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Digital set-top box

A digital set-top box and data technology, applied in image communication, selective content distribution, electrical components, etc., can solve problems such as descrambling delay, achieve the effect of improving channel switching time, enhancing user experience, and reducing channel switching delay time

Inactive Publication Date: 2012-09-19
HUAYA MICROELECTRONICS (SHANGHAI) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In order to overcome the above-mentioned problems in the prior art, the present invention aims to provide a digital set-top box to effectively solve the problem of descrambling delay after the scrambled program in the same source is changed in digital TV and digital set-top box

Method used

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Embodiment Construction

[0028] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0029] like figure 1 As shown, the present invention is a digital set-top box, which includes a tuner / demodulator 6, a demultiplexer 1, a descrambling module 7 and a decoding module 8 connected in sequence.

[0030] The demultiplexer 1 cyclically outputs the current ECM data corresponding to the current scrambled service in the same source and the non-current ECM data corresponding to the non-current scrambled service in the same source in sequence.

[0031] The descrambling module 7 includes a CAS decryption module 2 connected to the demultiplexer 1, and at least one descrambler 3 connected between the demultiplexer 1 and the decoding module 8 and connected to the CAS decryption module 2, wherein :

[0032] The CAS decryption module 2 receives the current ECM data and the non-current ECM data in turn, and decrypts the current ECM data and the no...

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Abstract

The invention relates to a digital set-top box, comprising a demultiplexer, a descrambling module and a decoding module which are connected in sequence, wherein the demultiplexer orderly and cyclically outputs present ECM (Error Correction Model) data corresponding to a present scrambling service in a same information source and non-present ECM data corresponding to a non-present scrambling service in the same information source; and the descrambling module comprises a CAS (Conditional Access System) decryption module connected with the demultiplexer and at least one descrambler which is connected between the demultiplexer and the decoding module and connected to the CAS decryption module. The digital set-top box is capable of obtaining control words for descrambling corresponding to all scrambling services in the same information source in real time while changing channels in the same information source of a digital television or the digital set-top box, therefore, the channel change delay time is greatly shortened and the user experience is obviously improved.

Description

technical field [0001] The invention relates to a digital set-top box. Background technique [0002] CAS (Conditional Access System, Conditional Access System) is the core technology of pay digital TV broadcasting. Its main function is to prevent illegal intrusion into the digital broadcasting network, and allow authorized users to watch specific programs, while preventing unauthorized users from watching. The main task of CAS is to prevent users from receiving unauthorized programs and solve the problem of how to charge users. In the broadcast television system, CAS consists of two parts: the front end (transmitter) and the terminal (receiver). The front end uses the control word (CW: Control word) to complete the scrambling of the program data, so that the transmitted The program data is changed from clear code to password, and the scrambled data is useless to unauthorized users, but the CW for descrambling is provided to authorized users; the front end encrypts the CW (E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/434H04N21/435H04N21/438
Inventor 王清涛李政道吴军
Owner HUAYA MICROELECTRONICS (SHANGHAI) INC
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