wav2leq {seewave}

Convert wave amplitude to equivalent continuous sound pressure level (Leq)

Description

This function computes the Leq value of a time wave based on the properties of the recording chain, if known.

Usage

wav2leq(wave, f, channel = 1, gain, dt = 1, sensitivity = -35, Vadc = 2, pref = 2 * 10^-5)

Arguments

wave

an R object.

f

sampling frequency of wave (in Hz). Does not need to be specified if embedded in wave.

channel

channel of the R object, by default left channel (1).

gain

total gain applied to the sound (preamplifer + amplifier), in dB.

dt

integration time step, in s (by default 1 s).

sensitivity

sensitivity of the microphone, in dB/V (by default - 35 dB/V).

Vadc

maximal voltage (peak to peak) converted by the analog to digital convertor ADC, in V (by default 2 V).

pref

sound pressure reference in the medium, in Pa (by default = 2*10^-5 Pa in air).

Value

A numeric vector of length 1 returning the Leq value, in dB.

Note

This function can be used to turn a recorder, as a Songmeter or an Audiomoth, in a kind of soundlevel meter.

Author(s)

Sylvain Haupert

See Also

wav2dBSPL

Examples

data(tico)
## with a 1 s time of integration (that is for the first time window)
wav2leq(tico, gain=18)
## with a 0.5 s time of integration (that is for 3 successive time windows)
wav2leq(tico, dt=0.5, gain=18)
## for the complete sound
wav2leq(tico, dt=duration(tico), gain=18)
## which is equivalent to
meandB(wav2dBSPL(tico, gain=18))