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COMD 5070 Week 1 questions and correct answers
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COMD 5070 Week 1 questions and correct answers
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COMD 5070 Week 1 questions and correctanswers
As sound travels through air, it does so as a - ANS longitudinal pressure wave
The period of a sine wave - ANS is shorter for higher frequency sounds
Pressure can de defined as - ANS force divided by area
Intensity can be defined as - ANS power per unit area
The inverse square law means that - ANS intensity decreases by a factor equal to the
square of the change in distance
Based on the equal loudness curves figure (2-18, p33), a 100 Hz tone would need to be
approximately how many dB in intensity to sound equally loud to a 1000 Hz tone at 40 dB? -
ANS 53 dB
We can typically perceive smaller differences in the pitch of two sounds if they are - ANS
two lower frequencies
The human voice as a complex tone is best described as - ANS nearly periodic
A power spectrum is a type of - ANS frequency domain plot
Resonance occurs when - ANS the applied force is at a frequency that matches the natural
frequency of an object
which of the following is an analog signal? - ANS speech sounds in air
musical tones in air
displacement of the middle ear bones
all of the above
an analog signal (e.g. from a microphone) - ANS is continuous in amplitude
is continuous in time
both of the above
a table of numbers could fully represent - ANS a digital signal
, you cannot listen to digital sound via digital headphones - ANS because the sound is really
generated by analog loudspeakers
quantization refers to - ANS the assignment of an analog value to the nearest digital value
available
an 8-bit A/D system has how many quantization levels? - ANS 256
The sampling theorem indicates - ANS the minimum sample rate needed to perfectly
reconstruct a signal
aliasing during digital recording means that - ANS a sinusoid is transformed into a different
frequency
anti-aliasing filtering - ANS removes frequency components above the Nyquist frequency
Low-pass filtering during DAC playback - ANS is mandatory to eliminate the 'steps' in the
analog waveform
A typical range of variation for fundamental frequency (F0) during reading passages would be
about - ANS 3 semitones
It is best to compute jitter in a voice - ANS during steady state phonation
In the research literature, the voice range profile (VRP) has also been called the - ANS
phonogram
phonetogram
F0-SPL profile
all of the above
The shape of the typical voice range profile reveals that - ANS intensity and F0 both tend
(approximately) to rise together
Direct measurement of lung pressure is achieved by - ANS puncturing the neck with a
needle below the vocal folds
Vocal efficiency may decline in some disorders because - ANS vocal fold closure tends to
be incomplete, leading to higher flow
The s/z ratio is - ANS convenient and simple, but subject to variability in performance
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