Convert between Hz and Barks.

Source: R/bark_and_hz.R

Use bark() to convert Hz into Barks. Use hz() to convert Barks back into Hz. Both of these functions are based on the formula provided Traunmüller (1990).

bark(x)

hz(x)

Arguments

x

A number.

Value

The number transformed into Barks or Hz.

Note

Because the Traunmüller's formula is not especially precise (especially because Zwicker's original scale was biased toward nice round numbers), there will inevitably be some rounding error. However, it is small enough that it should be of little consequence.

References

Traunmüller, Hartmut. "Auditory scales of frequency representation." The Journal of the Acoustical Society of America 88, no. 97 (1990). https://doi.org/10.1121/1.399849.

Zwicker, Eberhard. "Subdivision of the Audible Frequency Range into Critical Bands (Frequenzgruppen)." The Journal of the Acoustical Society of America 33, no. 2 (1961): 248–248. https://doi.org/10.1121/1.1908630.

Examples

# The simplest case is by converting one number.
bark(500)
#> [1] 4.919187
hz(3)
#> [1] 297.1993

# You can also convert a whole vector of numbers.
data(vowels)
head(bark(vowels$F1))
#> [1] 3.705098 3.792047 3.176060 2.755086 3.527196 3.163864

#' This is probably easier within a tidyverse pipeline
if (FALSE) {
library(dplyr)
vowels %>%
   select(vowel, F1:F4) %>%
   mutate(F1_bark = bark(F1),
          F2_bark = bark(F2),
          F3_bark = bark(F3),
          F4_bark = bark(F4))

# Or, more elegantly, using dplyr::across()
vowels %>%
   select(vowel, F1:F4) %>%
   mutate(across(F1:F4, bark, .names = "{col}_bark"))
}