When comparing speech samples, which one will show more harmonics based on the fundamental frequency (Fo)?

The relationship between fundamental frequency (Fo) and the number of harmonics present in a speech sample is critical for understanding the characteristics of sound production. As the fundamental frequency increases, the harmonic series, which is made up of whole number multiples of the fundamental frequency, also becomes more pronounced.

When analyzing speech samples at different fundamental frequencies, a higher Fo results in a greater separation of harmonics within the audible frequency range, allowing more harmonics to be perceived. For example, at 280Hz, the first few harmonics (560Hz, 840Hz, and so on) will fall within the upper limits of human hearing (which typically goes up to approximately 20 kHz).

In contrast, samples with lower fundamental frequencies like 80Hz or 120Hz will have harmonics that cluster more closely together and may not extend as far into the range of perception compared to higher frequencies. As a result, while each sample might have its own set of harmonics based on its fundamental frequency, the sample with 280Hz is likely to demonstrate a richer harmonic structure that can be heard distinctly compared to the others, making it the most suitable choice when looking for a sample with more harmonics.