Stereo Audio Encoding With Reduced Side Information
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for encoding and decoding stereo audio require a large number of side information parameters, which increases complexity and reduces efficiency in parametric audio coding.
Innovation Solution
The method generates divided audio signals from center input signals and adds remaining input signals to create final mono audio signals, minimizing the need for side information by encoding intensity and phase differences using vector spaces and phase adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional parametric audio coding is used to encode stereo audio, then audio quality can be maintained, but the number of side information parameters increases, leading to increased complexity
Solution Approach 1:
The patent extracts and removes redundant side information parameters from the conventional parametric audio coding process. Specifically, it eliminates the need to encode separate IID and IC parameters by using a simplified intensity parameter that is derived directly from the decoded mono audio signal, thereby reducing the number of parameters to be transmitted while maintaining audio quality
Solution Approach 2:
The patent makes the intensity parameter serve multiple functions simultaneously. The same intensity parameter is used for both intensity panning law operations and for reconstructing the stereo signal, eliminating the need for separate parameters and reducing overall system complexity
2Measurement precision
If multiple side information parameters (IID, IC, OPD, IPD) are encoded for stereo audio restoration, then accurate stereo reconstruction is achieved, but the encoding complexity and data transmission requirements increase
Solution Approach 1:
The patent merges the functions of multiple separate parameters (IID, IC, OPD, IPD) into a single intensity parameter. By combining these functions and using the intensity parameter in conjunction with phase information from the original stereo signal, the patent achieves accurate stereo reconstruction with reduced encoding complexity
Solution Approach 2:
The patent uses the phase information from the original stereo signal as a copy/reference during the decoding process. Instead of encoding phase parameters separately, the system preserves and reuses the original phase information, eliminating the need for separate phase parameter encoding while maintaining reconstruction accuracy
Data Source
AI summary
A method of encoding stereo audio that minimizes a number of pieces of side information required for parametric-encoding and parametric-decoding of the stereo audio. The side information may include parameters about interchannel intensity difference (IID), interchannel correlation (IC), overall phase difference (OPD), and interchannel phase difference (IPD), which are required to restore the mono audio to the stereo audio.