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Saturday, February 12 • 3:00pm - 8:00pm
Implications of Sampling Theory on Acoustic Impulse-Noise Measurement and Damage Risk Criteria

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For impulsive noise, such as produced by weapons fire, it is often suggested that sampling rates of at least 200 kHz are necessary (e.g., MIL-STD-1474E) to accurately estimate the damage risk. In many cases, the driving motivation for this high sampling rate is to ensure a high level of temporal resolution in the impulse waveform. However, the Nyquist-Shannon sampling theorem specifies that a sampled signal can accurately reconstruct both the amplitude and phase information of a signal as long as the sampling rate is at least twice the highest frequency present in the original analog signal. Thus, it is possible to reconstruct a band-limited signal with the same temporal resolution as one captured at a higher sampling rate if the contributions of energy above the Nyquist rate can be ignored. Here we show how resampling techniques can be applied to a signal sampled at 48 kHz to extract A-weighted peak pressure estimates within 0.2 dB of those obtained at a higher sampling rate. The results suggest that sampling rates for impulsive noise should be based on the range of frequencies that are expected to make a meaningful contribution to the risk of injury, rather than on concerns about temporal resolution.

avatar for Douglas Brungart, Ph.D

Douglas Brungart, Ph.D

Dr. Brungart serves as Chief Scientist for the Audiology and Speech Center at Walter Reed National Military Medical Center. The ASC provides clinical care which includes audiology and speech/language pathology services in addition, research conducted in the Scientific and Clinical... Read More →

Christopher Smalt, Ph.D

Technical Staff, MIT Lincoln Laboratory
Dr. Smalt is a technical staff member in the Human Health & Performance Systems Group at the Massachusetts Institute of Technology Lincoln Laboratory. His current work focuses on computational modeling of hearing damage mechanisms and the effect of noise exposure on hearing and cognitive... Read More →

Saturday February 12, 2022 3:00pm - 8:00pm CST