broadcasted, import multiplexing scrambler with the form of TS transport stream, and multiplexing together with Region control information, and modulation output at last gets final product.

Below in conjunction with Fig. 2 zonule of the present utility model control and treatment process is described.

With reference to Fig. 2, after entering the control area, the RF radiofrequency signal that general headend passes down utilize distributor to distribute, one the tunnel as the public programme signal of Digital Television, the public programme signal of Digital Television is directly delivered in the blender of rear end by bypass, one the tunnel utilizes demodulator to carry out demodulation process S2, extracts program specific information PSI/ business information SI.Comprise among the program specific information PSI/ business information SI one with this big regional extent in a corresponding network information table NIT, inserted the restricted regional descriptor of this big regional extent among the network information table NIT, in order to realize control to this big regional extent affiliated subdistrict territory scope, S3 need make amendment to the network information table NIT among the program specific information PSI/ business information SI, make its restricted regional descriptor corresponding with the zonule that will control, thereby produce Region control information, the modification S3 process of network information table NIT is generally carried out in multiplexing scrambler.Needing earlier local program to be carried out encoding process in the time of need intercutting local program makes it become the local program transport stream that is fit to transmission, the local program transport stream is encrypted behind the S3 and Region control information multiplexing S4, the encryption S3 of above-mentioned local program transport stream and also finish in multiplexing scrambler with the multiplexing S4 process of Region control information.After modulating S5 and the public programme signal of Digital Television is mixed S6, local program transport stream after multiplexing and Region control information via deliver to user's STB terminal, in wire transmission, modulation system generally adopts QAM modulation (quadrature amplitude modulation, i.e. quadrature amplitude modulation).User's set-top box extract the Region control information that receives and with smart card in the realm identifier that stores compare S8, if coupling, normal programme content is play in set-top box work; If do not match, set-top box quits work; If because control system equipment or network failure cause set-top box not receive Region control information, set-top box can be enabled security fault-tolerance treatment S 9 mechanism, works on, and plays normal programme content.Utilize said method can realize the control of a plurality of zonules under the big regional extent, each zonule can be provided with different Region control information, corresponding with it, smart card in the zonule has different realm identifiers, therefore the smart card between the zonule can not circulate privately, thereby has realized the smart keyholed back plate reason of zonule.

Claims

1. small area control system of digital television is characterized in that comprising:

Demodulator, be used for receiving the control area small room existing, from the RF radio frequency public TV signal of general headend, and therefrom extract program specific information PSI/ business information SI;

Multiplexing scrambler, the program specific information PSI/ business information SI that the receiving demodulation device extracts revises the back and produces Region control information;

Modulator receives the output signal modulation back output of multiplexing scrambler.

2. a kind of small area control system of digital television according to claim 1, the input signal that it is characterized in that described multiplexing scrambler also comprises the local program transport stream, multiplexing scrambler has network interface, multiplexing scrambler is connected with Ethernet by described network interface, reception is from the long-range scramble information of general headend, and the local program transport stream utilizes long-range scramble information to encrypt the back with the Region control information multiplexing and output in the described modulator.