COMD5070 Physiology Practice Exam With Answers (49 Solved Questions)

Name: COMD5070 Physiology Practice Exam With Answers (49 Solved Questions)
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COMD 5070 exam 3 study guide
1. what is science? [4 features of the scientific method]
empirical: collect and interpret data.
deterministic: physical laws apply to principals. not random. generalizations from data to extend on to other
situations
predictive: learn cause and effect relationships
parsimony: describe things in fairly economical terms
2. semitones [how many semitones in one octave, two octaves, how many Hz in an octave, etc.]
octave: doubling or halving of a frequency. 1 octave:12 semitones., semitone=1/12 octave - Each semitone
is a nonlinear step as you go from low to high- Each step up is bigger than the last one, about 5.9%higher
frequency than the one before it. Octave: mathematical relationship btwn freqs; doubling /half of
frequency 400= 800 (up) & 200 (down) -12 semitone= 1 octave
3. sampling rate [how does it relate to playback quality, frequencies saved in a recording, Nyquist,
aliasing, etc.?]
the frequency with which numbers are stored. recordings are a series of discrete snapshots in rapid succession
which represents the amplitude at one given moment in time. Hz. Higher sampling rate with more samples will
give you a higher fidelity recording. Nyquist: half the sample rate. represents the highest frequency that the
recording can accurately reproduce when you play it back. the higher the sample rate the better the quality, stores
more digits per second. the lower: fits more minutes.
4. filter types [what do high or low pass or band pass or band reject filters do?]
lowpass filter: prevents aliasing, prevents higher frequencies from reaching the digitizing system so they won’t
contaminate the lower frequency recordings by being represented as an alias, deletes frequencies above the
Nyquist frequency. high: allows high frequencies to pass through, removes or attenuates lower frequencies.
band: removes low and high and allows a band in the middle to pass.
5. time vs. frequency domain displays [what’s on the axes, what do the displays show us?]
frequency domain: take the time domain wave form and do a Fourier transform to get a spectrum display.
time domain: frequency and do a Fourier transform to get a spectrum display. you can see changes in the
relative strength of the harmonics. If you raise or lower your pitch you see the harmonics spreading apart
or coming back together. noise: all sorts of frequencies present with various different phase relationships
to one another that are approx. equal in amplitude.
6. types of spectra: line, FFT, LPC [they reveal different features of speech; what is each one best suited
for?]
A pure tone has a single vertical line on a spectrum. FFT fast fourier transform: the range of harmonics that are
present in a complex sound. useful for revealing features of a sound source but not about the vocal tract filter.
LPC: linear predictive coding. shows a spectral envelope. will not show individual harmonics or details of a
sound source but will reveal what the vocal tract filter is doing, how the vocal tract shapes the sound given to it
by the larynx.
7. 3D spectrogram features [what are the three dimensions?]
Spectrogram: way to represent sound graphically. time-left to right on the x-axis. frequency going up on the
y axis. the darkness of the trace is reflective of the sound at any given frequency and at any time on the
display.

8. vocal modulation vs. perturbation [acoustic definitions; what does each one sound like alone or in
combination?]
Perturbation involves the minor imperfections found within the vocal signal. Although normal voices have
minimal perturbation voices that lack smoothness sounding hoarse or rough will have high values of
perturbation.
- Perturbation of jitter and shine that we considered a while ago occurs very rapidly from one glottal cycle
to the next.
- Perturbation cannot be measured only heard if a problem exists.
Modulation involves a tremor, unsteadiness in the voice. There will be rhythmic changes that are fairly
predictable in the fundamental frequency and in the amplitude of the voice. Modulation is measured w/
rate, how extreme, and how steady the voice is. - gradual increases and decreases that occur over the
course of many individual glottal cycles. - Is rhythmic. A voice with high perturbation would also have
issues with jitter (frequency perturbation) and shimmer (amplitude perturbation) and would sound rough
and hoarse. The voice of a person who had modulation would sound wobbly.
-can have both perturbation AND modulation.
Perturbation- hoarseness/rough, random and rapid change in either period/amplitude from cycle -to-
cycle.jitter (Freq/DURATION Perturbation) and shimmer (AMPLITUDE Perturbation) co-occur
Modulation sounds shaky - but more rythmic, slower, gradual, pattern: (FM/AM co-occur)FM=Freq
modulation, AM = Amplitude modulation BOTH FM/AM CO-OCCUR
Combined perturbation & modulation= Hoarse Voice & Shaky/Tremulous
9. direct measures vs. estimates of subglottal pressure [how can we get definite measures vs. how can
we get a reasonable estimate? what happens if we change subglottal pressure?]
Subglottal pressure is key contributor in adjusting loudness (vocal intensity). Respiratory system
Direct SubGlottal Pressure Measure (PS or PSUB)
1.Tracheal Puncture: Dr. punctures trachea, inserts mini transducer that directly measures pressure;
invasive
2. Esophageal Pressure (Balloon): Used much more in past; Transducer in balloon, swallow part way into
esophagus & sensor measures pressure on shared wall btwn trach/esophagus.
3. Estimating SubGlottal Pressure: Indirect Estimate of Intra-Oral Pressure (io): -measure pressure at
specific point/time where io pressure= subglottal pressure (measured directly below larynx). briefly
occurs during production of /p/ & vowel (bilabial plosive)
4. Oral estimating of subglottal pressure from oral pressure measurement correspond very closely w
pressure directly measured from trachea.
5. Oral air flow - when vowels more airflow and when consonant constriction the airflow will cease.
6. Wide band airflow signal very sensitive to rapid changes in airflow as vf open and close.
10.calculate average air flow [dividing volume used by time]
Volume of air that flows in given time. (Volume divided by time).
average flow= 1 liter of air and phonation lasts for 5 seconds = 1/5 liter per second or 200 cc/second or 0.2
liters/second
If phonate for 15 seconds and use 5 liters of air, then each liter has lasted 3(=15/5) seconds. So flow rate
would be 1/3 of liter/sec.

