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Convert Sone to Phon

ucnv_sone_to_phon.Rd

Convert loudness (sone) to loudness level (phon) using ISO 532 methods.

Usage

ucnv_sone_to_phon(sone, method = c("zwicker", "moore-glasberg"))

Arguments

sone

Numeric; loudness in sones. Must be positive.

method

Character; conversion method. One of:

  • "zwicker" (default): ISO 532-1 Zwicker method with piecewise formula

  • "moore-glasberg": ISO 532-2 Moore-Glasberg method with lookup table

Value

Numeric vector of loudness level values in phons

Details

The Zwicker method (ISO 532-1) uses:

  • For sone < 1: phon = 40 x sone^0.35

  • For sone >= 1: phon = 40 + 10 x log2(sone)

The Moore-Glasberg method (ISO 532-2) uses a lookup table with 23 reference points and log-linear interpolation.

By definition, 1 sone = 40 phons (a 1 kHz tone at 40 dB SPL).

Vectorization

This function is fully vectorized and can process vectors of sone values efficiently.

See also

ucnv_phon_to_sone(), ucnv_db_and_hz_to_phon(), ucnv_phon_and_hz_to_db()

Examples

# Reference value
ucnv_sone_to_phon(1)  # Returns 40 (by definition)
#> [1] 40

# Doubling property: 2x loudness ~= +10 phon
ucnv_sone_to_phon(2)  # Returns ~50
#> [1] 50
ucnv_sone_to_phon(4)  # Returns ~60
#> [1] 60

# Low levels (below 1 sone)
ucnv_sone_to_phon(0.15)  # Returns ~20
#> [1] 20.59169

# Vectorized
ucnv_sone_to_phon(c(0.15, 1, 4, 16))
#> [1] 20.59169 40.00000 60.00000 80.00000

# Moore-Glasberg method
ucnv_sone_to_phon(1, method = "moore-glasberg")
#> [1] 40