Stereo Audio Decoding Using Monaural Signal Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In cases where communication is performed by terminals connected to two lines with different priorities, or where monaural and stereo encoding/decoding methods are used independently, the information from the monaural code is not utilized in obtaining the stereo decoded sound signal, leading to inefficiencies.
Innovation Solution
A sound signal purification method that utilizes monaural and stereo decoded signals to improve the stereo decoded sound signal by estimating a common signal, applying purification and upmixing processes to enhance the decoded sound signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent monaural and stereo decoding methods are used, then decoding simplicity is maintained, but information from the monaural code is not utilized in obtaining the stereo decoded sound signal
Solution Approach 1:
The patent merges the monaural decoded sound signal and the stereo decoded sound signal through a signal combination process. The monaural decoded signal is distributed to both left and right channels, and then combined with the respective stereo decoded channel signals using combination coefficients to produce enhanced stereo output signals, thereby utilizing information from both decoding paths.
Solution Approach 2:
The monaural decoded sound signal serves multiple functions: it is distributed to both left and right channels, combined with stereo decoded signals, and used to enhance the overall stereo output. This multi-functional use maximizes the utility of the monaural decoding path while maintaining system simplicity.
2Productivity
If scalable encoding/decoding method is used with priority-based packet transmission, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the audio signal into monaural and stereo components that can be independently decoded. The monaural code is decoded first to provide a baseline signal, while the stereo code provides additional spatial information. This segmentation allows flexible combination based on packet arrival without requiring complex integrated decoding.
Solution Approach 2:
The monaural decoded sound signal is prepared in advance and can be immediately used when received, providing a fallback or enhancement option regardless of whether stereo packets arrive. This preliminary preparation of the monaural signal simplifies the real-time processing requirements.
3Device complexity
If only stereo code is used for stereo decoding, then decoding process is simplified, but sound quality is reduced
Solution Approach 1:
The patent combines the monaural decoded sound signal with the stereo decoded sound signal using weighted combination coefficients. The monaural signal is distributed to both channels and merged with the stereo signals, effectively enhancing sound quality by utilizing additional information from the monaural decoding path without significantly increasing decoding complexity.
Data Source
AI summary
There is provided a technology that improves, in a case where there is a sound signal obtained from a different code that is different from a code from which a decoded sound signal is obtained and that is derived from the same sound signal, the decoded sound signal by using the sound signal obtained from the different code. A signal (hereinafter, referred to as a decoded sound common signal) obtained by downmixing a decoded sound signal of each channel is subjected to signal purification using a monaural decoded sound signal to thereby generate a purified common signal, and in each channel, a signal obtained by upmixing the decoded sound common signal is subtracted from the decoded sound signal and a signal obtained by upmixing the purified common signal is added thereto, to thereby generate a purified decoded sound signal.