attenuation: Estimate attenuation of sound pressure level

In baRulho: Quantifying (Animal) Sound Degradation

Estimate attenuation of sound pressure level

Description

attenuation estimates atmospheric attenuation and atmospheric absorption.

Usage

attenuation(
  frequency,
  dist0,
  dist,
  temp = 20,
  rh = 60,
  pa = 101325,
  hab.att.coef = 0.02
)

Arguments

frequency	Numeric vector of length 1 with frequency (in Hertz).
dist0	Numeric vector of length 1 with distance (m) for the reference SPL.
dist	Numeric vector of length 1 with distance (m) over which a sound propagates.
temp	Numeric vector of length 1 with frequency (in Celsius). Default is 20.
rh	Numeric vector of length 1 with relative humidity (in percentage). Default is 60.
pa	Numeric vector of length 1 with atmospheric (barometric) pressure in Pa (standard: 101325, default). Used for atmospheric attenuation.
hab.att.coef	Attenuation coefficient of the habitat (in dB/kHz/m).

Details

Calculate the geometric, atmospheric and habitat attenuation and the overall expected attenuation (the sum of the other three) based on temperature, relative humidity, atmospheric pressure and sound frequency. Attenuation values are given in dB. The function is modified from http://www.sengpielaudio.com

Value

Returns the geometric, atmospheric and habitat attenuation (in dB) as well as the combined attenuation.

Author(s)

Marcelo Araya-Salas ([e-mail])

References

Araya-Salas M., E. Grabarczyk, M. Quiroz-Oliva, A. Garcia-Rodriguez, A. Rico-Guevara. (2023), baRulho: an R package to quantify degradation in animal acoustic signals .bioRxiv 2023.11.22.568305.

See Also

Other miscellaneous: add_noise(), noise_profile()

Examples

{
  # measure attenuation
  attenuation(frequency = 2000, dist = 50, dist0 = 1)
}

baRulho documentation built on Sept. 11, 2024, 7:21 p.m.