Tonality Overview

The Tonality profile allows the identification of emerging tones (number, frequencies, levels, etc.) to determine the tones' contribution in the perception of a sound.

In Sound: Analysis and Specification, the computation profile includes the following indicators:

  • Prominence Ratio (dB) is based on the ECMA-418-1 (former ECMA 74 Annex D) and ISO7779:1999 standards.
  • Details Prominence Ratio
  • Tone-to-Noise Ratio (dB) is based on the ECMA-418-1 (former ECMA 74 Annex D) and ISO7779:1999 standards.
  • Details Tone-to-Noise Ratio
  • Tonal Audibility and Adjustment Kt ISO1996-2:2007 Annex C (dB) are based on Annex C of the 2007 edition of ISO1996-2 standard for the Objective method for assessing the audibility of tones in noise.
  • ISO1996-2:2007 Details (full signal)
  • Tonal Audibility ISO 1996-2:2007 (dB) vs time
  • ISO1996-2:2007 details vs time
  • Mean Difference DIN45681 / ISO/PAS 20065 (dB)
  • Tonal adjustment Kt DIN45681 / ISO/PAS 20065 (dB) is based on the DIN 45681:2005-03 standard. It is the same as standard ISO/PAS 20065:2016. Annex J of the 2017 edition of ISO 1996-2 is also identical, as it now refers directly to ISO/PAS 20065, while the 2007 edition's model in Annex C was removed.
  • DIN45681 / ISO/PAS 20065 Details
  • DIN45681 / ISO/PAS 20065 Tonailty vs time
  • Average Tonality Aures (tu) and Avergae Tonality Aures (tu) vs time are based on the Aures' model for tonality.
  • Psychoacoustic Tonality is based on the ECMA-418-2 (formerly known as ECMA 74 Annex G) standard.
  • Frequency vs time ECMA-418-2 / ECMA74-G
  • Psychoacoustic Tonality ECMA-418-2 / ECMA74-G (tuHMS) vs time

For each of these indicators, the computation profile includes an automatic tone detection procedure, so that you don't need to specify the tone frequency. Different procedures are specified in standards ISO1996-2:2007 and DIN45681, and in Aures' reference paper. The computation profile uses the specific procedure in each case.

For the Prominence Ratio and the Tone-to-Noise Ratio, the standards ECMA 418-1 and ISO7779:1999 do not include an automatic tone detection procedure. Thus, a specific procedure was developed and inspired by W. R. Bray, Methods for automating prominent tone evaluation and for considering variations with time or other reference quantities, Acoustics’ 08.