wav2dBSPL {seewave}

Convert wave amplitude to instantaneous sound pressure level (dB SPL)

Description

This function applies an absolute dB SPL scale to the amplitude of a time wave based on the properties of the recording chain, if known.

Usage

wav2dBSPL(wave, f, channel = 1, gain, 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.

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 the same legnth as wave containing the sound waveform in dB SPL (Sound Pressure level 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

wav2leq

Examples

## note that the original gain, sensitivity and Vadc of tico
## are unknown, this is therefore a kind of 'unreal' example
data(tico)
res <- wav2dBSPL(tico, gain=18)
plot(x=seq(0,duration(tico),length=length(tico@left)), y=res, type="l", xlab="Time (s)",
ylab="dB SPL", las=1)
## dB SPL approximation for the complete sound
meandB(res)