sliding.pixel.comparison: sliding.pixel.comparison

In callsync: Recording Synchronisation, Call Detection and Assignment, Audio Analysis

sliding.pixel.comparison

Description

Can be used to run spectrographic cross correlation. Both spectrograms are zero-padded and slid over each other. For each step the difference is computed. The function returns the absolute difference at the point at the minimum (maximal signal overlap).

Usage

sliding.pixel.comparison(s1, s2, step_size = 1)

Arguments

s1	numeric matrix, the first spectrogram.
s2	numeric matrix, the second spectrogram.
step_size	numeric, how many pixels should be moved for each step. Default is '1'.

Value

Returns the distance at the point of maximal signal overlap.

Examples

require(callsync)
require(seewave)
require(tuneR)
path_git = 'https://raw.githubusercontent.com'
path_repo = '/simeonqs/callsync/master/tests/testthat/files'
file_1 = '/wave_1.wav'
file_2 = '/wave_2.wav'
url_1 = paste0(path_git, path_repo, file_1)
url_2 = paste0(path_git, path_repo, file_2)
local_file_1 = paste(tempdir(), file_1, sep = '/')
local_file_2 = paste(tempdir(), file_2, sep = '/')
if(!file.exists(local_file_1))
  download.file(url_1, destfile = local_file_1, mode = 'wb',)
if(!file.exists(local_file_2))
  download.file(url_2, destfile = local_file_2, mode = 'wb')
wave_1 = readWave(local_file_1)
wave_2 = readWave(local_file_2)
so_1 = create.spec.object(wave = wave_1, plot_it = FALSE)
so_2 = create.spec.object(wave = wave_2, plot_it = FALSE)
out = sliding.pixel.comparison(so_1, so_2)

callsync documentation built on May 29, 2024, 5:30 a.m.