Stereo Audio Coding Mode Switching for Phase-Dependent Downmix
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Solution Overview
Problem
Conventional time-domain stereo encoding technologies experience a decrease in encoding quality due to energy loss in primary signals, particularly when the energy of the primary signal is extremely small or missing, leading to inefficiencies in encoding and decoding processes.
Innovation Solution
A method for determining an audio coding/decoding mode by analyzing channel combination schemes and switching between correlated and anticorrelated signal channel combinations, utilizing time-domain downmix processing to adapt to varying phase relationships between left and right channel signals, thereby enhancing encoding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional time-domain stereo encoding technology is used, then encoding delay is reduced, but encoding quality decreases due to energy loss in primary signals
Solution Approach 1:
The patent dynamically switches between different channel combination schemes (correlated and anticorrelated) based on the phase relationship between left and right channel signals. This dynamic adaptation allows the system to maintain optimal encoding quality across varying signal conditions while preserving the low delay characteristics of time-domain processing.
Solution Approach 2:
The patent changes the channel combination parameter (correlated vs. anticorrelated) based on the phase relationship of the input signals. By adjusting this parameter according to signal characteristics, the system optimizes energy distribution in the primary signal and prevents energy loss, thereby improving encoding quality without increasing delay.
2Device complexity
If a single channel combination scheme is used, then device complexity is reduced, but adaptability to different phase relationships deteriorates
Solution Approach 1:
The system implements dynamic selection between correlated and anticorrelated channel combination schemes based on real-time analysis of the phase relationship between left and right channel signals. This dynamic approach enhances adaptability to different phase conditions while maintaining relatively simple device complexity through straightforward switching logic.
Solution Approach 2:
The system automatically determines the appropriate channel combination scheme by analyzing the phase relationship of the input signals itself, without requiring external control or complex configuration. This self-service mechanism improves adaptability while keeping the system simple to operate and control.
Data Source
AI summary
A method for determining an audio coding mode and a related apparatus are provided. The method may include: determining a channel combination scheme for a current frame, where the determined channel combination scheme for the current frame is one of a plurality of channel combination schemes; and determining a coding mode of the current frame based on a channel combination scheme for a previous frame and the channel combination scheme for the current frame, where the coding mode of the current frame is one of a plurality of coding modes. The technical solutions provided in embodiments of this application help improve encoding quality.