Convert dB and Hz Directly to Sone

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

Usage

ucnv_db_and_hz_to_sone(
  spl_db,
  freq_hz,
  method = c("zwicker", "moore-glasberg")
)

Arguments

spl_db

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

freq_hz

Numeric; frequency in Hz (20-12500 Hz)

method

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

Value

Numeric vector of loudness values in sones

Details

This function combines two conversions:

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

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

Equivalent to: ucnv_phon_to_sone(ucnv_db_and_hz_to_phon(spl_db, freq_hz), method)

See also

ucnv_db_and_hz_to_phon(), ucnv_phon_to_sone()

Examples

# At 1 kHz reference
ucnv_db_and_hz_to_sone(40, 1000)  # Returns 1.0 (by definition)
#> [1] 1
ucnv_db_and_hz_to_sone(50, 1000)  # Returns ~2.0 (+10 dB ~= 2x loudness)
#> [1] 2

# Low frequency requires more SPL for same loudness
ucnv_db_and_hz_to_sone(60, 100)   # Lower sone value
#> [1] 0.610957
ucnv_db_and_hz_to_sone(60, 1000)  # Higher sone value
#> [1] 4