Bandwidth Extension Encoding Using Low Frequency Signal
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Solution Overview
Problem
Existing audio and speech signal encoding and decoding methods are complex and inefficient, particularly when dealing with the entire frequency domain, resulting in high data transmission requirements.
Innovation Solution
A method and apparatus for encoding and decoding high frequency band signals by utilizing low frequency band signals, involving band division, domain determination, and the use of CELP encoding and transformation techniques to optimize encoding and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If encoding and decoding are performed for the entire frequency domain, then complete audio signal processing is achieved, but encoding complexity increases and efficiency decreases
Solution Approach 1:
The audio signal is divided into low frequency band and high frequency band components. The low frequency band is encoded using conventional methods while the high frequency band is generated through bandwidth extension using the low frequency band as input, thereby segmenting the encoding process to reduce overall complexity and improve efficiency
2Reliability
If encoding and decoding are performed for the entire frequency domain, then complete audio signal processing is achieved, but data transmission quantity increases
Solution Approach 1:
The patent extracts only the essential low frequency band information for transmission and uses it to synthesize the high frequency band at the decoding end. This extraction approach reduces the amount of data that needs to be transmitted while maintaining audio quality through the bandwidth extension process
3Quantity of substance
If bandwidth extension is performed using low frequency band signal, then data size is reduced and efficiency is improved, but encoding process becomes more complex
Solution Approach 1:
The low frequency band signal serves multiple functions: it is transmitted as-is for the low frequency content, and simultaneously serves as the input signal for generating the high frequency band through bandwidth extension. This multi-functionality reduces data size while the complexity is managed through standardized transformation processes
Data Source
AI summary
Provided are a method, apparatus, and medium for encoding/decoding a high frequency band signal by using a low frequency band signal corresponding to an audio signal or a speech signal. Accordingly, since the high frequency band signal is encoded and decoded by using the low frequency band signal, encoding and decoding can be carried out with a small data size while avoiding deterioration of sound quality.