Segmented Time-Domain Stereo Encoding for Smooth Scheme Transitions
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Solution Overview
Problem
Conventional time-domain stereo encoding technologies suffer from energy loss in primary signals, leading to decreased encoding quality, particularly when there are changes in channel combination schemes between frames.
Innovation Solution
A segmented time-domain encoding and decoding method that adapts channel combination schemes by dividing left and right channel signals into segments, applying different downmix and upmix processing based on the current and previous frame's schemes to maintain smooth transitions and improve encoding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional time-domain stereo encoding is used with single-frame channel combination schemes, then encoding simplicity is maintained, but encoding quality deteriorates due to energy loss when channel schemes change between frames
Solution Approach 1:
The current frame is divided into multiple segments (first segment, second segment, third segment) with different channel combination schemes applied to each segment. This segmentation allows the encoder to adapt to signal characteristics changes within the frame, preventing energy loss that would occur with a single uniform scheme applied to the entire frame.
Solution Approach 2:
The channel combination scheme is made dynamic by switching between different schemes (first scheme, second scheme, third scheme) based on the segment position and signal characteristics. This dynamic adaptation allows the encoding process to respond to changes in the audio signal, maintaining quality while managing complexity through rule-based transitions.
2Manufacturing precision
If channel combination schemes are changed between frames to adapt to signal characteristics, then encoding quality improves, but transition smoothness deteriorates due to abrupt changes
Solution Approach 1:
The channel combination scheme for the current frame is determined in advance based on the scheme used in the previous frame and the characteristics of the current frame. This preliminary determination ensures that transitions between different channel schemes are planned and controlled, preventing abrupt changes that would disrupt the audio signal while still allowing quality improvements through adaptation.
3Loss of energy
If segmented time-domain downmix processing is applied, then energy loss is reduced and encoding quality improves, but computational complexity increases
Solution Approach 1:
Different channel combination schemes (first scheme, second scheme, third scheme) are applied to different segments of the current frame based on local signal characteristics. This local quality approach ensures that each segment is processed with the most appropriate scheme for its specific characteristics, minimizing energy loss in each segment while maintaining overall manageability through structured segmentation.
Data Source
AI summary
An audio encoding and decoding method and a related apparatus are provided. The audio encoding method includes: determining a channel combination scheme for a current frame; when the channel combination scheme for the current frame is different from a channel combination scheme for a previous frame, performing segmented time-domain downmix processing on left and right channel signals in the current frame based on the channel combination scheme for the current frame and the channel combination scheme for the previous frame, to obtain a primary channel signal and a secondary channel signal in the current frame; and encoding the obtained primary channel signal and secondary channel signal in the current frame.