National Marine Mammal Foundation, 2240 Shelter Island Drive, Number 200, San Diego, California 92106, USA.
United States Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, Code 715, 53560 Hull Street, San Diego, California 92152, USA.
J Acoust Soc Am. 2017 Oct;142(4):1897. doi: 10.1121/1.5006186.
Critical ratios (CRs) are useful for estimating detection thresholds of tonal signals when the spectral density of noise is known. In cetaceans, CRs have only been measured for a few animals representing four odontocete species. These data are sparse, particularly for lower frequencies where anthropogenic noise is concentrated. There is currently no systematic method for implementing CR predictions (e.g., a composite frequency-dependent CR function). The current study measures CRs for two bottlenose dolphins (Tursiops truncatus) and estimates composite CR functions. The composite models can aid in predicting and extrapolating auditory masking for a broad range of frequencies.
临界比率 (CRs) 在已知噪声频谱密度时，可用于估计音调信号的检测阈值。在鲸类动物中，只有少数几种齿鲸物种的几种动物测量了 CRs。这些数据很少，特别是在人为噪声集中的低频段。目前还没有系统的方法来实施 CR 预测（例如，复合频率相关的 CR 函数）。本研究测量了两只宽吻海豚（Tursiops truncatus）的 CRs，并估计了复合 CR 函数。复合模型可以帮助预测和推断广泛频率范围内的听觉掩蔽。
