Audio Sub-Band Processing for Noise and Echo Reduction
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Solution Overview
Problem
Audio communication systems face challenges in efficiently processing audio signals in noisy environments, particularly in voice recognition and hands-free voice communication systems, due to high computational complexity and interference from noise and echo.
Innovation Solution
A signal processing system divides audio signals into sub-band signals, excises a portion of them to reduce processing complexity, and then reconstructs and synthesizes the remaining signals to enhance audio quality, using filters like Wiener and echo compensation filters to attenuate noise and echo.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If audio signals are processed to remove noise and echo components, then audio signal quality is improved, but computational complexity and processing time increase
Solution Approach 1:
The patent applies segmentation by dividing the audio signal into multiple sub-bands using a filter bank. This allows the system to process different frequency components separately, reducing the computational complexity for each sub-band while maintaining overall signal quality. The filter bank transforms the full-band signal into narrower frequency bands that can be processed more efficiently.
Solution Approach 2:
The patent implements local quality by applying different processing strategies to different sub-bands based on their specific characteristics. Each sub-band can have tailored echo compensation and noise reduction parameters optimized for its frequency range, allowing efficient processing that adapts to the local requirements of each frequency component rather than applying uniform processing across the entire spectrum.
2Reliability
If echo compensation and noise reduction processing is applied to audio signals, then communication quality is improved, but processing time increases
Solution Approach 1:
The patent segments the audio signal into sub-bands, which reduces the processing time for echo compensation and noise reduction. By working with smaller, frequency-specific segments rather than the complete audio signal, the computational operations can be performed more quickly while still addressing the temporal and spectral characteristics of echo and noise effectively.
Solution Approach 2:
The patent applies partial action by selectively processing only the necessary sub-bands and applying echo compensation filters to specific frequency components where they are most needed. This partial processing approach reduces overall processing time while maintaining communication quality by focusing computational resources on the most critical frequency ranges.
Data Source
AI summary
A signal processing system enhances an audio signal. The audio signal is divided into audio sub-band signals. Some audio sub-band signals are excised. Other audio sub-band signals are processed to obtain enhanced audio sub-band signals. At least a portion of the excised audio sub-band signals are reconstructed. The reconstructed audio sub-band signals are synthesized with the enhanced audio sub-band signals to form an enhanced audio signal.