Restricted Reception Device for Digital Cable Broadcasting
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Solution Overview
Problem
The digital cable broadcasting system of the OpenCable standard faces challenges in implementing restricted reception due to differences in data transmission systems compared to the MPEG-2 standard, particularly with the DVS-167 and DOCSIS systems, which transmit data in forms other than MPEG-2 TS, making it difficult to extract and process EMM data for restricted reception.
Innovation Solution
A restricted reception device and method that includes a demultiplexer for in-band channel data, an out-of-band channel signal processor, a restricted reception processor, and a remultiplexer to selectively receive and descramble broadcasting data using ECM and EMM data, with a TS processing module, ECM memory, EMM memory, key matrix module, and descrambling module to generate and apply decoding keys for descrambling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MPEG-2 restricted reception system is used for cable broadcasting, then restricted reception can be implemented, but the system becomes inapplicable because ECM and EMM are transferred on different channels with different transmission formats (DVS-167/DOCSIS)
Solution Approach 1:
The patent divides the restricted reception processing into separate functional modules: an in-band channel processor for ECM extraction and an out-of-band channel processor for EMM extraction. This segmentation allows each module to handle specific transmission formats independently, enabling the system to work with both MPEG-2 TS and DVS-167/DOCSIS formats without requiring a complete system redesign.
Solution Approach 2:
The patent introduces a universal restricted reception processor that acts as an intermediary between the different transmission formats (MPEG-2 TS, DVS-167, DOCSIS) and the final descrambling function. This intermediary component abstracts the format differences and provides a unified interface for ECM and EMM processing, making the system adaptable to various transmission standards.
2Productivity
If EMM data is extracted from out-of-band channels using DVS-167 or DOCSIS transmission, then efficient subscriber control is achieved, but the extraction and processing becomes complex due to non-MPEG-2 TS data formats
Solution Approach 1:
The patent changes the processing parameters and methods for EMM extraction based on the transmission format. For DVS-167/DOCSIS channels, the system uses format-specific extraction parameters and algorithms, while maintaining compatibility with MPEG-2 TS channels. This parameter adaptation allows efficient EMM extraction without requiring a completely different processing system for each format.
Solution Approach 2:
The patent implements a dynamic EMM processing system that automatically detects the transmission format and adjusts its processing methods accordingly. The out-of-band channel signal processor dynamically switches between different extraction and processing techniques based on the detected channel type (DVS-167, DOCSIS, or MPEG-2 TS), optimizing performance for each format while maintaining a unified interface.
3Adaptability or versatility
If channel/program guide information and auxiliary data are transferred on out-of-band channels, then bi-directional communication is enabled, but restricted reception processing becomes more complex due to multiple data types and formats
Solution Approach 1:
The patent segments the data processing functions into distinct modules: an in-band channel processor for broadcasting data and ECM, and an out-of-band channel processor for auxiliary data, EMM, and bi-directional communication. This segmentation allows each module to specialize in specific data types and formats, reducing the overall processing complexity while maintaining versatility.
Solution Approach 2:
The patent creates a universal restricted reception processor that can handle multiple data types (ECM, EMM, channel guide information) and transmission formats (MPEG-2 TS, DVS-167, DOCSIS) through a unified interface. This multi-functional design enables the system to process diverse data from out-of-band channels without requiring separate processing paths for each data type, thereby reducing complexity while maintaining adaptability.
Data Source
AI summary
A restricted reception device enabling a subscriber receiver to selectively receive broadcasting data transferred via a digital cable broadcasting network, includes: a demultiplexer for receiving broadcasting data and an ECM including a CW from the subscriber receiver, and demultiplexing them, the broadcasting data and the ECM being transferred through an in-band channel; an out-of-band channel signal processor for receiving an EMM from the subscriber receiver, and processing the EMM, the EMM being transferred through an out-of-band channel; a restricted reception processor for descrambling the scrambled broadcasting data using the ECM and the EMM received from the out-of-band channel signal processor; and a remultiplexer for multiplexing the descrambled broadcasting data received from the restricted reception processor, and sending the multiplexed broadcasting data to the subscriber receiver.