Audio Watermarking Phase Encoding for Video Sync
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Solution Overview
Problem
Existing watermarking systems for audio and video content lack temporal accuracy, which is crucial for synchronization and verification purposes, as they often rely on large data samples without considering the precise timing of the watermark location.
Innovation Solution
A temporally accurate watermarking system that utilizes embedded timing information by modifying phase differences in specific frequency bins of audio data to encode both watermarking data and timing information, ensuring synchronization with video signals without affecting the audio's audibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If watermarking is performed on large data samples without temporal accuracy consideration, then verification reliability is improved, but timing precision deteriorates
Solution Approach 1:
The patent segments the watermarking process into two distinct components: spatial watermarking embedded in frequency bins for verification, and temporal watermarking embedded in phase differences for timing. This segmentation allows each component to specialize - spatial watermarking ensures verification reliability while temporal watermarking provides timing precision, resolving the contradiction between the two requirements.
Solution Approach 2:
The patent transitions from traditional single-dimension watermarking to a two-dimensional approach by adding the temporal dimension through phase difference encoding. While conventional watermarking only modifies amplitude or frequency bins, this patent introduces phase difference as an additional dimension to encode timing information, thereby achieving both verification reliability and timing precision simultaneously.
2Measurement precision
If phase differences are modified to encode timing information, then temporal accuracy is improved, but audio signal integrity deteriorates
Solution Approach 1:
The patent applies local quality by making different parts of the audio signal serve different functions. Specifically, magnitude data in frequency bins is used for spatial watermarking while phase difference data is used for temporal watermarking. This localized functional assignment allows timing information to be extracted from phase differences without compromising the overall audio signal integrity, as each component is optimized for its specific purpose.
3Reliability
If watermarking data is embedded in frequency bins, then verification capability is improved, but synchronization capability deteriorates
Solution Approach 1:
The patent merges two previously separate watermarking approaches into a unified system. Spatial watermarking in frequency bins provides verification capability while temporal watermarking through phase differences provides synchronization capability. By combining these two watermarking methods into a single integrated system, the patent achieves both verification and synchronization capabilities simultaneously, resolving the contradiction between them.
Data Source
AI summary
A system for identifying audio data is provided. The system includes a transform system receiving left channel audio data and right channel audio data and generating a plurality of frequency bins of left channel magnitude data, left channel phase data, right channel magnitude data and right channel phase data. A watermarking system receives watermarking data and modifies predetermined frequency bins of the left channel phase data and the right channel phase data to encode the watermarking data. A magnitude system receives the left channel magnitude data and the right channel magnitude data and increases the left channel magnitude data and the right channel magnitude data for one or more of the predetermined frequency bins to a threshold level if the left channel magnitude data and the right channel magnitude data for the corresponding frequency bin is less than the threshold level.