Downmix Signal Delay Compensation Across Time-Frequency Conversion
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Solution Overview
Problem
In multi-channel audio systems, time delays during signal processing can cause synchronization issues between downmix signals and spatial information, leading to degraded audio quality.
Innovation Solution
The method involves converting downmix signals between different domains, such as time and frequency domains, and compensating for time synchronization differences by delaying either the signals or the spatial information to align them properly, using domain converting units and decoding schemes like QMF and MDCT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If downmix signal is converted between different domains (time to frequency domain), then signal processing flexibility is improved, but time delay increases causing synchronization issues
Solution Approach 1:
The patent applies preliminary action by measuring and storing the time delay amount before the actual signal combination process. The delay compensation amount is calculated and prepared in advance based on the domain conversion operation, then applied to align the downmix signal with spatial information before they are combined, preventing synchronization issues rather than correcting them afterward
Solution Approach 2:
The patent introduces an intermediary delay compensation mechanism that acts as a mediator between the domain conversion process and the final signal combination. This intermediary component measures the time delay introduced by conversion and applies compensatory delay to either the downmix signal or spatial information, ensuring they remain synchronized throughout the processing pipeline
2Measurement precision
If time delay compensation is applied to align downmix signal and spatial information, then synchronization accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent implements self-service by enabling the system to automatically measure its own time delay and apply appropriate compensation without external intervention. The delay measuring unit and delay amount determining unit operate autonomously to detect synchronization issues and correct them, reducing the need for complex external control mechanisms while maintaining high synchronization accuracy
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.