31.

31.

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統計： A(3), B(12), C(1), D(20), E(0) #1325054

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B1 · 2017/05/13

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37. (A) When you are close to where the pebble fell, the waves are clearly in a circle, centered on where the pebble fell. (B) These are measured to ensure compliance with laws that govern acceptable sound emitted from a vehicle. (C) Engineers can use several analysis techniques to identify noise sources including near-field acoustic holography (NAH) and beamforming. (D) Beamforming presents several challenges including simultaneously measuring a large number of microphone sensors, transmitting and saving this large amount of acquired waveform data, and being able to quickly process large data sets.

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