Audio Signal Noise Filling Omission for Bitstream Reduction
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Solution Overview
Problem
Existing audio signal processing technologies face inefficiencies when dealing with mixed audio and speech characteristics, leading to decreased coding efficiency and degraded sound quality when a single coding scheme is applied to signals containing both.
Innovation Solution
An apparatus and method that apply a noise filling scheme to compensate for signal loss during quantization, allowing for the omission of noise filling information transmission when not applied, and encoding noise level or offset based on consistent values across frames, reducing bitstream size and parsing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noise filling information is transmitted for every frame, then sound quality is maintained through compensation of quantization loss, but bitstream size increases
Solution Approach 1:
The patent extracts and transmits only the essential noise filling information (noise level and offset) rather than complete noise filling data for every frame. The decoder reconstructs the full noise filling information using this extracted data combined with previously decoded information, thereby reducing bitstream size while maintaining sound quality compensation.
Solution Approach 2:
The patent performs preliminary encoding of noise filling information by extracting key parameters (noise level and offset) before transmission. The decoder uses this pre-prepared information combined with previously decoded frame data to reconstruct the complete noise filling information when needed, avoiding the need to transmit redundant data for each frame.
2Reliability
If noise filling is applied to all frames, then sound quality is improved through loss compensation, but transmission overhead increases
Solution Approach 1:
The patent applies noise filling selectively rather than uniformly to all frames. By determining whether each frame requires noise filling based on its specific characteristics and only transmitting noise filling information when necessary, the system improves sound quality where needed while minimizing transmission overhead for frames that don't require compensation.
3Measurement precision
If complete noise filling information is transmitted for each frame, then decoding accuracy is improved, but parsing complexity increases
Solution Approach 1:
The patent uses a copying approach where the decoder reconstructs complete noise filling information by combining the transmitted essential parameters (noise level and offset) with previously decoded frame information. This creates an accurate copy of the required noise filling data without needing to transmit the complete information for each frame, thereby maintaining decoding accuracy while reducing parsing complexity.
Data Source
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AI summary
An apparatus for processing an audio signal and method thereof are disclosed, by which a method for processing an audio signal, comprising: extracting noise filling flag information indicating whether noise filling is used to a plurality of frames; extracting coding scheme information indicating whether a current frame included in the plurality of frames is coded in either a frequency domain or a time domain; when the noise filling flag information indicates that the noise filling is used to for the plurality of frames and the coding scheme information indicates that the current frame is coded in the frequency domain, extracting noise level information for the current frame; when a noise level value corresponding to the noise level information meets a predetermined level, extracting noise offset information for the current frame; and, when the noise offset information is extracted, performs the noise-filling for the current frame based on the noise level value and the noise offset information.