Real-Time Audio Watermarking for Playback Source Tracing
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Solution Overview
Problem
Existing audio watermarking technologies are ineffective for real-time application in live streaming scenarios, such as remote audio and video conferences, leading to unauthorized recording and dissemination of confidential information.
Innovation Solution
A method for embedding an audio watermark in real-time by a playback terminal, determining target frames based on preset conditions, and adjusting energy ratios to ensure accurate watermarking and parsing, even with varying sampling rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If audio watermarking is performed offline in a later stage, then watermark embedding accuracy is improved, but real-time processing capability deteriorates
Solution Approach 1:
The patent performs watermark embedding in advance during the audio playback process rather than offline after recording. The playback terminal embeds the watermark into the audio stream in real-time as it plays, so that when the audio is subsequently recorded by another device, the watermark is already present. This preliminary action during playback resolves the contradiction by achieving both real-time processing and accurate watermark embedding.
2Reliability
If watermark embedding is performed in real-time during playback, then source tracing capability is improved, but audio quality deterioration increases
Solution Approach 1:
The patent embeds the watermark only in specific target frames selected based on preset conditions (such as frames with sufficient energy or specific temporal characteristics) rather than in every frame. This local quality approach ensures that watermark embedding occurs only where it will be effective, minimizing the impact on overall audio quality while maintaining source tracing capability.
Solution Approach 2:
The patent adjusts embedding parameters dynamically based on the characteristics of each target frame. By changing embedding strength, frequency, or other parameters according to the local audio characteristics, the system maintains reliable source tracing while adapting to preserve audio quality in different segments of the audio stream.
3Measurement precision
If target frames are selected based on complex preset conditions, then watermark embedding accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent divides the audio stream into discrete frames and applies preset conditions to select target frames for watermark embedding. By segmenting the continuous audio stream into manageable frames and applying simple conditional rules to each frame independently, the system achieves accurate target frame selection without requiring complex global processing.
Data Source
AI summary
An audio watermark addition method carried out on a playback terminal is described. The playback terminal obtains first audio in real time and embeds an audio watermark within the first audio. The audio watermark is associated with the playback terminal, and the playback terminal plays the first audio including the embedded audio watermark.