Acoustic Equalization Filter Linked to Echo Compensation
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Solution Overview
Problem
Existing acoustic signal processing systems in noisy environments, such as vehicle communication systems, face challenges with noise reduction and echo compensation due to changing reverberation characteristics caused by vehicle occupants and environmental changes, leading to distorted and deteriorated sound quality.
Innovation Solution
An equalization system comprising an equalization filter and an echo compensation filter, where the equalization filter processes acoustic signals to enhance quality and the echo compensation filter adapts to dynamic changes, using filter coefficients to compensate for reflected sound, thereby improving speech intelligibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If echo compensation and equalization filters are used to improve sound quality, then speech intelligibility is improved, but the system complexity increases due to multiple filter components and their interactions
Solution Approach 1:
The patent combines the equalization filter and echo compensation filter into a single integrated system where the equalization filter characteristics are derived from the echo compensation filter characteristics. This merging approach maintains speech intelligibility while reducing overall system complexity by eliminating the need for separate, independently configured filters.
Solution Approach 2:
The echo compensation filter serves dual purposes: it performs echo compensation and simultaneously provides the basis for equalization filtering. This multi-functionality reduces the number of separate components needed, thereby reducing system complexity while maintaining both echo compensation and sound quality improvement functions.
2Adaptability or versatility
If the enclosure characteristics change due to vehicle occupants or window operations, then the acoustic environment becomes more variable, but detecting decreased sound becomes more difficult
Solution Approach 1:
The system dynamically adapts to changing acoustic environments by continuously adjusting the equalization filter characteristics based on real-time echo compensation filter measurements. This dynamic adaptation allows the system to maintain effective sound equalization and detection despite variations caused by vehicle occupants or window operations.
Solution Approach 2:
The system uses feedback from the echo compensation process to continuously refine the equalization filter characteristics. By monitoring the acoustic environment through the echo compensation filter and adjusting the equalization accordingly, the system maintains effective sound detection and quality across varying enclosure conditions.
Data Source
AI summary
An equalization system enhances the quality of communications between a remote party and a local party. The equalization system includes an equalization filter that equalizes an acoustic signal received from the remote party. The equalized acoustic signal is transmitted to a speaker based on the equalized acoustic signal. A device converts sound into electrical signals. The electrical signals are transmitted to an echo compensation filter that compensates for reflected sound. Filter characteristics of the equalization filter are based on filter characteristics of the echo compensation filter.