Topics for today:
- Quiz on reading and lecture material.
- Harmonics and complicated periodic vibrations
- Periodic waveforms have harmonic spectra: signal energy is discrete at frequencies that are integer multiples of the
fundamental frequency, known as harmonics, overtones, or harmonic partials.
- The distribution of energy among the harmonics gives rise to audible changes in the
perceived sound quality, or timbre. For example, different sung vowels at the same pitch are recognizable as “ahh,”
“ohhh,” “eeee”, and so forth.
- Audible examples of various effects; experiment to measure the speed of sound, etc.
Topics for the next lecture:
- Reading assignment: Chapters 6 and 8 from the Strong textbook.
- Wave interference; sound level (decibel).
Robert C. Maher, Ph.D., P.E.
Montana State University
P.O. Box 173780
Bozeman, MT 59717-3780
Office: 616 Cobleigh
Tel: +1 (406) 994-7759
ECE Main Office: (406) 994-2505
Fax: (406) 994-5958
rmaher@montana.edu
Lab:
Cobleigh Hall 410