Audio Video Offset Detector Using Fingerprint Timestamps
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Solution Overview
Problem
Existing video transmission systems face challenges in accurately measuring and correcting temporal offsets between video and audio media content, leading to A/V sync errors or lip sync issues that can go unnoticed until they cause viewer discomfort and operational problems.
Innovation Solution
The system measures temporal offsets by extracting and matching video and audio fingerprints before and after transmission, using associated time stamps to calculate video and audio time stamp offsets, and then determining a temporal offset value to adjust synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If video and audio content pass through separate media channels and processing elements, then processing operations can be performed independently on each media type, but temporal offset between video and audio content occurs
Solution Approach 1:
The system extracts fingerprints from both video and audio content, compares their arrival times, and uses this feedback information to calculate and apply compensation delays. This closed-loop feedback mechanism ensures that independent processing can continue while synchronization accuracy is maintained through continuous monitoring and adjustment.
Solution Approach 2:
The patent introduces fingerprint extraction and comparison as an intermediary mechanism between the separate video and audio processing channels. This intermediary system measures the temporal offset and enables synchronization correction without interfering with the independent processing operations of each media type.
2Measurement precision
If temporal offset measurement systems are implemented, then A/V sync errors can be detected and corrected, but system complexity increases
Solution Approach 1:
The system creates simplified representations (fingerprints) of the video and audio content that capture essential timing information without requiring analysis of the complete media streams. These fingerprint copies enable precise temporal offset measurement while avoiding the complexity of processing full-resolution video and audio data.
Solution Approach 2:
The patent extracts only the necessary timing information from the video and audio content through fingerprint extraction, separating the measurement function from the main processing channels. This extraction approach achieves high measurement precision while keeping the system complexity manageable by focusing only on essential synchronization data.
3Measurement precision
If fingerprint extraction and matching is performed for both video and audio content, then accurate temporal offset measurement is achieved, but processing time and computational resources increase
Solution Approach 1:
The system creates simplified fingerprint representations that capture timing information in a compact form, enabling rapid comparison and matching operations. These copied representations allow accurate temporal offset measurement without requiring intensive processing of the complete video and audio content.
Solution Approach 2:
The patent transforms the complex video and audio content into simplified fingerprint parameters that retain essential timing information. This parameter transformation reduces the computational complexity and processing time required for temporal offset measurement while maintaining measurement accuracy.
Data Source
AI summary
Systems and methods of measuring a temporal offset between audio content and video content that employ audio fingerprints from an audio signal in the audio content, and video fingerprints from video frames in the video content. The systems obtain reference audio and video fingerprints prior to transmission of video over a media channel, and obtain target audio and video fingerprints subsequent to transmission of the video over the media channel. Each fingerprint has an associated time stamp. Using the reference and target audio fingerprints and their associated time stamps, the systems determine an audio time stamp offset. Using the reference and target video fingerprints and their associated time stamps, the systems determine a video time stamp offset. Using the audio and video time stamp offsets, the systems determine a temporal offset between the video content and the audio content introduced by the media channel.