Audio Signal Delay Compensation for Downmix Synchronization
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Solution Overview
Problem
In multi-channel audio systems, time delays during signal processing can cause degradation in audio quality due to mismatches in time synchronization between downmix signals and spatial information across different domains.
Innovation Solution
The solution involves compensating for time synchronization differences by delaying either the downmix signal or the spatial information, using a downmix coding identifier to determine the appropriate decoding scheme and domain conversion, ensuring that the signals are synchronized in the encoding domain, thereby maintaining audio quality during decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downmix signal processing (time-to-frequency domain conversions) is performed, then audio coding efficiency is improved, but time delays occur causing time synchronization mismatch between downmix signals and spatial parameters
Solution Approach 1:
The patent applies preliminary action by calculating and storing time delay values before the actual audio coding process. The system pre-determines the time delays introduced by different decoding schemes and downmix configurations, then uses these pre-calculated values to compensate for synchronization issues during real-time processing, ensuring that spatial parameters remain time-synchronized with downmix signals despite domain conversions
Solution Approach 2:
The patent changes parameters by adjusting time delay values based on the selected decoding scheme and downmix configuration. The system dynamically modifies the time delay parameter applied to spatial parameters depending on whether a time domain or frequency domain decoding scheme is used, and depending on the downmix type (e.g., HS, MS, LS), thereby maintaining time synchronization across different processing conditions
2Adaptability or versatility
If multiple decoding schemes are supported, then system adaptability is improved, but time synchronization complexity increases due to different processing paths
Solution Approach 1:
The system performs preliminary classification of the downmix signal to identify the type of downmix (HS, MS, LS) and pre-determines the appropriate time delay compensation based on the selected decoding scheme. This preliminary identification simplifies the subsequent processing by establishing the correct processing path before actual decoding occurs
Solution Approach 2:
The patent implements dynamic adaptation by automatically selecting different time delay compensation strategies based on the detected downmix type and chosen decoding scheme. The system dynamically adjusts its processing approach - applying specific time delays for time domain schemes versus frequency domain schemes - thereby managing complexity through adaptive rather than static processing
Data Source
AI summary
The disclosed embodiments include systems, methods, apparatuses, and computer-readable mediums for compensating one or more signals and/or one or more parameters for time delays in one or more signal processing paths.