Audio Bitstream Decoding With Selective Extension Signal Parsing
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Solution Overview
Problem
Decoding an extension signal unconditionally increases complexity and operational load, and existing methods struggle to decode audio signals from random timing points due to fixed header information in bit streams.
Innovation Solution
A method and apparatus that selectively decode the extension signal using length information, allowing for efficient processing and reproduction of audio signals from random timing points by skipping unnecessary decoding and utilizing adaptive bit assignment based on signal length and sync information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the decoder performs decoding on an extension signal unconditionally, then sound quality is improved, but complexity and operational load are increased
Solution Approach 1:
The patent implements dynamic decoding by making the extension signal decoding process conditional rather than fixed. The decoder dynamically adjusts whether to decode the extension signal based on runtime conditions such as the presence of length information and decoding capability flags, allowing the system to adapt between high-quality and low-complexity modes as needed
Solution Approach 2:
The patent changes the parameter of decoding execution from a constant true value to a variable condition. By introducing conditional parameters (length information presence, decoding capability flags), the system can modify its behavior to balance sound quality and operational load based on specific conditions
2Device complexity
If header information is inserted in the bit stream once only, then bit stream structure is simplified, but decoding from random timing points becomes impossible
Solution Approach 1:
The patent prepares the bit stream in advance by inserting length information and synchronization markers at predetermined positions before decoding occurs. This preliminary structuring enables random access decoding without requiring complex header repetition, as the length information allows the decoder to jump directly to the correct position in the bit stream
Solution Approach 2:
The patent introduces length information as an intermediary element between the header and the extension signal data. This intermediary provides the necessary structural guidance for random access decoding while maintaining a simplified overall bit stream structure, acting as a bridge that enables both simplicity and accessibility
Data Source
AI summary
A method for processing an audio signal, comprising the steps of extracting an ancillary signal for generating the audio signal and an extension signal included in the ancillary signal from a received bit stream, checking a level of the bit stream, selectively decoding the extension signal according to the level of the bit stream, and generating the audio signal using the ancillary signal. Accordingly, in case of processing the audio signal by the present invention, it is able to reduce a corresponding load of operation to enable efficient processing and enhance a sound quality.