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 header presence and bit stream levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the decoder unconditionally decodes the extension signal, then the sound quality is improved, but the complexity and operational load are increased
Solution Approach 1:
The patent applies partial action by selectively decoding only the necessary portion of the extension signal based on its length. Instead of unconditionally decoding the entire extension signal, the decoder reads the length information first and decodes only up to that length, thereby improving sound quality when needed while avoiding unnecessary computational load and complexity when the extension signal is short or unnecessary.
2Device complexity
If the header information is inserted once in the bit stream, then the bit stream structure is simplified, but the audio signal cannot be decoded from random timing points
Solution Approach 1:
The patent applies preliminary action by inserting header information at multiple predetermined positions within the bit stream in advance. This allows the decoder to find and use the most recent header information when accessing the bit stream from any random timing point, enabling random access capability while maintaining a relatively simple bit stream structure compared to having headers in every frame.
3Measurement precision
If the extension signal is fully decoded, then the sound quality enhancement is maximized, but the operational load and processing time are increased
Solution Approach 1:
The patent applies partial action by decoding only the necessary portion of the extension signal based on its length information rather than fully decoding the entire extension signal. This reduces processing time and operational load while still achieving sufficient sound quality enhancement for the actual content present in the bit stream.
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, reading length information of the extension signal from an extension area of the ancillary signal, 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.