Convert Sone and Hz to dB

Convenience function to convert loudness (sone) and frequency (Hz) to sound pressure level (dB), combining ISO 532 and ISO 226:2023 conversions.

Usage

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

Arguments

sone

Numeric; loudness in sones. Must be positive.

freq_hz

Numeric; frequency in Hz (20-12500 Hz)

method

Character; ISO 532 method for sone-to-phon conversion. One of "zwicker" (default) or "moore-glasberg".

Value

Numeric vector of sound pressure level in dB SPL (re 20 uPa)

Details

This function combines two conversions:

1. sone -> phon using ISO 532 Zwicker or Moore-Glasberg method

2. (phon, frequency) -> SPL using ISO 226:2023 equal-loudness contours

Equivalent to: ucnv_phon_and_hz_to_db(ucnv_sone_to_phon(sone, method), freq_hz)

See also

ucnv_sone_to_phon(), ucnv_phon_and_hz_to_db()

Examples

# At 1 kHz reference
ucnv_sone_and_hz_to_db(1, 1000)  # Returns 40 dB (by definition)
#> [1] 40
ucnv_sone_and_hz_to_db(2, 1000)  # Returns ~50 dB (2x loudness ~= +10 dB)
#> [1] 50

# Same loudness at different frequencies requires different SPL
ucnv_sone_and_hz_to_db(2, 100)   # Higher dB (low freq needs more SPL)
#> [1] 71.36646
ucnv_sone_and_hz_to_db(2, 1000)  # Reference
#> [1] 50
ucnv_sone_and_hz_to_db(2, 4000)  # Lower dB (high freq more sensitive)
#> [1] 47.29502