Layered Signal Encoding for Low-Bitrate Decoding Quality
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Solution Overview
Problem
Existing encoding methods, such as traditional ADPCM, result in poor decoding quality when decoders support only low bit rates or receive signals due to insufficient network bandwidth and poor transmission quality, leading to degraded signal quality.
Innovation Solution
An encoding method that generates a core layer and an enhancement layer by comparing residuals with encoding thresholds, allowing for improved decoding quality by writing both layers into a bitstream, even under low bit rate conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional ADPCM encoding method is used with added coded bits, then encoding quality is improved, but decoding quality deteriorates when decoder supports only low bit rate
Solution Approach 1:
The encoding method segments the encoded signal into two distinct layers: a core layer that ensures basic decoding quality at low bit rates, and an enhancement layer that improves quality when bandwidth permits. This segmentation allows the decoder to function effectively at low bit rates while still enabling high quality when resources are available.
Solution Approach 2:
The patent changes the parameter structure by encoding residuals (differences between original and core-encoded signals) rather than the full signal. This parameter transformation allows the enhancement layer to provide quality improvements with minimal additional bandwidth, resolving the contradiction between encoding quality and low bit-rate decoding performance.
2Manufacturing precision
If coded bits are added to improve signal quality, then encoding precision is improved, but network bandwidth requirements increase
Solution Approach 1:
The enhancement layer implements partial action by encoding only the residual information that is not captured by the core layer. This approach provides quality improvement with minimal additional bandwidth consumption, encoding only what is necessary to bridge the gap between low bit-rate and high quality requirements.
Solution Approach 2:
By transforming the encoding approach to work with residuals rather than full signals, the patent achieves quality improvement with significantly reduced bandwidth requirements. The parameter change allows the same quality enhancement to be achieved with fraction of the original bandwidth overhead.
3Device complexity
If traditional encoding is used without enhancement layer, then device complexity is reduced, but decoding quality under low bit rate conditions deteriorates
Solution Approach 1:
The segmentation into core and enhancement layers allows the encoder to maintain relatively simple core encoding logic while adding a separate, manageable enhancement component. The core layer handles the bulk of the encoding task with simple algorithms, while the enhancement layer adds complexity only where needed for quality improvement.
Solution Approach 2:
The residual signal acts as an intermediary between the simple core encoding and the desired high quality output. By encoding this intermediate representation rather than the full signal, the system achieves improved decoding quality without proportionally increasing overall encoding complexity.
Data Source
AI summary
The present invention relates to information processing technologies and discloses an encoding and decoding method and device to solve the poor decoding quality problem. The technical solution of the present invention includes: encoding each sample of an input signal to generate an encoded signal of a core layer; comparing residuals of all or a part of the samples of the input signal with encoding thresholds, where the residuals are generated by core layer encoding, and performing encoding according to comparison results to generate an encoded signal of an enhancement layer; and writing the encoded signal of the core layer and the encoded signal of the enhancement layer into a bitstream to generate an encoded signal of the input signal.