By “acoustic” data we also mean vibrations in structures, internal stress waves, and structure–fluid interactions which involve acoustic radiation. There are a number of acoustic sensors that produce alternating voltage fluctuations that are then sampled at regular time intervals for analysis in the time, spatial, or frequency domains. The most essential part of data acquisition can be seen as objective signal calibration and characterization of signal-to-noise ratio (SNR). Calibration for multichannel systems involves not just signal amplitude, but relative phase or time delay between channels, as well as signal leakage, or cross-talk, between channels.
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Swanson, D.C. (2008). Acoustic Data Acquisition. In: Havelock, D., Kuwano, S., Vorländer, M. (eds) Handbook of Signal Processing in Acoustics. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30441-0_2
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