Function attenuation_coef 

pub fn attenuation_coef(
    freq: Float,
    hr: Float,
    ps: Float,
    ps0: Float,
    t: Float,
) -> Float

Returns an attenuation coefficients due to atmospheric absorption in a unit of [Np/mm].

Bass, Henry E., et al. “Atmospheric absorption of sound: Further developments.” The Journal of the Acoustical Society of America 97.1 (1995): 680-683.

Arguments

• freq - A frequency of sound [Hz]
• hr - A relative humidity [%]
• ps - An atmospheric pressure [atm]
• ps0 - A reference atmospheric pressure [atm]
• t - An atmospheric temperature [K]