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Scrambling unit for digital transmission system

A transmission system, digital technology, applied in the direction of pulse modulation television signal transmission, electrical components, television, etc., can solve the problems of algorithm limitation of security level, multiplexer and access control system communication management difficult to achieve, etc.

Inactive Publication Date: 2004-11-03
纳格拉法国两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although such a system is relatively simple from an implementation point of view, the management of communications between the multiplexer and the access control system is likely to be difficult to implement
Furthermore, the complexity of the algorithm used by the multiplexer to generate the scrambled control word often limits its level of security

Method used

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  • Scrambling unit for digital transmission system
  • Scrambling unit for digital transmission system
  • Scrambling unit for digital transmission system

Examples

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Embodiment Construction

[0034] Referring now to FIG. 1, a scrambling system for a digital television central console 2 and a control word generator 3 is shown. As shown, the control word generator 3 may be a PC type computer including a smart card reader for accepting a smart card (see description below) containing an encryption key for marking data. In addition, the control word generator may be a rack-type unit, an add-on card inserted into the console 2, or the like.

[0035] The scrambling unit 1 receives at its input unscrambled transport data packets from a multiplexer 4 and streams a scrambled transport data stream to a modulator 5 for transmission over a suitable satellite transmission chain. road or similar link prior to transmission.

[0036] Multiplexer 4 may be any conventional multiplexer conforming to the MPEG standard and capable of receiving digital video, audio, teletext, etc. information and generating a non-encrypted stream of transport packets from this data. In a general MPEG b...

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PUM

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Abstract

An independant scrambling unit 1 for a digital audiovisual transmission system, the scrambling unit 1 comprising an input for receiving an assembled transport packet stream from a physically separate multiplexer 4, a scrambling device for scrambling the received transport stream according to a randomising control word and an output for sending the scrambled transport stream to a transmitter means for subsequent transmission. The scrambling unit 1 may also be used to introduce other packet data in the data stream.

Description

technical field [0001] The present invention relates to a scrambling unit for a digital audio-visual transmission system, in particular to a digital television transmission system with a scrambling system comprising such a scrambling unit. Background technique [0002] The transmission of scrambled or encrypted data is known in the field of digital pay television systems, where encrypted audiovisual information is broadcast to many users, each user possessing a decoder or receiver / decoder capable of descrambling the transmitted program to view it immediately. [0003] The scrambling of the data is usually performed by the multiplexer which is also responsible for assembling the transmitted data transport stream. The multiplexer receives the digital video, audio or other digital data and assembles a single stream of transport packets. Each data packet in a transport stream is usually of predetermined length and contains a header and a payload. [0004] The packet header co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/2347H04H20/00H04L9/08H04N7/167H04N7/24H04N7/52
CPCH04N21/23611H04N7/1675H04N21/23614H04N21/235H04N21/435H04N21/4348H04N21/23608H04N21/23895H04N21/26606H04N21/26613H04N21/2347
Inventor L·特兰查尔德C·德克莱克
Owner 纳格拉法国两合公司