Harmonics cease being resolved when their spacing falls below the ERB

Evidence

In the spectrogram of the third sound, in which only the odd harmonics up to the nineteenth are present, there are approximately seven resolved horizontal energy bands, but in this case these are the lowest seven odd harmonics, or the first to the thirteenth harmonics inclusive. The point at which the odd harmonics cease to be resolved occurs where the spacing between them (2 f0—the spacing between the odd harmonics) is less than the ERB. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1505

Categorization

• DEFINE: Demonstrates the ERB (equivalent rectangular bandwidth) concept in action: harmonic spacing must exceed ERB for resolution to occur.
• XREF: connects to: A filter resolves a harmonic it is centered on even when bandwidth exceeds spacing — David Howard, Jamie Angus, coustics and Psychoacoustics, 884