Playback Note
The downloadable files are the original 48-kHz PCM16 WAV samples. Browser, sound-card, headphone, and loudspeaker frequency responses may attenuate components above 16 kHz. The clean, AdvNup, and perturbation spectrograms use the same time-frequency configuration and display scale, with the 16–20 kHz near-ultrasonic band highlighted.
Interpretation Notice
These samples are provided for qualitative inspection of the audio and its spectral characteristics. Online playback depends on the visitor's browser and audio hardware and may not reproduce the controlled laboratory playback configuration.
The quantitative perceptual evaluation reported in the revised manuscript was conducted using a fixed laptop and JBL Go 3 loudspeaker under controlled listening conditions.