Sound Watermark Processing via Signal Power-Based Code Positioning
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Solution Overview
Problem
In real-time conference systems, noise interference can affect the accuracy of sound watermark identification, particularly when the signal power of program segments is low, making it difficult for receivers to correctly identify watermark-embedded sound signals.
Innovation Solution
A processing method and apparatus that dynamically adjust the arrangement of reference codes and identification codes in the sound watermark sequence based on signal power, generating an extended watermark sequence to reduce noise interference, by inserting reference codes in positions determined by signal power thresholds, thereby improving identification accuracy at the receiving end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound watermark signals are transmitted without dynamic adjustment, then the transmission process is simple, but the identification accuracy drops when signal power is low due to noise interference
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the arrangement of reference codes and identification codes in the watermark sequence based on real-time signal power levels. The system transitions from a static watermark structure to a dynamic one where code positions are adaptively determined according to signal conditions, improving identification accuracy in varying noise environments
Solution Approach 2:
The patent changes the parameter of code arrangement in the watermark sequence based on signal power parameters. By varying the position and distribution of reference codes and identification codes according to signal power levels, the system optimizes identification accuracy for different signal conditions without requiring a completely different transmission system
2Reliability
If reference codes are inserted according to fixed positions, then the watermark structure is simple, but low signal power segments remain vulnerable to noise interference
Solution Approach 1:
The patent applies local quality by inserting reference codes at specific positions within the watermark sequence where they are most needed - particularly in segments corresponding to low signal power portions of the audio signal. This localized placement of reference codes provides targeted protection against noise interference where it matters most, rather than uniformly distributing codes throughout the entire sequence
Solution Approach 2:
The patent performs preliminary action by pre-inserting reference codes into the watermark sequence before transmission, positioned according to predicted or measured signal power characteristics. This advance preparation ensures that low signal power segments have adequate reference codes available to maintain identification reliability when noise interference occurs during transmission
Data Source
AI summary
A processing method of a sound watermark and a sound watermark processing apparatus are provided. In the method, an inserted position of a reference code in an initial watermark sequence is determined according to signal power of a main sound signal to generate an extended watermark sequence. The main sound signal and the extended watermark sequence are synthesized to generate a watermark-embedded sound signal. In this way, noise interference may be overcome.