COMD 5070 final prep
Questions & Answers 100%
Correct!!
As sound travels through air, it does so as a - ANSWER-longitudinal pressure wave
The period of a sine wave - ANSWER-is shorter for higher frequency sounds
Pressure can de defined as - ANSWER-force divided by area
Intensity can be defined as - ANSWER-power per unit area
The inverse square law means that - ANSWER-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? -
ANSWER-53 dB
A power spectrum is a type of - ANSWER-frequency domain plot
Resonance occurs when - ANSWER-the applied force is at a frequency that matches the natural
frequency of an object
which of the following is an analog signal? - ANSWER-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) - ANSWER-is continuous in amplitude
is continuous in time
both of the above
a table of numbers could fully represent - ANSWER-a digital signal
you cannot listen to digital sound via digital headphones - ANSWER-because the sound is really
generated by analog loudspeakers
We can typically perceive smaller differences in the pitch of two sounds if they are - ANSWER-two
lower frequencies
The human voice as a complex tone is best described as - ANSWER-nearly periodic
quantization refers to - ANSWER-the assignment of an analog value to the nearest digital value
available
an 8-bit A/D system has how many quantization levels? - ANSWER-256
The sampling theorem indicates - ANSWER-the minimum sample rate needed to perfectly
reconstruct a signal
aliasing during digital recording means that - ANSWER-a sinusoid is transformed into a different
frequency
anti-aliasing filtering - ANSWER-removes frequency components above the Nyquist frequency
Low-pass filtering during DAC playback - ANSWER-is mandatory to eliminate the 'steps' in the analog
waveform
Questions & Answers 100%
Correct!!
As sound travels through air, it does so as a - ANSWER-longitudinal pressure wave
The period of a sine wave - ANSWER-is shorter for higher frequency sounds
Pressure can de defined as - ANSWER-force divided by area
Intensity can be defined as - ANSWER-power per unit area
The inverse square law means that - ANSWER-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? -
ANSWER-53 dB
A power spectrum is a type of - ANSWER-frequency domain plot
Resonance occurs when - ANSWER-the applied force is at a frequency that matches the natural
frequency of an object
which of the following is an analog signal? - ANSWER-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) - ANSWER-is continuous in amplitude
is continuous in time
both of the above
a table of numbers could fully represent - ANSWER-a digital signal
you cannot listen to digital sound via digital headphones - ANSWER-because the sound is really
generated by analog loudspeakers
We can typically perceive smaller differences in the pitch of two sounds if they are - ANSWER-two
lower frequencies
The human voice as a complex tone is best described as - ANSWER-nearly periodic
quantization refers to - ANSWER-the assignment of an analog value to the nearest digital value
available
an 8-bit A/D system has how many quantization levels? - ANSWER-256
The sampling theorem indicates - ANSWER-the minimum sample rate needed to perfectly
reconstruct a signal
aliasing during digital recording means that - ANSWER-a sinusoid is transformed into a different
frequency
anti-aliasing filtering - ANSWER-removes frequency components above the Nyquist frequency
Low-pass filtering during DAC playback - ANSWER-is mandatory to eliminate the 'steps' in the analog
waveform
