Integrated Cable Tuner and MoCA Subsystem on Single IC
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Solution Overview
Problem
Previous cable set-top box implementations lack integrated tuners and require separate networks for home networking, such as Ethernet or external MoCA systems, which increases the form factor and complexity of the device.
Innovation Solution
A high-definition cable set-top box system with integrated cable tuners and MoCA subsystem on a single integrated circuit, allowing for home networking over existing coaxial cables without the need for additional networks, and incorporating advanced video and audio decoding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate Ethernet or external MoCA systems are used for home networking, then networking functionality is provided, but device form factor and complexity increase
Solution Approach 1:
The patent combines the cable tuner and MoCA subsystem into a single integrated circuit. The MoCA subsystem uses the same coaxial cable infrastructure as the cable tuner, merging two functions (cable reception and home networking) into one integrated device, eliminating the need for separate Ethernet or external MoCA systems
Solution Approach 2:
The integrated circuit performs multiple functions: it receives cable signals via the tuner and simultaneously provides home networking via the MoCA subsystem over the same coaxial cable infrastructure. This multi-functionality reduces the need for separate dedicated devices for each function
2Adaptability or versatility
If separate Ethernet or external MoCA systems are used for home networking, then networking functionality is provided, but form factor increases
Solution Approach 1:
The patent merges the cable tuner and MoCA subsystem into a single integrated circuit, allowing both cable reception and home networking to coexist in the same physical device without requiring additional space for separate networking equipment
3Adaptability or versatility
If code is made accessible to multiple subsystems, then functionality is improved, but security is compromised
Solution Approach 1:
The patent implements different access permissions for different subsystems. The DOCSIS subsystem has restricted access to only its own code and data in separate memory spaces, while the video processor can access video processing code. This localized access control allows each subsystem to have the minimum necessary permissions for its function while maintaining overall system security
Data Source
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AI summary
A cable set-top box system with integrated cable tuners and MoCA may implemented on a single integrated circuit, supporting communication over a shared coaxial cable line. The system may include a memory interface shared by DOCSIS and video/audio subsystems. The system may further include an embedded processor in the MoCA subsystem, enabling autonomous operation of the MoCA subsystem and secure flash memory that is not directly accessible by the DOCSIS subsystem.