An Indian temple bell’s energy shifts between modes over seconds after striking
Evidence
The Indian temple bell exhibits a set of strong frequency components just after the strike (the strike itself is visible as the vertical line at the onset of the sound in both the acoustic pressure time waveform and in the spectrogram, since a brief pulse of energy has a spectrum that is continuous), and finally after about 5 seconds, the output is dominated by a strong low-frequency component whose amplitude grows to a peak and then dies away over a long period of time. Notice that there is a periodic undulation to the output that is visible clearly on the time waveform. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1319
Categorization
Category: Causal Relationships
- XREF: Connects to the chapter’s earlier discussion of energy shifting between vibration modes (spaghetti diagram / bell story) — the temple bell is the canonical real case.
- STORYSTEM: A struck bell whose energy piles into a low hum only seconds later is a lovely acoustic metaphor: delayed response, growth from a strike — could seed a scene or poem about something that arrives late after an initial impact.
- DEFINE: Clarifies why the strike appears as a vertical line in the spectrogram — a brief pulse has a continuous spectrum.
Related
- A struck bell’s spectral components begin at staggered times rather than together (similarity 0.83)
- A struck bell’s overtones enter at different times, shaping perceived timbre. (similarity 0.82)
- The bell acts as a frequency-dependent reflector that shifts brass mode frequencies. (similarity 0.79)