Audio Encoding Mode Correction to Reduce Switching Delay
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Solution Overview
Problem
Existing audio encoding methods suffer from delays and deteriorated sound quality due to frequent encoding mode switching between frequency and time domains, particularly when classifying mixed music and speech signals, and lack correction mechanisms for encoding mode errors.
Innovation Solution
An apparatus and method for determining an initial encoding mode based on audio signal characteristics, with error correction to adaptively select an appropriate encoding mode, reducing frequent switching by comparing current and previous frames over a hangover length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency domain encoding is used for music signals and time domain encoding for speech signals, then encoding efficiency is improved, but encoding mode switching causes delays and deteriorates decoded sound quality
Solution Approach 1:
The system performs preliminary classification of audio signals into music and speech categories before encoding. By determining the signal type in advance and selecting the appropriate encoding mode (frequency domain for music, time domain for speech) beforehand, the system avoids frequent mode switching during encoding, thereby reducing switching delays while maintaining encoding efficiency for different signal types
Solution Approach 2:
The system dynamically adapts the encoding mode based on the detected characteristics of the audio signal. By continuously analyzing the signal and switching encoding modes according to the detected music/speech content, the system optimizes encoding efficiency for each segment while minimizing unnecessary mode changes, thus balancing productivity with time loss
2Measurement precision
If encoding mode is determined based on audio signal characteristics, then encoding accuracy is improved, but errors in determination deteriorate reconstructed audio quality
Solution Approach 1:
The system incorporates feedback mechanisms to verify and correct encoding mode determinations. By monitoring the encoded audio quality and comparing it against expected characteristics, the system can detect determination errors and switch to alternative encoding modes if necessary, thereby maintaining high reliability of reconstructed audio quality while preserving encoding accuracy
Solution Approach 2:
The system prepares multiple encoding modes and has pre-established correction mechanisms in case of determination errors. By having backup encoding options and correction algorithms ready beforehand, the system can quickly recover from incorrect mode selections and minimize the impact on reconstructed audio quality, thus cushioning against determination errors
3Adaptability or versatility
If frequent encoding mode switching is performed to adapt to signal characteristics, then encoding adaptability is improved, but system complexity and processing overhead increase
Solution Approach 1:
The system segments the audio signal into distinct segments based on detected characteristics (music vs. speech portions). By dividing the continuous audio stream into manageable segments and applying appropriate encoding modes to each segment, the system achieves high adaptability to different signal types while managing complexity through structured segmentation rather than continuous adaptation
Data Source
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AI summary
Provided are a method and an apparatus for determining an encoding mode for improving the quality of a reconstructed audio signal. A method of determining an encoding mode includes determining one from among a plurality of encoding modes including a first encoding mode and a second encoding mode as an initial encoding mode in correspondence to characteristics of an audio signal, and if there is an error in the determination of the initial encoding mode, generating a corrected encoding mode by correcting the initial encoding mode to a third encoding mode.