Stereo Audio Tag Insertion Using Azimuth-Based Energy Distribution
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Solution Overview
Problem
Existing broadcasting services face challenges in simultaneously providing content copyright identification and search services without requiring additional bandwidth, and inappropriately converting or transmitting information due to various media and content formats.
Innovation Solution
A method and apparatus for inserting and extracting tag information into a stereo audio signal using valid azimuths based on energy distribution, allowing for the modulation and demodulation of control and tag information using DQPSK-OFDM schemes, enabling the provision of additional services like content copyright identification, copy control, and event search without bandwidth overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional services like copyright identification and content search are provided through broadcasting service, then service functionality is improved, but bandwidth requirement increases
Solution Approach 1:
The patent merges the transmission of additional service information (copyright identification, content search) with the existing stereo audio signal by embedding tags into the audio signal's frequency spectrum. This combines multiple functions into a single transmission channel, eliminating the need for separate bandwidth allocation for additional services.
Solution Approach 2:
The patent utilizes the frequency dimension of the audio signal to embed additional information. By transforming the audio signal into the frequency domain and placing tags in specific frequency bands, the system adds information capacity without increasing temporal or spectral bandwidth requirements.
2Adaptability or versatility
If tag information is inserted into stereo audio signal, then additional service provision is enabled, but signal distortion may occur
Solution Approach 1:
The patent applies local quality by selectively placing tag information in specific frequency bands that have lower energy content in the original audio signal. This ensures that the embedded tags do not significantly interfere with the original audio quality, as the modification is localized to frequency regions with minimal impact on perceived sound quality.
Solution Approach 2:
The patent changes the parameter domain from time to frequency by applying spectral analysis and transformation. This parameter change allows tag information to be embedded in the frequency spectrum rather than modifying the time-domain audio signal directly, thereby maintaining audio quality while adding information capacity.
3Adaptability or versatility
If multiple media formats are supported in broadcasting services, then adaptability is improved, but information conversion accuracy deteriorates
Solution Approach 1:
The patent creates a universal tagging mechanism that works across different media formats by embedding tags in the frequency spectrum of audio signals. This universal approach allows the same tag embedding and extraction process to be applied to various media types without requiring format-specific conversion, thereby maintaining accuracy across formats.
Data Source
AI summary
Provided is a tag insertion method performed by an apparatus for inserting a tag into a stereo audio signal, the method including receiving an original stereo audio signal, analyzing an energy distribution of the original stereo audio signal based on an azimuth, determining valid azimuths for control information and for a plurality of pieces of tag information based on the energy distribution, wherein the control information is used to control tag information, modulating the plurality of pieces of tag information and the control information generated based on the valid azimuths, generating a left signal and a right signal based on the modulated control information and the plurality of pieces of modulated tag information, and generating a multi-tagged stereo audio signal by mixing the generated left signal and the generated right signal with the original stereo audio signal.