Noise source visualized data accumulation display method, data processing device and acoustic camera system
A technology of data accumulation and display method, which is applied in the direction of determining the direction or offset system, measuring device, signal processing, etc., and can solve the problems of buried and non-displayed noise characteristics of the analysis object
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[0032] Figure 1a , Figure 1b , Figure 1c It is a diagram illustrating the concept of beamforming. The beamforming method can be described by the following equation. yi(t) is the signal measured by the i-th microphone, and z(t) is the beam output. Among the signals measured by the M microphones, given the time delay in the direction of the virtual sound source, after multiplying the weighted value by the sensor, and adding the signal, the beam power can be obtained. If the actual sound source is in the same direction as the virtual sound source, the signal is amplified. In this way, the location of the noise source can be estimated. The beam power can be expressed numerically as follows.
[0033] b ( t ) = Σ j p m ( t - Δt ...
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