Loudness rises once noise bandwidth exceeds the critical band at constant SPL.

Evidence

A narrowband noise with a fixed centre frequency is used as the reference sound, to which the subject compares the test sound, band-limited noise whose sound pressure level and centre frequency are equal to the reference sound (see Figure 9.15). The change in perceived loudness is measured with some psychoacoustic test, and a schematic plot of such a test result is shown in Figure 9.16. Interestingly, the loudness is constant up to a certain value of bandwidth (Fastl and Zwicker, 2007). This bandwidth is 160 Hz for the center frequency 1 kHz, as shown in the figure, beyond which the loudness increases steadily. The knee point in the plot is thought to be the position where the test sound’s spectrum spreads over more than a single critical band Figure 9. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1034 (#corroborates, via linked claim)

Categorization

• corroborated: 2 independent passages support this claim
• XREF: connects to: Loudness stays constant below critical bandwidth then grows beyond it — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1034; Loudness grows when sound energy spills beyond a single critical band; Wider bandwidth increases perceived loudness at equal sound pressure — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 868 (+8 more)

Related

• Loudness stays constant below critical bandwidth then grows beyond it (similarity 0.96)
• Wider bandwidth increases perceived loudness at equal sound pressure (similarity 0.91)
• Loudness grows with bandwidth via area tradeoff except at extreme levels (similarity 0.91)
• Loudness grows when sound energy spills beyond a single critical band (similarity 0.91)
• Loudness is the summed specific loudness across critical-band rates, not the raw spectral level (similarity 0.91)
• Wideband sounds are louder than narrowband sounds at equal dB SPL (similarity 0.90)
• Loudness depends on more than physical sound intensity alone (similarity 0.89)
• Spreading a sound’s energy across more critical bands increases perceived loudness without raising intensity (similarity 0.89)
• Loudness rises with bandwidth beyond the critical band despite falling pattern height (similarity 0.89)
• Widening a sound’s bandwidth makes it seem louder at equal total power (similarity 0.89)
• Uniform exciting noise delivers equal intensity to every critical band (similarity 0.88)
• Total loudness is the integral of specific loudness over critical-band rate (similarity 0.88)
• Loudness is not reducible to sound pressure level or signal power (similarity 0.87)
• Critical bandwidth marks the point where noise loudness begins to grow with bandwidth (similarity 0.87)
• Noise loudness is level-independent until bandwidth exceeds the critical bandwidth. (similarity 0.86)

Broader Connections

• Loudness stays constant below critical bandwidth then grows beyond it #corroborates (0.98) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1034
• Loudness grows when sound energy spills beyond a single critical band #corroborates (0.97)
• Wideband sounds are louder than narrowband sounds at equal dB SPL #corroborates (0.96)
• Wider bandwidth increases perceived loudness at equal sound pressure #corroborates (0.95) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 868
• Widening a sound’s bandwidth makes it seem louder at equal total power #corroborates (0.93) — Eric J. Heller, Why You Hear What You Hear- An…, 2008
• Spreading a sound’s energy across more critical bands increases perceived loudness without raising intensity #corroborates (0.92) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 665
• Loudness grows with bandwidth via area tradeoff except at extreme levels #qualifies (0.85) — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1288
• Total noise power rises with bandwidth while center frequency contributes nothing #expands (0.82)
• Total loudness is the integral of specific loudness over critical-band rate #expands (0.80) — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1250
• Loudness is the summed specific loudness across critical-band rates, not the raw spectral level #expands (0.78)
• Uniform exciting noise delivers equal intensity to every critical band #expands (0.75) — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1189