HDMI CEC Error Detection Using Register and FIFO Analysis

The patent implements a feedback mechanism where the sink device sends CEC commands to source devices and monitors their responses. By analyzing whether source devices properly respond to CEC commands (such as power on/off, volume control, etc.), the system can identify which devices have protocol implementation issues. This feedback loop enables the sink device to detect and report CEC errors to users, resolving the contradiction by maintaining protocol diversity while improving signal identification reliability through active monitoring and error reporting.

The patent enables the sink device to autonomously perform CEC error identification and analysis without requiring external intervention or complex user diagnostics. The processing circuitry automatically monitors CEC command responses from source devices, identifies errors based on predefined criteria, and presents troubleshooting information to users. This self-service approach improves ease of operation by eliminating the need for users to manually diagnose CEC issues, while the automation of these functions prevents excessive increase in device complexity.

The patent implements periodic CEC monitoring where the sink device sends CEC commands to source devices at scheduled intervals rather than continuously. The processing circuitry monitors CEC communication status periodically, analyzing responses to commands such as power state changes, volume adjustments, and device identification. This periodic action maintains CEC communication reliability by regularly detecting errors, while reducing energy consumption and processing load compared to continuous monitoring. The system can adjust monitoring frequency based on system state and error history.