Adaptive Reverberation Suppression via Dynamic Filter Length Estimation
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Solution Overview
Problem
Existing reverberation suppression technologies face challenges in achieving high accuracy due to frame length limitations, where long frames result in prolonged processing times and short frames fail to effectively suppress reverberation.
Innovation Solution
A reverberation suppressing apparatus and method that includes a sound acquiring unit, reverberation data computing unit, reverberation characteristics estimating unit, filter length estimating unit, and reverberation suppressing unit, which estimate and adjust filter lengths based on reverberation characteristics and environmental changes to efficiently suppress reverberation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a long frame length is used for reverberation suppression, then the suppression accuracy is improved, but the processing time increases
Solution Approach 1:
The patent applies dynamics by making the frame length adaptive rather than fixed. The reverberation suppression unit dynamically adjusts the frame length based on the estimated reverberation characteristics of the acoustic environment. This allows the system to use longer frames when reverberation is strong (improving accuracy) and shorter frames when reverberation is weak (reducing processing time), thus resolving the contradiction between accuracy and processing speed.
Solution Approach 2:
The patent changes the parameter of frame length from a constant value to a variable that adapts to environmental conditions. By estimating reverberation characteristics (such as reverberation time) and adjusting the frame length accordingly, the system optimizes the balance between suppression accuracy and processing efficiency for different acoustic scenarios.
2Productivity
If a short frame length is used for reverberation suppression, then the processing time is reduced, but the reverberation suppression effectiveness deteriorates
Solution Approach 1:
The system dynamically adjusts frame length based on real-time reverberation estimation, allowing it to maintain high processing efficiency with shorter frames when reverberation is minimal while ensuring effective suppression when reverberation is present by switching to longer frames.
Solution Approach 2:
The frame length parameter is changed from a fixed value to an adaptive parameter that varies with environmental reverberation characteristics, enabling the system to optimize processing efficiency and suppression effectiveness according to actual conditions.
3Reliability
If the reverberation suppression process is performed for every predetermined frame, then the suppression coverage is improved, but the computational complexity increases
Solution Approach 1:
The patent applies preliminary action by first estimating the reverberation characteristics of the environment before performing the full reverberation suppression process. This preliminary estimation allows the system to determine appropriate processing parameters (such as frame length and suppression strength) in advance, reducing unnecessary computational operations while maintaining effective suppression coverage.
Data Source
AI summary
A reverberation suppressing apparatus, includes: a sound acquiring unit which acquires a sound signal; a reverberation data computing unit which computes reverberation data from the acquired sound signal; a reverberation characteristics estimating unit which estimates reverberation characteristics based on the computed reverberation data; a filter length estimating unit which estimates a filter length of a filter which is used to suppress a reverberation based on the estimated reverberation characteristics; and a reverberation suppressing unit which suppresses the reverberation based on the estimated filter length.