Compensation Filter for Stable Differential Beam Forming
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Solution Overview
Problem
Existing microphone arrays with microphones spaced greater than 2.5 cm struggle to maintain constant beam characteristics for differential beam forming, leading to reduced voice signal enhancement and increased noise interference.
Innovation Solution
A method and apparatus that adjust the amplitude and phase of differential beam forming signals based on the distance between microphones and signal frequency, using a compensation filter to ensure constant beam characteristics across various microphone array specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between microphones in the array is increased to improve voice signal capture, then the microphone array can better capture spatial signals, but the beam characteristics become unstable and noise suppression capability deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing a compensation filter that dynamically adjusts the differential beam forming signal based on the actual distance between microphones and the signal frequency. The compensation filter modifies the amplitude and phase parameters of the beam forming signal to maintain stable beam characteristics regardless of microphone spacing variations.
Solution Approach 2:
The patent implements dynamics by making the beam forming process adaptive to changing conditions. The compensation filter continuously adjusts the differential beam forming signal based on real-time distance and frequency parameters, transforming a static beam forming approach into a dynamic one that maintains stability across varying microphone configurations.
2Device complexity
If a fixed differential algorithm is used to simplify processing, then the algorithm is easy to implement, but it cannot maintain constant beam characteristics when microphone distance exceeds 2.5 cm
Solution Approach 1:
The patent introduces a compensation filter as an intermediary component between the differential beam forming algorithm and the final output. This compensation filter acts as a mediator that corrects the beam forming signal based on distance and frequency, allowing the use of simpler differential algorithms while maintaining high beam characteristic consistency through the compensating intermediary stage.
3Reliability
If the microphone array is designed for small spacing to ensure beam stability, then beam characteristics remain constant, but the array cannot effectively process spatial signals from various directions
Solution Approach 1:
The patent achieves universality by designing a compensation filter that handles multiple functions: it corrects amplitude variations, adjusts phase differences, and adapts to different microphone spacing configurations. This single compensation mechanism enables the microphone array to maintain stable beam characteristics while simultaneously processing spatial signals from various directions and configurations.
Data Source
AI summary
Some embodiments of the present disclosure provide a method and an apparatus for forming a differential beam, a method and an apparatus for processing a signal, and a chip. The method for forming a differential beam includes: obtaining a differential beam forming signal according to an input signal acquired by two microphones in a microphone array (101); and performing a nonlinear adjustment on at least an amplitude of the differential beam forming signal based on a distance between the two microphones and a signal frequency of the input signal to obtain the adjusted differential beam forming signal (102). With the above solution, a constant beam characteristic of the differential beam forming signal can be ensured as much as possible for microphone arrays of different specifications.