Acoustics and Waveform Quiz

Which of the following best describes a spectrogram?

• A chart of vocal fold vibration patterns

• A diagram of the human vocal tract

• A graph showing the amplitude of sound waves

• A visual representation of sound intensity over time

What does a higher fundamental frequency indicate about a sound?

• It has less intensity

• It has more harmonics

• It has a higher pitch

• It has a lower pitch

The glottal source signal is considered complex periodic because...

• A. It is filtered by the vocal tract

• B. It contains multiple sine waves that repeat regularly

• C. It varies in amplitude randomly

• • D. It has no clear fundamental frequency

Which diacritic accurately signals that a segment is prolonged?

• [ʰ]

• [̥]

• [ː]

• [ˈ]

When comparing a waveform and a spectrum, which statement best differentiates what each represents regarding the acoustic properties of a sound?

• • a) Both represent amplitude over time, but a spectrum is a simplified version.

• • b) A waveform shows amplitude over frequency, while a spectrum shows frequency over time.

• • c) A waveform displays the sound's intensity over time, and a spectrum displays its power over frequency.

• d) A waveform shows amplitude over time, while a spectrum shows amplitude over frequency.

How does the position of the tongue body most directly influence the frequency of Formant 1 (F1), and what is the most accurate acoustic consequence of a higher F1 value?

• • a) Higher tongue position raises F1, indicating a higher vowel.

• b) Higher tongue position lowers F1, indicating a higher vowel.

• • c) Tongue advancement raises F1, indicating a front vowel.

• • d) Tongue retraction lowers F1, indicating a back vowel.

The glottal source sound is described as "complex periodic." Which of the following best elaborates on what "complex" and "periodic" signify in this context?

• • a) "Complex" means it is a mix of voiced and unvoiced components; "periodic" means it occurs at irregular intervals.

• b) "Complex" means it contains multiple frequency components; "periodic" means it repeats in a consistent pattern.

• • c) "Complex" means it changes over time; "periodic" means it has a single repeating frequency.

• • d) "Complex" means it is affected by resonance; "periodic" means it is generated at the glottis.

Describe the relationship between the fundamental frequency (f0) and the harmonic frequencies in the spectrum of the glottal source. How does this relationship most precisely change when f0 decreases?

• • a) Harmonics are odd-number multiples of f0; the spacing between harmonics increases.

• b) Harmonics are whole-number multiples of f0; the spacing between harmonics decreases.

• c) Harmonics are fractions of f0; the spacing between harmonics remains constant.

• • d) Harmonics are unrelated to f0; the spacing between harmonics becomes unpredictable.

While spectrograms are valuable tools, they are not used to directly visualize vocal anatomy. Which two key acoustic properties of speech do spectrograms help us analyze, and why are these most critical for a comprehensive speech assessment?

• • a) Vocal intensity and air pressure; to assess respiratory support.

• • b) Fundamental frequency and nasality; to evaluate resonance.

• c) Frequency components and changes in sound over time; to identify subtle variations in speech sounds and patterns.

• • d) Amplitude and duration of voicing; to measure phonation time.

What is the primary purpose of diacritics in phonetic transcription, and why is it most important to use them in addition to broad phonetic symbols in clinical settings?

• • a) To simplify the transcription process and make it faster.

• • b) To represent different languages and dialects.

• c) To provide finer detail about pronunciation, capturing subtle variations that can be clinically significant.

• • d) To indicate the emotional state of the speaker.

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