Two-Wire Synchronous Data Network for Vehicle Content Protection
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Solution Overview
Problem
Existing communication systems in vehicles face challenges with thick and heavy cable bundles due to the increasing number of components, requiring efficient methods to transmit signals between electronic components without the need for additional ground or voltage source lines.
Innovation Solution
A two-wire communication system with a master node and slave nodes, utilizing a synchronization control frame and response frame to establish a synchronous data network (SDN) for secure and efficient data transmission, including content protection for digital audio, over a daisy-chain fashion bus with no additional ground or voltage source lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more components are included in devices to increase performance, then device functionality is improved, but cable bundle complexity increases
Solution Approach 1:
The patent combines multiple signal transmission functions into a single differential pair of conductors. The communication system transmits both data and synchronization signals over the same physical medium, eliminating the need for separate dedicated cables for each function. This merging approach directly reduces cable bundle complexity while maintaining support for multiple components and functions.
Solution Approach 2:
The differential pair conductors serve multiple purposes: transmitting data, carrying synchronization information, and providing power to components along the cable. This multi-functionality allows a single cable infrastructure to support numerous components without requiring additional dedicated wiring for each function, thereby reducing overall cable bundle complexity.
2Reliability
If traditional communication systems are used with multiple ground and voltage source lines, then signal transmission reliability is maintained, but cable weight and volume increase
Solution Approach 1:
The patent merges power delivery and data transmission functions into the same differential pair conductors. The communication system provides power to components along the cable while simultaneously transmitting synchronization and data signals, eliminating the need for separate power and ground lines. This integration directly reduces cable weight and volume while maintaining reliable signal transmission through differential signaling that rejects common-mode noise.
3Reliability
If content protection measures are implemented for digital media transmission, then security is improved, but system complexity increases
Solution Approach 1:
The patent introduces a content protection module that acts as an intermediary between the data source and receiving devices. This module implements HDCP-compliant protection by encrypting digital audio signals and managing authentication keys. The intermediary approach centralizes security functions in a dedicated module rather than distributing complex security logic throughout the entire system, thereby improving content security while managing system complexity.
Data Source
AI summary
Disclosed herein are systems and techniques for content protection over synchronous data networks. For example, a method of communicating content protected data may include providing link synchronization information over a link of a synchronous bus, and providing content protected data over the link of the synchronous bus. The content protected data may be protected in accordance with the High-Bandwidth Digital Content Protection (HDCP) specification or the Digital Transmission Content Protection (DTCP) specification, for example.