11.pressure vs. flow vs. resistance – how they relate [Ohm’s Law and the voice; what determines how
much air flows through the larynx? how can we compute an estimate of laryngeal resistance?]
Two things determine flow.
1. PRESSURE
2. LARYNGEAL RESISTANCE
control pressure by how hard we exhale or pump air w lungs. regulate resistance by how tightly adduct
vocal folds. If folds loose have breathy voice w high flow. If close tightly have more pressed vocal quality w
lower air flow
OHM'S LAW: Equation to manage flows and pressures in speech production- pressure, flow, & resistance
linearly related to one another.
E=IR - Pressure= Flow x Resistance
R=E/I - Resistance = Pressure/Flow
Describes relationship bw voltage, current & resistance.
Driving pressure: For any given amount to make voice work-higher resistance @ VF, than more tightly
adducted, and flow necesariy drops according to Ohm's law. Lower resistance for any given driving
pressure then flow will increase.
Glotal Volume velocity: volume of air flowing through glottis as function of time during phonation; AKA
transglottal airflow.
E=Voltage/pressure (pushing force in electricity)
I= Current/flow (flow of electrons through wire)
R=Resistance (amount of resisting flow of current)
Estimating laryngeal resistance
• can measure flow (w/pneumotachograph mask)
• can estimate Psub subglottic pressure (during the closure for /p/ when you measure oral pressure)
• can calculate estimated laryngeal resistance by using flow and Psub. So divide pressure measured in
mouth by flow measured in vowel and then = resistance
• Laryngeal airway resistance (Rlaw)
i. Psub (cmH2O) divided by flow (L/s)
• Pressure drops across glottis (stronger below larynx and lower above larynx.
• Difference in pressure is transglottal pressure.
• Pressure below minus pressure above.
• For a given driving pressure:
• Higher resistance means lower flow
• Lower resistance means higher flow
• Flowing air makes vocal fold move
• Disordered voice often aerodynamically different
i. Low flows in vocal hyperfunction (strained pressed voice)
ii. High flow in vocal fold paralysis = breathy (where vf don't meet at midline)
• air flow constrictions form fricatives = push airflow thru small constriction.
• flow peaks occur at stop release = when we release a stop there's a burst of air that comes out bcus
pressure has been building up behind it.
• Both at source=larynx filter= vocal tract involve management of air flow so speaking has great deal to
deal how air flows thru vocal tract.
Subglottal pressure from lungs drive voice and flow thru larynx during phonation. Resistance created by vf
adduction.

12.semitone standard deviation [how do the numbers reflect our perception of intonation in speech?]
Mean fundamental rises mean FF also rise. convert into semitones bc scaled appropriately so reflect prop
changes in intonation around certain average FF. matches human perceptual system also allows compare
like when mean FF is different amongst different individuals
-People would have similar standard deviation in semitones but not in hz
-Standard deviation in HZ hard to compare across males, females
-Semitone standard deviation (STSD) makes values comparable for high or low mean Fo.
mean Fo is what perceive as pitch. Fo variability reflects speaker's intonation. SD is measure of variability
around mean. Small SD in FO values reflect flat and monotone voice. Large SD mean that voice went above
and below average. So voice have more rising and falling pitch contours, and thus better intonation than
flat, monotone pattern.
13.source vs. filter changes [source-filter theory; know examples of a change to the source only or the
filter only]
source is laryngeal output (voice or whisper, both of which are generated by vocal folds) and filter is vocal
tract - i.e. all structures above vocal folds (pharynx, mouth, nose) that shape sound provided by larynx.
Larynx=Sound Source
Vocal Tract=Filter
Lungs=Pressure source
Filter no just remove stuff, but resonates, enhances, strengthens some of frequency components. Larynx
needs lungs to provide air pressure it needs to function. In theory, vocal tract and larynx should be able to
act independently, but interact also. In this model, pressure from lungs and interacting w larynx to generate
voicing as sound source, then sent to V tract acting as filter.
i. Loudness -if soft, provide low pressure from lungs to larynx. loud then need greater pressure to larynx. Vf
movements get bigger when louder.
ii. Pitch - can stretch vocal folds to increase tension and increase frequency at which vibrating. do this by
contracting cricoid thyroid muscle, rocks thyroid cartilage forward relative to cricoid cartilage and pulls on
the vf so become stretched.
iii. Voice quality (breathy vs tight pressed)- subtly adjusting space btwn vf specially around aretrynoids. If
breath weaker then make space larger so more air will escape btwn vf as vibrate or can press vf more
firmly for tighter sounding voice. do this increasing level of contraction in muscles of adduction. Primarily
Lateral carcoid artenoid and thyroid aretnoid.
iv. Phonation vs whispering - even if vf are not vibrating and just pushing air btwn them to cause
turbulence
-whisper - still generating sound source, involves lungs to provide pressure and vf to form constriction to
make turbulence happen
-PHONATION involves vibration of vf as oscillate in n out being driven by same pressure source from lungs.
-In theory, glottal source and vocal tract filter indep
-Fo can change (raise or lower pitch), causing harmonics change
-While tract configuration remains constant
-Tongue can move, changing filter characteristics
-While Fo remains same
-can adjust one without changing other

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COMD5070 Physiology Practice Exam With Answers (49 Solved Questions)

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