The source excites all harmonics even when a resonator only supports odd ones.

Evidence

Figure 4.24 shows waveforms and spectra for the note middle C played on a clarinet and a tenor saxophone. The saxophone spectrum contains all harmonics since its resonator is conical. The clarinet spectrum exhibits the odd harmonics clearly as its resonator is a cylindrical pipe closed at one end (see Figure 4.18), but there is also energy clearly visible in some of the even harmonics. Although the resonator itself does not support the even modes, the spectrum of the sound source does contain all harmonics (the saxophone Displacement Figure 4. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1255

Categorization

• DEFINE: Clarifies that timber comes from resonator filtering the source, not the source alone — source and resonator are distinct contributors to spectrum.
• XREF: connects to: Reed excitation injects all harmonics even when resonator rejects even modes — David Howard, Jamie Angus, coustics and Psychoacoustics, 1255; Realistic periodic sound sources generate many harmonics, not single frequencies. — Eric J. Heller, Why You Hear What You Hear- An…, 1745; Even harmonics appear in clarinet sound despite its closed cylindrical resonator

Broader Connections

• Reed excitation injects all harmonics even when resonator rejects even modes #corroborates (0.95) — David Howard, Jamie Angus, coustics and Psychoacoustics, 1255
• Even harmonics appear in clarinet sound despite its closed cylindrical resonator #exemplifies (0.90)
• Realistic periodic sound sources generate many harmonics, not single frequencies. #corroborates (0.75) — Eric J. Heller, Why You Hear What You Hear- An…, 1745