Audio Video Synchronization via Signature Feedback Loop
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Solution Overview
Problem
Current methods for synchronizing audio and video between independent media devices are inefficient and prone to miscalibration due to variable latency in display devices, lacking an effective synchronization mechanism.
Innovation Solution
A dynamic audio/video synchronization mechanism that inserts a unique signature into the audio portion of an audio/video data stream, detects it at the display device, calculates latency, and synchronizes the audio output using a feedback loop, allowing for automatic and dynamic synchronization without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If user-adjustable audio delay settings are used in an amplifier or speaker device, then audio synchronization with video output can be achieved, but the process becomes inefficient and laborious requiring manual adjustment by eye
Solution Approach 1:
The system automatically measures display device latency and adjusts audio synchronization without user intervention. The audio device inserts a signature into the audio stream, detects it in the feedback loop from the display device, calculates the latency automatically, and adjusts the audio timing to compensate for the measured delay.
Solution Approach 2:
The system establishes a feedback loop where the audio device transmits audio to the display device, captures the audio output from the display device, detects the inserted signature, measures the round-trip latency, and uses this feedback to automatically adjust audio synchronization settings.
2Reliability
If conventional audio delay adjustment techniques are used, then some level of synchronization can be achieved, but miscalibration occurs due to variable television latency
Solution Approach 1:
The system replaces manual visual adjustment with an automated electronic measurement and control system. An electronic signature is inserted into the audio signal, detected automatically in the feedback loop, and used to precisely calculate latency without requiring human observation or mechanical adjustment mechanisms.
Solution Approach 2:
A signature signal acts as an intermediary marker inserted into the audio stream. This signature travels through the audio processing chain and display device, providing a detectable reference point that enables precise measurement of the total system latency without requiring direct comparison of audio and video signals.
3Adaptability or versatility
If separate audio and video rendering devices are used, then device independence and flexibility are maintained, but effective synchronization between the devices becomes difficult to achieve
Solution Approach 1:
The synchronization mechanism is designed to work with any display device that can process and output audio signals, making the solution universally applicable across different television and monitor types. The feedback loop approach can accommodate various audio formats and display technologies without requiring device-specific customization.
Data Source
AI summary
A mechanism for facilitating dynamic synchronization of audio and video for multiple media devices is described. In one embodiment, an apparatus includes first logic to insert a signature in an audio portion of an audio/video data stream. The signature represents uniquely identifiable data and is to be transmitted to a second media device having a display device. The apparatus may include second logic to detect the signature in the audio portion of the audio/video data stream, third logic to calculate latency of the display device using an audio output of the display device, and fourth logic to synchronize the audio output to a corresponding video display based on a feedback loop generated using the audio portion of the audio/video data stream transmitted to the display device and the audio output of the display device.