Correction: Noise from Unconventional Aircraft: A Review of Current Measurement Techniques, Psychoacoustics, Metrics and Regulation

The following author errors are noted and amended:

• An incorrect unmanned aircraft system (UAS) model identifier had been included, which entailed making amendments to:

  • the legend of Fig. 1,

  • the caption of Fig. 2, and

  • the axis labelling of Fig. 3¹.

• Table 2 contained incorrect referencing and a missing reference.

• The reference list [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119] required updating for the amended Table 2 references. The reference list amendment to include the missing reference means that reference numbering for refs. [69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119] is incremented by 1.

• The reference list also required amendment of an incorrect publication year for ref. [94].

Amended versions of the figures, table and reference list are provided in this correction. The errors identified do not affect any of the findings in the original article [120].

Fig. 1

Comparison of narrowband spectra for a range of vehicles, including two multicopter UAS (all spectra normalised to 70 dB $L_{\textrm{Aeq}}$, with frequency line spacing $\Delta f = 4$ Hz)

Fig. 2

Spectrograms of (top) Airbus A320 passenger jet and (bottom) Yuneec H520E hexacopter, with frequency line spacing $\Delta f=4$ Hz and time resolution $\Delta t = 0.25$ s (corresponding with spectra shown in Fig. 1)

Fig. 3

Violin plots [67] for distributions of time-varying SQM values for vehicle sounds (corresponding with spectra shown in Fig. 1); diamond markers indicate 95^th cumulative distribution percentile values calculation methods: N according to ISO 532-1:2017 [59], S, R, and F according to Fastl and Zwicker [54], and T according to ECMA-418-2:2022 [64]

Table 2 Summary of relevant studies investigating AAM detection, noticeability, perception or response with human participants