import_audio {soundClass}

Import a recording

Description

Import a "wav" recording. If the recording is stereo it is converted to mono by keeping the channel with overall higher amplitude

Usage

import_audio(path, butt = TRUE, low, high, tx = 1)

Arguments

path

Character. Full path to the recording

butt

Logical. If TRUE filters the recording with a 12th order filter. The filter is applied twice to better cleaning of the recording

low

Minimum frequency in kHz for the butterworth filter

high

Maximum frequency in kHz for the butterworth filter

tx

Time expanded. Only used in recorders specifically intended for bat recordings. Can take the values "auto" or any numeric value. If the recording is not time expanded tx must be set to 1 (the default). If it's time expanded the numeric value corresponding to the time expansion should be indicated or "auto" should be selected. If tx = "auto" the function assumes that sampling rates < 50kHz corresponds to tx = 10 and > 50kHz to tx = 1.

Value

An object of class "rc". This object is a list with the following components:

• sound_samples – sound samples of the recording

• file_name – name of the recording

• file_time – time of modification of the file (indicated for Pettersson Elektronic detectors, for other manufactures creation time should be preferable but it's not implemented yet)

• fs – sample frequency

• tx – expanded time factor

Author(s)

Bruno Silva

Examples

# Create a sample wav file in a temporary directory
recording <- tuneR::sine(440)
temp_dir <- tempdir()
rec_path <- file.path(temp_dir, "recording.wav")
tuneR::writeWave(recording, filename = rec_path)
# Import the sample wav file
new_rec <- import_audio(rec_path, low = 1, high = 20, tx = 1)
new_rec
file.remove(rec_path)