Stereo Sound Decoding Using Monaural Signal Refinement
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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 on the same line, the information from the monaural code is not utilized in obtaining the stereo decoded sound signal, leading to suboptimal processing on the reception side.
Innovation Solution
A sound signal purification method that utilizes both monaural and stereo decoded signals to improve the stereo decoded sound signal by estimating a common signal and applying channel-specific weights to enhance the decoded sound signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent monaural and stereo decoding is performed, then decoding simplicity is improved, but information utilization deteriorates
Solution Approach 1:
The patent merges the independently decoded monaural signal and stereo signal by estimating a common signal from both inputs and combining it with channel-specific signals. This combining process utilizes information from both decoding paths while maintaining operational simplicity, resolving the contradiction between decoding simplicity and information utilization.
2Device complexity
If only stereo code is used for stereo decoding, then decoding process is simplified, but sound signal quality deteriorates
Solution Approach 1:
The patent creates a composite decoded signal by combining the common signal (derived from both monaural and stereo codes) with channel-specific signals. This composite approach improves sound signal quality by leveraging information from both code types while keeping the decoding process structure manageable through systematic signal combination.
3Productivity
If monaural code information is not utilized in stereo decoding, then processing efficiency is improved, but output quality deteriorates
Solution Approach 1:
The patent performs preliminary decoding of both monaural and stereo codes independently before combining their outputs. This preliminary action maintains processing efficiency by allowing parallel independent decoding, while the subsequent combination step ensures that information from both codes is utilized to improve output quality.
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, the decoded sound common signal is subtracted from the decoded sound signal and the purified common signal is added thereto, to thereby generate a purified decoded sound signal.