Playback Note
The samples are original 48-kHz mono PCM16 WAV files. Browser and audio-hardware frequency responses may attenuate components above 16 kHz. All spectrograms use the same time-frequency settings and display scale; the outlined box marks the 16–20 kHz near-ultrasonic band.
Interpretation Notice
Online playback is intended for qualitative inspection and may differ from the controlled laboratory playback configuration. The quantitative perceptual evaluation reported in the revised manuscript used a fixed laptop and JBL Go 3 loudspeaker under controlled listening conditions.