Sound Collection via Grid Point Beam-Forming
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Solution Overview
Problem
Existing microphone array beam-forming technologies face difficulties in accurately directing voice signals under strong interference, as the direction guiding algorithm becomes invalid in such scenarios, leading to poor sound collection efficiency.
Innovation Solution
A method involving the conversion of time domain signals into frequency domain signals, followed by beam-forming at preset grid points with calculated steering vectors, which determines average amplitudes and phases to synthesize a de-interference enhanced voice signal, effectively suppressing noise across multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional beam-forming direction guiding algorithm is used, then sound collection is effective in normal conditions, but it becomes invalid under strong interference leading to poor sound collection efficiency
Solution Approach 1:
The patent segments the frequency domain signals by performing beam-forming at multiple preset grid points (N≥2) covering different directions within the collecting range. Each grid point processes a portion of the frequency components, and the results are synthesized to form the final enhanced signal. This segmentation allows the system to handle interference from multiple directions simultaneously, resolving the contradiction between reliability in normal conditions and adaptability in interference environments.
2Object-affected harmful factors
If beam-forming is performed at multiple preset grid points with synthesized frequency domain signals, then de-interference enhancement is achieved, but calculation complexity increases
Solution Approach 1:
The patent applies partial action by selecting a finite number of preset grid points (N≥2) within the collecting range rather than processing all possible directions continuously. This discrete sampling approach provides sufficient noise suppression capability while significantly reducing calculation complexity compared to exhaustive directional processing. The grid points are strategically chosen to cover the main interference directions without requiring complete spatial coverage.
3Measurement precision
If steering vectors are calculated based on positional relationships between devices and grid points, then accurate beam-forming is achieved, but processing time increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating the steering vectors based on the fixed positional relationships between the sound collecting devices and the preset grid points. These steering vectors can be computed offline or cached before actual signal processing, so that during real-time operation, only the signal multiplication and synthesis steps are needed. This approach maintains beam-forming accuracy while significantly reducing real-time processing time.
Data Source
AI summary
A method for sound collection includes: converting time domain signals with a number of M collected by devices for sound collecting with a number of M into original frequency domain signals with a number of M; performing beam-forming on the M original frequency domain signals at each of preset grid points, to obtain beam-forming frequency domain signals with a number of N in one-to-one correspondence with the preset grid points; determining an average amplitude of frequency components with a number of N corresponding to each of frequency points with a number of K based on the beam-forming frequency domain signals with a number of N, and synthesizing a synthesized frequency domain signal including the frequency points and having an average amplitude as an amplitude at the each of the frequency points with a number of K; and converting the synthesized frequency domain signal into a synthesized time domain signal.