HDCP Transmitter Enhanced Link Verification Detection

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Solution Overview

Problem

HDCP transmitters struggle to quickly detect synchronization loss in receivers that support Enhanced Link Verification but do not indicate this through the 1.1_FEATURES bit, leading to delayed corrective action for snowy picture issues.

Innovation Solution

The method involves reading a single-bit value indicative of HDCP 1.1 feature support and determining the confidence level for Enhanced Link Verification support, allowing the transmitter to use Enhanced Link Verification even if the 1.1_FEATURES bit is not set, thereby improving detection of out-of-sync conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the transmitter relies solely on the 1.1_FEATURES bit to determine Enhanced Link Verification support, then device compatibility is maintained, but synchronization loss detection speed is reduced

Engineering Contradiction:

Improvedetection accuracyVSAvoiddetection delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The transmitter performs preliminary detection by sending test packets and analyzing receiver responses to determine Enhanced Link Verification support. This preliminary action occurs before actual content transmission, allowing the system to identify capable receivers even when they don't set the 1.1_FEATURES bit, thereby enabling faster synchronization loss detection without compromising compatibility

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the transmitter sends test packets and analyzes the receiver's response packets. By examining specific fields in the response packets, the transmitter receives feedback about the receiver's actual capabilities, which then informs whether to use Enhanced Link Verification for faster synchronization monitoring

Inventive Principle:

Principle #23Feedback

2Speed

If Enhanced Link Verification is used for all receivers, then synchronization loss detection speed is improved, but interoperability with legacy receivers is compromised

Engineering Contradiction:

Improvedetection speedVSAvoidreceiver compatibility

Core Design Contradiction:

SpeedVSAdaptability or versatility

Solution Approach 1:

The system dynamically adjusts its operation mode based on receiver capability detection. The transmitter can switch between standard Link Verification and Enhanced Link Verification modes depending on the specific receiver connected. This dynamic adaptation allows the system to optimize detection speed when possible while maintaining compatibility with legacy receivers that don't support Enhanced Link Verification

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The transmitter applies different verification methods to different receivers based on their individual capabilities. Rather than using a uniform approach for all receivers, the system tailors the link verification method to each specific receiver's support level, enabling enhanced functionality where available while maintaining basic functionality universally

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9161081B2HDCP link integrity checking with detection of enhanced link verification support

Publication Date: 2015.10.13 ARRIS ENTERPRISES LLC

AI summary

A method is disclosed for checking HDCP link integrity in a High-bandwidth Digital Content Protection (HDCP) transmitter. From an HDCP receiver communicatively coupled to the HDCP transmitter by an HDCP-protected interface, a single-bit value indicative of HDCP 1.1 feature support is read. When the single-bit value is true, HDCP Enhanced Link Verification is used in the HDCP transmitter. When the single-bit value is false, the method determines whether the HDMI receiver supports HDCP Enhanced Link Verification, and if so, HDCP Enhanced Link Verification is used in the HDCP transmitter.