What is the approximate damping rate of the glottal (source) spectrum graph?

The approximate damping rate of the glottal (source) spectrum is characterized by a loss of 12 decibels for every octave. This means that as you move up an octave in frequency, the amplitude of the sound decreases by 12 decibels. This is a significant concept in speech science, as it depicts how the energy of the vocal signal diminishes at higher frequencies.

This damping contributes to the perceived quality of voice and the overall timbre of speech sounds. The glottal spectrum generated by the vocal folds exhibits this behavior due to the physical properties of the vocal tract and the way that sound waves propagate through it. Understanding this loss helps in analyzing voice quality and speech acoustics, allowing for clearer insights into speech production and potential voice disorders.

By recognizing this specific damping rate, one can appreciate how the properties of voice change across different pitches, which is essential for both theoretical knowledge in speech science and practical applications in speech therapy and vocal training.