Real-Time Sound Watermark Embedding Using High-Frequency Sinewave Signals
Solution Overview
Problem
Existing speech processing technologies face challenges in embedding watermarks in real-time during conferences due to time-consuming embedding processes and noise distortion, which affects the recognition of the embedded watermark signals.
Innovation Solution
A method and system that generate high-frequency sinewave signals with different frequencies, map a watermark pattern into a time-frequency diagram, and synthesize these signals with speech signals in the time domain to create a watermark-embedded signal, allowing real-time embedding and reducing noise impact, particularly from pulse signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional watermark embedding process is used, then watermark can be embedded, but the embedding process takes too much time to meet real-time conference requirements
Solution Approach 1:
The patent performs watermark embedding operations in advance during audio encoding, so that the watermark is already embedded when the audio is transmitted. This eliminates the need for separate real-time embedding during conference calls, resolving the time constraint issue.
Solution Approach 2:
The patent combines the watermark embedding process with the audio encoding process into a single unified operation. By merging these two processes, the watermark is embedded efficiently without requiring separate processing time, thus achieving real-time performance.
2Reliability
If watermark is embedded in audio signal, then audio can be watermarked, but the sound signal is affected by noise and distorted after transmission making watermark difficult to recognize
Solution Approach 1:
The patent embeds the watermark in specific frequency regions of the audio spectrum where it is less susceptible to noise and distortion. By selecting optimal frequency locations for watermark placement, the recognition accuracy is maintained even under noisy transmission conditions.
Solution Approach 2:
The patent transforms the watermark embedding from the time domain to the frequency domain by mapping the watermark pattern into a time-frequency diagram. This dimensional transformation allows the watermark to be positioned in frequency regions that are more robust against noise and distortion during transmission.
Data Source
AI summary
A processing method of a sound watermark and a speech communication system are provided. Multiple sinewave signals are generated. Frequencies of the sinewave signals are different from each other, and the sinewave signals belong to a high-frequency sound signal. A watermark pattern is mapped into a time-frequency diagram, to form a watermark sound signal. Two dimensions of the watermark pattern in a two-dimensional coordinate system respectively correspond to a time axis and a frequency axis in the time-frequency diagram. Each of multiple audio frames on the time axis corresponds to the sinewave signals with different frequencies on the frequency axis. A speech signal and the watermark sound signal are synthesized in a time domain to generate a watermark-embedded signal. Accordingly, a sound watermark may be embedded in real-time.