Stereo Audio Decoding With Monaural High-Frequency Compensation
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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
Compensate the high-frequency energy of the decoded sound signal using a high-frequency compensation gain based on the monaural decoded sound signal to improve the stereo decoded sound signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent monaural and stereo encoding/decoding methods are used, then decoding simplicity is improved, but information utilization efficiency deteriorates
Solution Approach 1:
The patent merges the monaural decoded sound signal and stereo decoded sound signal by adding them together to generate the final output sound signal. This combining operation allows the system to maintain decoding simplicity while effectively utilizing information from both independent decoding paths, resolving the contradiction between ease of operation and information utilization efficiency.
2Ease of operation
If only stereo code is used for stereo decoding, then decoding process simplicity is improved, but sound quality deteriorates
Solution Approach 1:
The patent combines the output from independent monaural decoding and stereo decoding through signal addition. This approach maintains the simplicity of independent decoding processes while improving sound quality by utilizing the additional information contained in the monaural decoded signal, thereby resolving the contradiction between decoding process simplicity and sound quality.
3Productivity
If scalable encoding/decoding method is used with priority-based packet transmission, then transmission efficiency is improved, but system complexity deteriorates
Solution Approach 1:
The patent employs a universal decoding approach that can handle both scalable encoding (with priority-based packet transmission) and independent encoding scenarios. By using independent monaural and stereo decoding that can be combined through addition, the system achieves multi-functionality: it works efficiently with priority-based transmission when packets are received selectively, while also effectively utilizing all available data when both packets are received, thereby resolving the contradiction between transmission efficiency and system complexity.
Data Source
AI summary
For each frame, an n-th channel compensated decoded sound signal ˜X′n is obtained that is a signal obtained by compensating a high frequency of an n-th channel purified decoded sound signal ˜Xn obtained by performing signal processing in a time domain on an n-th channel decoded sound signal {circumflex over ( )}Xn (n is each integer of 1 or more and N or less) that is a decoded sound signal of each channel of stereo obtained by decoding a stereo code CS. At this time, for the each frame with respect to the each channel, an n-th channel high-frequency compensation gain ρn that is a value for bringing high-frequency energy of the n-th channel compensated decoded sound signal ˜X′n close to high-frequency energy of the n-th channel decoded sound signal {circumflex over ( )}Xn is obtained, and for the each frame with respect to the each channel, a signal obtained by adding the n-th channel purified decoded sound signal ˜Xn and a signal obtained by multiplying a high-frequency component of the n-th channel decoded sound signal {circumflex over ( )}Xn by the n-th channel high-frequency compensation gain ρn is obtained and output as the n-th channel compensated decoded sound signal.